地震作用下节理岩质边坡的动力稳定性分析  

Analysis on Dynamic Stability of Jointed Rock Slope under Earthquake Action

作　　者：王泉伟[1] 杜朋召 张涛[1] 刘建磊[1] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《华北水利水电大学学报（自然科学版）》2015年第6期63-67,共5页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

摘　　要：基于离散数学的思想,将边坡离散为众多子区域,利用离散元强度折减法,以子区域特征点的位移时程曲线是否收敛作为岩体的失稳判据,研究节理岩质边坡的动力稳定性.通过分析边坡的动力响应规律,验证了由该方法确定的边坡滑面位置及安全系数是合理的.在此基础上,以某大型节理岩质边坡为例,分析了地震作用下边坡的变形破坏特征.计算结果表明,边坡的变形破坏存在浅表层动力效应,该效应在汶川震区边坡震害中多有体现.通过分析边坡浅表层动力效应的产生机理,为节理岩质边坡的防护提供一定的参考.Based on discrete mathematics,the slope is dispersed lots of sub-regions. For researching dynamic stability of jointed rock slope,strength reduction method based on DEM is applied. The equilibrium condition is estimated based on convergence property of key points＇ displacement-time curve in every sub-region. Through analyzing the laws of the slope＇s seismic response,the results show that the sliding surface position and the safety factor determined by the method are proved reasonable. To analysis the characteristics of slope deformation and failure,the method above is applied to the stability analysis of a jointed rock slope under earthquake action. The study shows that the deformation and failure of slope has a shallow surface dynamic effect,which is reflected in many slope disasters of Wenchuan earthquake region. Consequently,the analysis on the mechanism of slope＇s shallow surface dynamic effect can provide a reference for the prevention of jointed rock slope.

关 键 词：边坡工程 节理岩质边坡 地震 动力稳定性 离散元 强度折减法 

分 类 号：P642[天文地球—工程地质学]