金泉寺滑坡破坏机理及冲击强度定量分析
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西安科技大学研究生院地质与环境学院

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P642

基金项目:

国家自然科学基金(41302276)、西安科技大学博士(后)启动金项目(2015QDJ085)和国土资源部黄土地质灾害重实验室开放基金项目(KLGLAMLR201603)


Quantitative Analysis of Deformation Mechanism and Impact Intensity for the Landslide in Jin Quan Temple Mian County
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College of Geology and Environment Xi’an University of Science and Technology

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National Natural Science Foundation of China(41302276);Ph D(post) Starting gold project of Xi’an University of Science and Technology(2015QDJ085);Ministry of Land and Resources,Key Laboratory of Loess Geological Hazard,Open Fund Project(KLGLAMLR201603)

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    摘要:

    为研究单体土质滑坡破坏机理及其冲击强度,以勉县金泉寺滑坡为研究对象,采用双轴试验标定方法,得到了滑坡岩土体的细观参数,将其与岩土体室内力学实验结果对比,认为所标定的细观参数可应用到金泉寺滑坡模型中。此后基于颗粒流离散元法构建滑坡数值模型,模拟滑坡变形破坏过程,并选用冲击距离、速度、冲击力三个指标表征单体滑坡冲击强度。研究结果表明:金泉寺滑坡坡脚和后缘先发生变形,随坡体中部锁固段贯通后,整体呈现为前拉后推的复合式破坏特征;滑坡冲击距离23.82 m,最大冲击速度4.10 m/s,冲击力随冲击距离的增加而线型衰减,单位宽度最大冲击力205 kN。颗粒流离散元法模拟滑坡渐进破坏过程效果较好,同时也适用于定量分析单体滑坡冲击强度。

    Abstract:

    In order to study the failure mechanism and impact intensityof single soil landslide Taking Jin quansi landslide in Mian County as the research object, the mesoscopic parameters of rock and soil mass of the landslide were obtained by biaxial test calibration method, and the results were compared with the results of indoor mechanical test of rock and soil mass. It is considered that the calibrated meso-parameters can be applied to the model of Jin quansi landslide. Then, based on the discrete element method of particle flow, the landslide numerical model is constructed to simulate the deformation and failure process of the landslide, and the impact intensity of the single landslide is characterized by three indexes: the impact distance, the velocity and the impact force. The results show that the slope foot and rear edge of Jin quansi landslide deform first, and then the whole slope appears as a compound failure characteristic of pulling forward and pushing back after the middle locking section of the slope is penetrated. The impact distance of landslide is 23.82 m, the maximum impact velocity is 4.10 m / s, the impact force decreases linearly with the increase of impact distance, and the maximum impact force per unit width is 205 kN. The particle flow discrete element method is effective in simulating the progressive failure process of a landslide, and it is also suitable for quantitative analysis of the impact strength of a single landslide.

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引用本文

闫晓娟,赵洲. 金泉寺滑坡破坏机理及冲击强度定量分析[J]. 科学技术与工程, 2019, 19(22): 76-84.
YAN Xiaojuan, Zhao Zhou. Quantitative Analysis of Deformation Mechanism and Impact Intensity for the Landslide in Jin Quan Temple Mian County[J]. Science Technology and Engineering,2019,19(22):76-84.

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  • 收稿日期:2018-11-09
  • 最后修改日期:2019-01-28
  • 录用日期:2019-03-21
  • 在线发布日期: 2019-08-28
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