基于离散单元法的地震高边坡拟静力稳定分析  

Pseudo-static Stability Analysis of Seismic High Slopes Based on the Discrete Element Method

作　　者：杨贵[1,2] 廖苑华 刘宇 YANG Gui;LIAO Yuanhua;LIU Yu(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Institute of Safety and Disaster Prevention Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024 [2]河海大学安全与防灾工程研究所,南京210024

出　　处：《河南科学》2025年第2期250-256,共7页Henan Science

基　　金：国家自然科学基金项目(51479059)。

摘　　要：随着高边坡工程的建设日益增多,高地震烈度区边坡稳定性问题越来越受到工程重视。提出了模拟地震作用的拟静力分析方法,以某露天矿工程的高边坡为例,基于离散元法开展了地震作用下高边坡的破坏形式及滑动范围的研究。提出了临界滑移距离这一概念,基于此开展了临界滑移距离、峰值加速度和颗粒摩擦系数对破坏形态和滑动范围影响的研究。结果表明:土颗粒的滑动范围随着临界滑移距离的增大呈现出非线性增大的形态,当临界滑移距离超过3倍颗粒直径时,土体滑动范围变化较小;边坡滑动范围随着峰值加速度的增加而增大,边坡的滑动是先在每一级台阶产生,再逐步从单台阶的滑动连成一片最后发展至深部形成大范围的连体的滑动;边坡滑动范围、滑动位移和计算时长随着摩擦系数的减小而增大,当临界滑移距离超过2倍颗粒直径后,边坡的滑动范围变化不明显。在数值模拟过程中若只考虑边坡土体的滑动范围,可适当提高滑动土体的摩擦系数以此来有效降低计算时间。With the increasing construction of high slope projects,especially the slope stability problem in the high seismic intensity zone is getting more and more attention from the engineering.A pseudo-static analysis method simulating seismic action is proposed,and the research on the damage form and sliding range of high slopes under seismic action is carried out based on the discrete element method,taking the high slope of an open-pit mine project as an example.The concept of critical slip distance is proposed,and the seismic inertia force acting on the particles is deleted when the relative movement distance of the particles is larger than this distance.Based on this,the study of the effect of critical slip distance,peak acceleration and particle friction coefficient on the damage form and sliding range is carried out.The results show that the sliding range of soil particles shows a nonlinear increase trend with the increase of critical slip distance.When the critical slip distance exceeds three times of the particle diameter,the change of sliding range of the soil is small.The sliding range of the slope increases with the increase of peak acceleration,and the sliding of the slope is generated at each step first,and then gradually develops from the sliding of the single step into a single piece to form a large scale of connected sliding in the depth.The sliding range,sliding displacement and calculation time increase with the decrease of the friction coefficient,and the sliding range of the slope does not change obviously when the critical sliding distance exceeds two times of the particle diameter.If only the sliding range of the soil body is considered in the numerical simulation process,the friction coefficient ofthe sliding soil body can be increased to reduce the calculation time effectively.

关 键 词：高边坡 边坡稳定 颗粒流 拟静力法 地震作用 

分 类 号：TU43[建筑科学—岩土工程]