金泉寺滑坡破坏机理及冲击强度定量分析  

Deformation Mechanism and Impact Intensity for the Landslide in Jinquan Temple,Mian County

作　　者：闫晓娟 赵洲[1] YAN Xiao-juan;ZHAO Zhou(College of Geology and Environment,Xi an University of Science and Technology,Xi an 710054,China)

机构地区：[1]西安科技大学地质与环境学院

出　　处：《科学技术与工程》2019年第22期76-84,共9页Science Technology and Engineering

基　　金：国家自然科学基金(41302276);西安科技大学博士(后)启动金(2015QDJ085)资助

摘　　要：为了对滑坡冲击强度进行定量预测,以勉县金泉寺滑坡为研究对象,基于颗粒流离散元方法,结合对滑坡岩土体细观参数的双轴试验标定,构建了滑坡数值模型,对滑坡的变形破坏机理及其动力学过程进行了分析,选用冲击距离、冲击速度、冲击力3个指标对滑坡的冲击强度大小进行了定量预测.研究结果表明:金泉寺滑坡坡脚和滑坡后缘首先发生变形,然后滑坡坡体中部的锁固段发生贯通,并最终表现为前拉后推的复合式破坏特征;滑坡最大冲击距离为23.52 m,最大冲击速度为4.10 m/s,单位宽度最大冲击力为205 kN.相关结论与利用已有研究方法分析所得结论较为一致,认为滑坡运动过程中滑体内部颗粒碰撞及摩擦耗能对滑坡冲击强度的影响不可忽略.研究方法及成果对堆积层滑坡动力学过程分析及其风险定量评估研究具有重要的参考意义.In order to the quantitative study and predict for the landslide impact intensity,by taking Jinquan Temple 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.Then,based on the discrete element method of particle flow,the landslide numerical model was constructed to simulate the deformation and failure process of the landslide,and the impact intensity of the single landslide was characterized by the impact distance,the velocity and the impact force.The results show that the slope foot and rear edge of Jinquan Temple 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 23.52 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,some conclusions are in good agreement with those obtained by using existing research methods.It is considered that the influence of particle collision and friction energy can not be ignored in the process of landslide movement.The research methods and results have important reference significance for kinetic analysis and quantitative risk assessment of landslide.

关 键 词：滑坡 破坏机理 冲击强度 定量预测 

分 类 号：P642[天文地球—工程地质学]