最新刊期
卷 41 ， 期 3 ， 2009
- 摘要：Abstract:During the Wenchuan huge earthquake in Sichuan on 12 May 2008, major of hydroelectric projects run well except that some in the epicenter were destroyed to some extend. By the analysis of the region geology stability and aseismatic safety of huge dams of the cascade hydroelectric power stations on the lower Jinsha River, the results show that all of the four stations stand on the relatively stable block, and the aseismatic safety of the dams meet the requirement of the national specifications and codes.关键词：Jinsha River, Hydroelectric Power station, Aseismatic Design, Safety
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发布时间：2023-11-28 - 摘要：Abstract:Wenchuan Ms 8.0 great earthquake of May 12, 2008 was characterized by thrust and strike-slip motions in Longmen Shan.In order to use the data of Wenchuan earthquake rapidly and properly and to take the seismogeology to a new platform,the following topics were stated which induced the basic facts and research progress in Longmen Shan which focus on the geological setting and active tectonics in the region,the basic characters and surface rupture types of the earthquake, the periodicity of historical earthquakes in the region, the accumulations and integrating of survey data, the mechanics of tectonics and kinematics,the geological hazards and reconstruction and the prediction of potential earthquakes in the future. For relieving or avoiding the similar disasters it was suggested that a synthesized research including geology,geophysics and geochemistry should be taken into the schedule to benefit the seismic sciences.关键词：Wenchuan earthquake;surface rupture;historical earthquake;active tectonics;geological hazards;earthquake periodicity;earthquake prediction;Longmen Shan seismic belt;eastern margin of Qinghai Tibetan Plateau
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发布时间：2023-11-28 - 摘要：Abstract:Historical earthquakes were one of main dynamic factors for river sediment yield in Chuanjiang catchment,and Wenchuan earthquake in 2008 will further affect its soil erosion, and the trend of river sediment and fluvial processes.Wenchuan earthquake is the largest earthquake in Longmen Mountain area as recorded in the historic documents. The earthquake has changed erosion condition and resources of sediment owing to abundant incompact mass induced dilapidations, landslips, debris flows and barrier lakes. The earthquake has damaged erosion control instructures developed in recent 20 years, and cause more serious erosion. Advances of relative science and technology studies were summarized,which included the relationships between earthquake and catchment sediment yield；sediment amount of rivers in earthquake area；Effects of earthquake to fluvial processes of Chuanjiang water system; River restoration techniques to secondary disasters of earthquakes. It was suggested that further studies are especially required, including strengthen inter disciplines studies in areas of hydraulic engineering, geo science, and ecologic and environmental science to explore theory and key techniques of river restoration after earthquake secondary disasters.关键词：Wenchuan earthquake;Chuanjiang catchment;river sedinment;fluvial processes;river restoration
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发布时间：2023-11-28 - 摘要：Abstract:On 12 May 2008, a devastating mega earthquake of magnitude 8.0 struck the Wenchuan area, northwestern Sichuan province, China. Wenchuan earthquake with Seismic has intensity 11 inevitably impaired the stability of mountains in the course of massive reverse thrust strike slip motion in the fault zone. Geohazards approaching of about 20 thousands were triggered with the types of rock fall, rock avalanches, landslides, debris flows, and earthquake lakes. The features of the debris dams were examined using the 124 breadth of ADS40 images obtained by airplane during 15 to 28 May 2008, which figured out the 256 dammed lakes with the features of distributing along ruptured zone and river channel. The farther analysis found that the number of dammed lakes reduce with the increase of distance to rupture and obey exponential relation with the correlation coefficient of 0.9699. According to the investigation data, a quick risk evaluation on the potential of outburst of dammed lakes was performed using the indices of material composition of dam, dam height, and water storage capacity of the dam. The dammed lakes were classified as extremely high risk, high risk, medium risk and low risk. The failure risk of 21 debris dams were evaluated according to the indices as 1 with an extremely high danger risk, 7 with a high danger, 5 with a medium danger and 8 of low danger. The risk evaluation result was totally accepted by state earthquake disaster relief office. And emergency dam treatment for risk reduction was planned based on the assessment which was carried out in successful. The earthquake destroyed the stability of the slopes and produced numerous loose soil and debris in tributaries, which resulting in a prolonged geo hazards for the area. Landslides and debris flows will continue to develop for at least five to ten years after the Wenchuan earthquake and will cause additional dammed lakes. After then, the probability of dammed lake formation will go down as less activation of landslides and debris-flows.关键词：Wenhuan Earthquake;dammed lake/quake lake;landslide;debris flow;risk evaluation
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发布时间：2023-11-28 -
The Emergency Responses to Damaged Reservoirs and its Reconstruction after Wenchuan Great Earthquake
摘要：Abstract:May 12th Wenchuan Great Earthquake has totally caused 1997 damaged reservoirs to different extents in the Sichuan Province. The damage type mainly includes: cracks,inside collapse,leakage in the reservoir area,and Water discharge facilities damage. In this paper, firstly the damaged situations of damaged reservoirs and the impact range was demonstrated. Then, based on the study of the characters of earthquake damaged reservoirs, some detailed suggestions and effective way of emergency management and reconstruction were put forward,by which we can lower economic loss and secondary disaster caused by earthquake damaged reservoirs as great as possible. Through the past ten months’ hard efforts for reconstructing the damaged reservoir, 42 reservoirs have been repaired and stage achievements has been reached.关键词：great earthquake;damaged reservoir;emergency responses of collapse accidents;reconstruction after the disaster- 2519
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发布时间：2023-11-28 - 摘要：Abstract:The stability of slopes in earthquake disaster areas has not only been largely decreased by“5·12”Wenchuan earthquake, but also a large number of geological hazards such as landslides and so on, have been induced in the areas. On the basis of thoroughly surveying on the landslides induced by the earthquake in the disaster areas, basic characteristics of the typical landslides was summarized. Taking the Donghekou landslide of Qingchuan county as an example, basic characteristics and deformation failure mode of the large scale landslide was analyzed and discussed. The results showed that the landslide belongs to high speed and long distance slope movement in the action of intense earthquake. The movement stage can be approximately separated into three stages of sliding in setting out, flying and colliding of short distance, and flowing of long distance. The destabilization failure mode can be simply generalized into tension→crack extended, running through→slope instability and fiying off→landslide disaggregation, flowing→deposit.关键词：Wenchuan earthquake;large-scale earthquake-induced landslide;basic characteristics;destabilization failure mode
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发布时间：2023-11-28 - 摘要：Abstract:The oil-pipe from LANZHOU to CHONGQING was the only pipe that translates product oil to the Western areas. It supplied more than 70% product oil of SICHUAN and CHONGQING. It was an important artery to the western exploitation; therefore its running safety was especially significant. The earthquake of May 12 in WENCHUAN triggered a great many of slides and landslides to shape lots of large scale barrier lakes. The Tangjiashan Barrier Lake, located in the upper stream of Beichuan county, Mianyang of Sichuan province, is one of the largest scales of the barrier lakes. Once the dam breaks, it is not only threatening the safety of infrastructural facilities, cities, pathways, e.g., and the residents, but also threatening the oil-pipe. To insure the safety of the oil-pipe during the sluice of Tangjiashan Barrier Lake, calculated the erosion depth of the FU river cross section under the three possible dam-break types. Based on the results, the erosion depth of groove is 6m and of beach is 4m under the 2/3 dam-break, while it’s 8m and 6m separately under the whole dam-break. Estimated the safety and then bring forward the corresponding lash-up measures so that guaranteed the safety of the pipe during the rapid flood of Tangjiashan Barrier Lake..关键词：oil-pipe from LANZHOU to CHONGQING;Tangjiashan Barrier Lake;erosion;safety estimation
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发布时间：2023-11-28 - 摘要：Abstract:Study on the Incipient Velocity of Tangjiashan Barrier Lake Downstream Area Sedimen关键词：Tangjiashan Barrier Lake;incipient velocity;uniform sediment;non horizontal slope;horizontal slope
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发布时间：2023-11-28 - 摘要：Abstract:Earthquake may trigger Landslide Lake,which is a great threat to the residents living downstream.Using high speed photography cooperated with positioning a group of labeled stakes,a set of test method was established and the whole process from erosion along the line to headcutting,the dam break characteristics of flood and landslide dam’s shape can be studied by this method.Experimental observation indicated that during landslide lake’s releasing period, the change of the channel shape is a gradual process,the erosion in the bottom is a headcutting process in the longitudinal orientation, both sides show gradual collapse process in the lateral orientation.With the experiment going on,scouring coefficient changes from large to small; from front to back of the landslide dam’s model,scouring coefficient changes from large to small.Breach is extending and alluvial fan become bigger and it extends towards both sides and ahead,at last discharge channel extends from breach to both sides,deepens in behind and finally forms an irregular trapeziform.关键词：landslide lake;survey method with stakes;change of burst orifice;scouring coefficient;headcutting
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发布时间：2023-11-28 - 摘要：Abstract:Wenchuan earthquake caused hundreds of earthquake lakes with a block height over 10 m, water storage over 1.0×105 m3 and a catchment area more than 20 km2. Different types of earthquake lakes are required corresponding disposal approaches, depending on different hazard degree to downstream, conditions of geology, geomorphology and hydrology, and scale and particle sizes of block body. Based on the risk elimination practice on earthquake lakes,at the Tangjiashan in Beichuan County, Laohuyzui in Dujiangyan city,the risk elimination techniques, protection and integrated management of earthquake lakes were discussed. The key techniques applied in the risk elimination of Quake lakes, including site survey, risk assessment, design of discharge sluice channel, selection of construction method and equipments as well as post emergency disposal evaluation, were summarized.关键词：Wenchuan earthquake;Landslide Lakes;risk elimination techniques;management
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发布时间：2023-11-28 - 摘要：Abstract:5.12 Wenchuan earthquake triggered a large number of direct and secondary geological disasters, which caused a grave threat on human life and property, as a result of the barrier lake caused by the earthquake is a typical secondary geological disasters. Combination of Dujiangyan City, Baisha River no-man's land of the three barrier lake(Jiadanwan, Yaozigou and Guanmenshan) site engineering geological findings and regional engineering geological conditions, the formation of the barrier lake processes and the status of correlation analysis, its shows that: barrier lake are a result of the earthquake triggered landslides walling up river, due to landslide volume is huge, and quickly dashed from the side to the other side of the valley, creating a high-side and a other low side of barrier lake. And then the seepage stability of barrier lake dam and the slope stability of reservoir banks are analyses, combined with the scene emergency treatment measures of the barrier lake, some recommendations deal with Baisha River no-man's land of the three barrier lake are put forward.关键词：engineering geology;5.12 Wenchuan earthquake;engineering geomechanics;geological hazards;barrier lake;safety evaluation
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发布时间：2023-11-28 - 摘要：Abstract:At 14:28， May 12th 2008，a strong earthquake measured Ms 8.0 hit west Sichuan province，PR China. Based on field reconnaissance，a brief introduction to the geology and fault patterns in Yingxiu and Hongkou area was introduced.The surface ruptures，and its relation with fault patterns，which post quake reconstruction have to face with，were described and discussed.关键词：Wenchuan earthquake;surface ruptures;Yingxiu;Hongkou
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发布时间：2023-11-28 - 摘要：Abstract:A large number of seismic landslides have been induced by Wenchuan Earthquake, among which a universal seismic landslide type was fragmentation-sliding seismic landslide, with the unique sliding characteristics and complexity of power mechanism. In order to study the development characteristics of this kind of seismic landslide,Niujuan Ditch seismic landslide in Yingxiu of Wenchuan County was used as a typical example. Initially,the critical control factors of the formation for the fragmentation-sliding such as landforms, litho logy, slope structure, the role of seismic were studied. Then a detailed interpretation of the process of fragmentation sliding with four stages and 7 turning points of the direction—“slide to start collision fragments debris slide the accumulation of stagnant” were given.The application of the mechanism—“seismic start fragmentation accelerating” has an efficient explanation for why there are features of ultra-high-speed, slip away-way, large-scale for seismic landslide, which will be a typical and academic significance.
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发布时间：2023-11-28 - 摘要：Abstract:The Wenchuan earthquake on May 12, 2008 has induced many secondary disasters, such as collapses, landslides, dammed lakes, and a great area of loose soils and rocks. The debris flows of larger scales may occur at the stimulus of rainstorms that would cause events of ordinary scales before the quake. Based on the analysis of historic debris flows following the earthquakes and the debris flows in 2008, the optimal opportunity of controlling the potential debris flows was considered. The results indicated that the control measures should be taken three to five years later in the central quake hit areas. In other affected areas the engineering structures can be extensively made. It is suggested that the projects on the debris flows mitigation works in the most severe areas should be postponed up to three to five years.关键词：Wenchuan earthquake;debris flow;control works;optimal timing
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发布时间：2023-11-28 - 摘要：Abstract:“5·12” Wenchun Earthquake resulted in large numbers of geo hazards along Dujiangyan Wenchuan Highway located in the zone of extreme quake areas. After this earthquake, most of valleys have favorable conditions for debris flow occurrence and are very active in the future 10~20 years, especially the beginning 5years after this earthquake. This paper mainly discussed and assessed the hazard levels of debris flow valleys based on the data of field investigation and high resolution remote sense image identification. The hazard assessment model for single debris flow valley was established using valley slope gradient and debris flow magnitude,and 29 debris flow valleys were assessed by this model and classified into 4 hazard levels of extreme hazard, high hazard, middle hazard and gentle hazard. The assessment result showed that most of debris flow valleys were in and over middle hazard level, occupied 79.31% and the valleys of extreme hazard level accounted for 20.7%. The most hazard valleys were Guozhupu valley, Manianping valley, Yeniu valley, Yiwanshui valley and Gaodianzi valley, and then were Xinqiao valley, Qinjin valley, Fendan valley and Cili valley. These valleys should be pay specific attention and make effective measures to predict, evade and prevent debris flow in the earthquake reconstruction projects.关键词：debris flow valley;hazard assessment;debris flow magnitude;valley floor gradient;Dujiangyang-Wenchuan Highway
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发布时间：2023-11-28 - 摘要：Abstract:Wenchuan Earthquake caused many reservoirs damaged. According to the basic situation of earthquake-damaged reservoirs in Sichuan province,the Hongqi reservoir in Cangxi county was taken as a typical earth rockfilled dam example for renovation analysis. Before renovation, the minimum safety factors against sliding of dam slope were only 1.098 ~ 1.145,less than the specification required values ( 1.15 ~ 1.25), as the water level dropped from exceptional flood level, design flood level and normal water level to dead water level. Through treatment and reinforcement, the values improved to 1.262 ~ 1.698 and met the requirements of specification. Finally, seismic resistance analysis was carried out to study the stability of the dam slope after renovation, and the seismic safety factors were 1.451 ~ 1.654 which met the specification requirements. The results of the statistical data and the renovation of a typical earth rockfilled dam provided a reference for other similar earthquake-damaged reservoir.关键词：earthquake-damaged reservoir;earth-rockfilled dam;renovation;seismic resistance analysis
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发布时间：2023-11-28 - 摘要：Abstract: Yele dam is a rockfill dam with an asphaltic concrete core. The maximum dam height is 124.5 m, and the geological conditions of its foundation are complex. The dam area with an epicentral distance of about 258 km was shocked strongly during Wenchuan Earthquake, and the monitoring station on the dam obtained records of the main earthquake. The 3D FEM nonlinear dynamic analysis was adopted to analyze the seismic response of the dam .And the recorded accelerogram on the bedrock was used as the input earthquake motion, by which the peak acceleration was 11.968 gal and the duration was 124.4 s. The analysis results were in good agreement with the actual seismic records, which were different from the common rockfill dam. The seismic response of the dam increased gradually from the left bank to the right bank, and the response in the longitudinal direction was comparatively large. The peculiar features of the dam’s seismic response were closely related to the special geological condition that the foundation of the dam was unsymmetrical seriously in the both bank.关键词：Wenchuan Earthquake, Yele Dam, asphaltic concrete core, rockfill dam, seismic response
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发布时间：2023-11-28 - 摘要：Abstract:Debris flow velocity can be calculated through the dynamic and potential energy or the relationship between line speed and radius as the debris flow moving in a bend channel. A practical formula of super elevation in bend based on the theory of unequal angle speeds and hydromechanics was put forwars. The bend bed roughness parameter can be gotten through velocities and experiential theories. The velocities of straight channels also can be gotten by the roughness parameter. The calculation of Tonggeding debris flow velocity and its distribution showed that the results by two models above are very close. Indeed for the “unequal velocity model”, the calculated mud line distributed with a parabola shape, which is more close to the reality. The velocity from “unequal velocity model” is a little lower than that of calculated by “equal velocity model”关键词：super elevation in bend;debris flow;velocity;roughness parameter
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发布时间：2023-11-28 - 摘要：Abstract:Many school buildings suffered severe damage or even collapsed totally during M8.0 Wenchuan Earthquake on May 12. Destroyed or collapsed school buildings killed lots of students and teachers. Following the earthquake, a reconnaissance team was dispatched to epicenter region to learn firsthand about the performance of the civil infrastructure, especially about the school building. The performance of masonry structure, masonry structure with timber roof and RC frame structure were presented. Many structural or non-structural deficiencies were highlighted by the earthquake, which including: poor integrity, weak connection between components, lack of strength and rigidness of vertical bearing system, asymmetry leading to collapse laterally, poor construction quality. Reinforced masonry structure school building with precast flats had excellent performance.关键词：Wenchuan earthquake;School buildings;Damage;seismic design
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发布时间：2023-11-28 - 摘要：Abstract:A rapid visual evaluation method of quake-stricken buildings in the 2008 Panzhihua Ms 6.1 earthquake was introduced. By this method, the damage degree of different structures in disaster area were statistically analyzed. This method can give a relative reliable appraisal results compared with previous methods, but still raises the problem of the operability and consistency of different experts. It was suggested to introduce the point rating of structure hazardous failure to increase the consistency and stability of appraisal results.关键词：Panzhihua earthquake;damage investigation;damage degree;building appraisal
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发布时间：2023-11-28 - 摘要：Abstract:A huge amount of building waste was caused by collapsed houses and dilapidated buildings as a result of Wenchuan earthquake. The smooth disposal of building waste will make the post earthquake reconstruction work effective. Based on the statistics of the earthquake damage and the relationship between different building structures and building waste produced, it was indicated that masonry structures, frame structures and mixed structures between them are the main source of building waste. An initial mathematical model about the amount of building waste in the disaster area was firstly set up, then the type and the quantity of building waste were statistically analyzed from the aspects of structure,materials and damage situation. Finally, the composition and distribution characteristics of building waste in disaster area were concluded as:the main building waste is waste concrete and waste brick, and most of it comes from the masonry structures.关键词：Wenchuan earthquake;building waste;statistics;reuse;recycle
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发布时间：2023-11-28 - 摘要：Abstract:In order to treat the large waste concrecte caused by the Wenchuan Earthquake,the RC(recycled concrete) beam flexural capacity calculation formula with the recycled aggregate replacement rate was founded according to the Code for design of concrete structures. The M-φ relation curves of the RC beams were calculated by the analyses of finite element method. The results showed that the results of calculation accorded well with the results of recycled concrete beam experiments all over the world. Variance Analysis proved that these two methods are both applicable. The research supplied much valuable references for the design of RC beam.关键词：recycled concrete;flexural capacity;replacement ratio
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发布时间：2023-11-28 - 摘要：Abstract:Using a large amount of construction waste, which was generated by Wenchuan earthquake, to produce recycled concrete blocks, is an important approach to utilize construction waste as resources. Based on the application of recycled concrete blocks in the earthquake hit area, for reconstruction of villages and towns, the structural performance of recycled concrete block masonry was discussed. Under low frequency cyclic loading test of recycled concrete block load bearing walls and the full scale model shaking table test of recycled concrete block masonry house, the seismic performance of recycled concrete block masonry was studied. Combining with two demonstration projects in the earthquake hit area reconstruction, the design of recycled concrete block masonry structure was also studied.关键词：post-earthquake reconstruction;recycled concrete block;structural performance;seismic performance;structure design
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发布时间：2023-11-28 - 摘要：Abstract:The seismic performance of steel reinforced ultra high strength concrete columns (SRSHC) with various shear span ratios (λ) were studied through a series of experiments. The concrete compressive cube strength value of experimental specimens ranged from 92.9 MPa to 108.1 MPa. The main experimental variables affecting seismic performance of specimens were axial load ratio and stirrup reinforcement ratio. The columns (λ=2.75) subjected to low cyclic reversed lateral loads failed mainly in the flexural shear mode failure and columns (λ≤2.0) subjected to low cyclic reversed lateral loads failed mainly in the shear mode failure. Shear force displacement hysteretic curves and skeleton curves were drawn. Coefficient of the specimen displacement ductility was calculated. Experimental results indicate that ductility decreases with axial pressure ratio increasing, and increases with stirrup reinforcement ratio increasing. Limit values of axial pressure ratio and minimum stirrup reinforcement ratio of columns are proposed to satisfy definite ductility requirement. The suggested values provide a reference for engineering application and for the amendment of the current Chinese design code of steel reinforced concrete composite structures.
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发布时间：2023-11-28 - 摘要：Abstract:The “5·12” Wenchuan Earthquake presents two challenges—reconstruction of the devastated areas and building adequate seismic resistance into the rest of China. The stages in recovery include structural condition assessment, identification of seismic weaknesses, appreciation of the variable seismicity of PR China, the development of a seismic performance index to aid the decision to relocate, rebuild or retrofit, development and application of the principles of retrofitting which recycles rubble and waste from Wenchuan “5·12”, with an emphasis on integrating masonry construction into seismic resistance. The recovery and resilience achieved through structural engineering must be integrated into a broader community involvement in disaster risk reduction.
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发布时间：2023-11-28 - 摘要：Abstract:This paper presents two possible construction methods that could be adopted in the Wenchuan post-earthquake reconstruction. One is the composite tubular construction and the other is FRP (Fibre Reinforced Polymer) retrofitting technology. The background of these two methods, the existing research and relevance to Whenchuan post-earthquake reconstruction are described.
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发布时间：2023-11-28 - 摘要：Abstract:In 2007, over 24 million tons of Construction and Demolition (C&D) wastes were generated in Hong Kong. Since the local landfills will be saturated in about 6 years, it is important to find a viable way to reuse these waste materials as to alleviate the demand on public fill capacity. In order to tackle the problem, the Hong Kong government has set up a temporary recycling facility in Hong Kong in 2002 for producing different sizes of recycled aggregate for use in various construction materials. The Hong Kong Polytechnic University has been studying the feasible use of recycled aggregates in Hong Kong for a number of years. A substantial amount of experimental results on the properties of recycled aggregates and the effect of recycled aggregates on the properties of concrete and other construction products (e.g. concrete blocks and granular sub base) has been published. In this paper, the experience of Hong Kong in using recycled aggregates are summarized and a set of quality control guidelines proposed for governing the use of recycled aggregates in Hong Kong is introduced. The experience and guidelines may also be useful for the recycling of waste materials derived from the recent Sichuan earthquake in China.
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发布时间：2023-11-28 - 摘要：Abstract:Wenchuan Earthquake induced thousands of rock fall and collapses, with some unique kinetic characteristics of geohazard. In order to study the genetic mechanism of the geohazards induced by strong earthquake , the influence of the factors such as the direction of the seismic force , texture of the slope, shape characteristics of slopes, on the slope’ failure and discussed the main model and process of the slope’failure under strong earthquake were investigated,by the means of shakding table model test of physical modeling. The results showed that strong inertia force formed in the process of earthquake is the main reason of the slope’s distortion and failure. The strong horizontal seismic inertia force brought vertical tensional cracks which strike perpendicular to the direction of the seismic force on the top of the slope firstly. At the same time, it drived the plasmodium on the out side of the crack move along the horizontal direction, brought the tensional and shearing texture face or slip face which is horizontal or incline outside.At last the slope failed along this face.The lithology of slope and the characteristic combination of lithology, the characteristic combination of the control texture faces are the main factor of the model of slope’s distortion and failure under the strong earthquake.关键词：Wenchuan earthquake;geohazard;slopes;dynamic response;physical modeling
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发布时间：2023-11-28 - 摘要：Abstract:WenChuan Earthquake brought out large-scale and group-occurring secondary mountain hazards. They not only severely destroyed the highways and blocked the traffic, but also blocked the process of earthquake relief and reconstruction. After the remote sensing monitoring and field survey in XuanKou-Yanmen part of the DuJiangyan-WenChuan Highway, the article describes the type and the distribution of the secondary mountain hazards and analyzes the damage of the subgrades, pavements, bridges and tunnels along the DuJiangyan-WenChuan Highway. In addition, combining with the temporal characteristics of secondary mountain hazards, the article puts the countermeasure and suggestion of the relief and reconstruction of the traffic system. The research result shows that: (1)In the research region, strong earthquake causes a lot of secondary mountain hazards such as collapses, landslides, debris flows, dammed lakes. There are 3863 collapses with a total area of 68.9km2, 74 debris flow gullies, 18 landslides, 5 dammed lakes, 5 ground fissures which is longer than 1km.((2)Earthquake and secondary mountain hazards severely destroyed the highway and traffic. From XuanKou to YanMen in WenChuan, there are 299 blocks in DuJiangyan-WenChuan Highway. Also, there are barriers with a length of 23.814km. 80% of the highway, including 87 bridges and 10 tunnels, has been destroyed. (3)The distribution of the main kind of collapse, landslide, debris flow, dammed lake mainly depends on seismic intensity, geological structure, topography and geomorphology and rock characters.4) By using the technology of GIS and remote sensing, the disaster evaluation and dynamic monitoring can be effectively carried out, so it can provide the scientific basis and references to the relief and reconstruction.关键词：Wenchuan earthquake;secondary mountain hazards;Remote Sensing Monitoring;DuJiangyan-WenChuan Highway
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发布时间：2023-11-28 - 摘要：Abstract:The failure of anti-slide pile in earthquake is one important factor that aggravates the harm of mountain hazards. However, the mechanism of it and its response mechanism to seismic wave are not clear at present, and the interaction mechanism between anchor system and seismic wave can’t be resoluted. Therefore, based on energy theory, taking the upper bound theorem used in limit analysis as measure, and assuming the sliding face as arc, the safety of anchor system was defined, and then the mechanism of energy input and dissipation under earthquake was studied. Furthermore, the characters seismic wave which induces the damage of anchor system was also analyzed, and the calculating formulas were suggested. At last, an example was given to show that the failure mechanism of anti slide pile is the result of discontinuous damage accumulation under seismic load with special direction and value.关键词：seismic wave;failure of anti-slide pile;upper bound theorem;critical acceleration
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发布时间：2023-11-28 - 摘要：Abstract:Due to the May 12th Wenchuan Great Earthquake, the area of soil erosion has been enlarged, the soil erosion intensity has accelerated, the amount of soil loss has increased and the economic loss is enormous. Compared the economic loss caused by soil erosion and water loss with the major index of economic construction, the ecological economic negative effect value can be clearly exhibited, therefore providing scientific basis for the after earthquake ecological reconstruction and the managerial decision maker of soil and water conservation. At first, the jeopardy of soil erosion and water loss and the amount of soil erosion was analyzed.Secondly, the monetary economic loss caused by the jeopardy of soil erosion and water loss was evaluated and calculated by useing the fundamental principle and methods of environment economy.The whole economic loss of soil erosion of Sichuan Province arrives at RMB 50.322 billion Yuan. At last, based on the analysis results of soil erosion and water loss after quake, some countermeasures related to the recovering and reconstruction of soil and water conservation were put forward.关键词：Wenchuan earthquake;soil erosion and water loss;economic loss evaluation;Sichuan province;recovering countermeasures
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发布时间：2023-11-28 - 摘要：Abstract:Resources and environment bearing capacity evaluation is a significant part of the state planning for post—Wenchuan earthquake restoration and reconstruction. The paper introduces a evaluating method based on water resource、environmental capacity and land resource. After analyzes the changing trend of resources and environment after Wenchuan earthquake, the evaluating method has been applied to calculates the population bearing capacity of resources and environment of 10 counties in area hited by Wenchuan earthquake. It is concluded that the population bearing capacity based on resources and environment in area hited by Wenchuan earthquake in 2010 is 132.5－140 million. For meeting well-off standard the population bearing capacity in 2020 is 99.5-106.5 million. It takes the in-situ reconstruction as the key point for post—Wenchuan earthquake restoration and reconstruction, without immigrates massively. The paper discusses the counter measures of solving conflict of the man－land relationship. The evaluation provides a cogent support to the reconstruction planning and plays an utmost important role in improving the scientificalness of planning and decision—making．
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发布时间：2023-11-28 - 摘要：Abstract:Recycled aggregate concrete is a kind of new material which recycles waste concrete with the significant advantages of environmental protection and economic benefit, as a main measurement to realize the sustainable development of construction, resource and environment. Especially after Wenchuan earthquake, tons of construction waste have been produced with the amount far surpass the annual production of construction waste in China, resulting in a great challenge of reconstruction to the quake area. In this paper, the basic properties of recycled aggregate concrete and its application performances in structures are presented according to the current research achievements from home and abroad. Meanwhile, the mechanical performances of recycled aggregate concrete-filled steel tubes and the application outlook of recycled aggregate concrete used in steel tube composite structures are discussed taking the superiorities of composite structure into account. Furthermore, the necessity and feasibility to promote the research and application of recycled aggregate concrete during the post-earthquake reconstruction in China are proposed.关键词：post-earthquake reconstruction;recycled aggregate concrete;steel tube filled with RAC
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发布时间：2023-11-28
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