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工程科学与技术:2024,56(1):117-126
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泸定地震诱发灾害特征分析
(1.四川大学 山区河流保护与治理全国重点实验室 地质工程与地质灾害研究所,四川 成都 610065;2.四川省地震局,四川 成都 610041;3.上海市地震局,上海 200062;4.成都理工大学 地质科学学院,四川 成都 610059)
Characterization Analysis of Triggered Disasters in the Luding Earthquake
(1.Inst. of Geo-Eng and Geohazards, State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China;2.Sichuan Earthquake Administration, Chengdu 610041, China;3.Shanghai Earthquake Agency, Shanghai 200062, China;4.College of Earth Sci., Chengdu Univ. of Technol., Chengdu 610059, China)
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投稿时间:2022-11-10    
中文摘要: 2022年9月5日,四川省泸定县海螺沟景区发生6.8级地震,震中烈度Ⅸ度。相较于2008年汶川8级地震和2013年芦山7级地震,此次地震震级要小,但是地震区为山区,地质灾害发育,造成交通中断、118人死亡或失踪。为探究泸定地震损失情况,作者对泸定县和石棉县的主要地震影响区进行了为期5 d的考察。基于考察成果和区域地质资料,对地质灾害孕育、建筑结构震损和人员伤亡情况进行了分析,以期为灾后重建提供参考。主要结论如下:1)地质灾害的上盘效应不突出,灾害主要分布于烈度Ⅶ度及其以上地区,规模小,以崩塌或落石和浅层滑坡为主,偶见基岩平面滑动和土体圆弧形滑动。2)地质灾害形式受地质条件控制。泸定县得妥镇以上为干热河谷,山坡卸荷较强,风化程度低,主要灾害形式为落石;得妥镇以下降雨量相对较大,山坡卸荷、风化严重,主要灾害形式为浅层滑坡。3)地质灾害主要出现在山脊、陡缓坡交接部位、侵蚀沟槽两壁,以及公路沿线。工程扰动是地质灾害密集分布和人员伤亡的促发因素。4)建筑结构震损主要出现在Ⅸ度烈度区,以磨西镇的震损最为严重。农村自建房屋和老旧建筑施工质量是影响结构抗震能力的主要问题,灾后重建房屋选址需要考虑场地效应影响。5)在高山峡谷地区,公路边坡加固和建筑结构避开落石影响区是降低地震伤亡率的有效措施。
Abstract:In September 5th 2022, an earthquake measured Ms 6.8 occurred in Hailuogou scenic spot, Luding County, Sichuan Province, and its intensity at epicenter is Ⅸ. Compared with Wenchuan earthquake (Ms 8.0) in 2008 and Lushan earthquake (Ms 7.0) in 2013, its magnitude is smaller. However due to the mountainous topography, the earthquake-triggered geological disasters are highly developed, obstructed traffic lines and caused 118 persons dead or missing. In order to investigate the earthquake-triggered disasters and loss, a 5-days field visit is taken to the affected area of Luding County and Shimian County. Based on the collected data and regional geological information, the analysis is conducted to formulate the development of geological disaster, the damage of civil structures and human fatalities. The major findings can be summarized as follow. 1) The hanging-wall effects of geological disasters are not obvious, which mainly occur in the areas with earthquake intensity of more than Ⅶ, and are small in volume and can be categorized mainly as rock fall and gravel/sand/debris slide. The rock planar slide and soil slump can be occasionally witnessed. 2) The landslide types are controlled by geological conditions. The upstream Detuo town in Luding County belongs to the Dadu river valley which is hot and arid, where the slope mass is highly loosened but slightly weathered, and the disaster type is mainly rock fall. However, downstream of the town, the valley is humid, the slope mass is both highly loosened and weathered, and gravel/sand/debris slide is the major failure type. 3) Geological disasters appear mainly in the areas of mountain ridge, intersection of gentle and steep slope, the walls of an erosion gully and highway lines. Engineering disturbance is an enhancing factor for the dense distribution of disasters and human fatalities. 4) Damage of civil structures mainly occurred in the areas with intensity of Ⅸ and is most serious in Moxi town. The construction quality of rural self-built houses and old buildings is the main problem affecting the anti-seismic capacity of the structures. The seismic site effect should be considered during post-quake reconstruction. 5) In the region of alpine and deep valley, it is effective to reinforce highway slope and to keep a building site away from the affected zone of possible rock falls, thus to reduce disasters and human fatality.
文章编号:202201236     中图分类号:P642    文献标志码:
基金项目:国家自然科学基金区域创新发展联合基金项目(U22A20601);第二次青藏高原综合科学考察研究专题(2019QZKK0905)
作者简介:第一作者:邓建辉(1965-),男,教授,博士.研究方向:岩石工程与地质灾害.E-mail:jhdeng@scu.edu.cn;通信作者:戴仕贵,E-mail:Daishigui2022@126.com
引用文本:
邓建辉,韦晓,戴仕贵,邓辉.泸定地震诱发灾害特征分析[J].工程科学与技术,2024,56(1):117-126.
DENG Jianhui,WEI Xiao,DAI Shigui,DENG Hui.Characterization Analysis of Triggered Disasters in the Luding Earthquake[J].Advanced Engineering Sciences,2024,56(1):117-126.