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工程科学与技术:2020,52(6):40-48
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基于流形元模型的高速远程滑坡碎屑流运动规律与拦挡结构减灾效果研究
(1.武汉大学 土木建筑工程学院 岩土与结构工程安全湖北省重点实验室,湖北 武汉 430072;2.武汉大学 水工岩石力学教育部重点实验室,湖北 武汉 430072)
Simulation of Movement of High-speed and Long Run-out Landslide Rock Avalanche and the Disaster Reduction Effects of Retaining-wall Based on the Numerical Manifold Modelling
(1.Hubei Provincial Key Lab. of Safety for Geotechnical and Structural Eng., School of Civil Eng., Wuhan Univ., Wuhan 430072, China;2.Rock Mechanics in Hydraulic Structural Eng., Ministry of Education, Wuhan Univ., Wuhan 430072, China)
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投稿时间:2020-03-21    修订日期:2020-05-08
中文摘要: 高速远程滑坡碎屑流具有极高的动能和超远移动距离,是一种危害范围广、破坏力极大的地质灾害。为完善高速远程滑坡减灾体系,研究碎屑流拦挡结构的减灾作用,采用数值流形方法对牛圈沟强震诱发滑坡所形成的高速碎屑流运动过程进行模拟,分析其堆积状态及运动特性。通过数值试验研究了碎屑流运动路径上植被覆盖、拦挡墙高度、位置及布置方式对高速远程滑坡碎屑流堆积状态的影响,并对拦挡墙的减灾作用进行评价。模拟结果表明:尽管在碎屑流运动路径上增加植被覆盖可降低碎屑流运动距离,为达到更好的拦截碎屑流的效果,仍需在运动路径上布置拦挡墙,以有效降低碎屑流的沿程位移及远程堆积量;当拦挡墙布置于不同位置时,对滑坡碎屑流有不同的截流阻滑作用,并确定了拦挡墙的最优位置;相对于增加拦挡墙高度,设置多排拦挡墙可更加有效地拦截碎屑流,以减少对下游的危害。
Abstract:The high-speed and long run-out landslide debris flow is characterized by high kinetic energy and long moving distance, which is a kind of geological disaster with a wide range of damage and great destructive power and leads to enormous loss to human beings. Numerical simulation provides an important method to study the effects. In this paper, the numerical manifold method was used to simulate the movement process of high-speed and long run-out landslide debris flow induced by strong earthquake in Niuquangou, China. The accumulation state and movement characteristics of the landslide debris flow were studied through a series of numerical tests. The effects of vegetation coverage, spatial characteristics of retaining-wall on the accumulation state of debris flow were studied, and the disaster reduction effects of retaining-wall was evaluated. The simulation results showed that the effects of increasing vegetation coverage on the landslide movement path was limited. In order to intercept landslide debris flow better, the retaining-wall should be arranged on the motion path to effectively reduce moving distance and long-distance accumulation of debris flow. When the retaining-wall was placed in different positions, it would have different effect on the landslide debris flow, and the optimal position of the retaining-wall was determined. In addition, compared with effects of increasing the height of the retaining-wall, the multiple rows of retaining-wall structure can more effectively intercept the debris flow and reduce its harm to the downstream.
文章编号:202000213     中图分类号:    文献标志码:
基金项目:国家重点研发计划项目(2018YFC1505005);中央高校基本科研业务费专项资金项目(2042018kf0028);湖北省自然科学基金项目(2016CFA083)
作者简介:郜颖超(1995-),女,博士生.研究方向:边坡灾害预测理论与防控.E-mail:ycG1995@whu.edu.cn
引用文本:
郜颖超,位伟,姜清辉.基于流形元模型的高速远程滑坡碎屑流运动规律与拦挡结构减灾效果研究[J].工程科学与技术,2020,52(6):40-48.
GAO Yingchao,WEI Wei,JIANG Qinghui.Simulation of Movement of High-speed and Long Run-out Landslide Rock Avalanche and the Disaster Reduction Effects of Retaining-wall Based on the Numerical Manifold Modelling[J].Advanced Engineering Sciences,2020,52(6):40-48.