岩质高边坡动力稳定性评价方法与应用

Application of the Method for Seismic Stability of High Rock Slope

以上海地区天马山采石深坑岩质高边坡为研究对象,围绕岩质高边坡工程中的动力抗滑稳定性问题,通过室内试验和现场试验,对影响岩质高边坡稳定性的地质构造、场地工程条件等内在因素进行分析.采用有限元动力分析法对高边坡在地震载荷作用下的动力响应特性进行分析,探讨地震荷载作用下,影响岩质高边坡稳定性的因素、地震荷载与岩质高边坡失稳破坏之间的关系,并采用动力有限元法与强度折减法相结合的方法进行动力抗滑稳定性研究.结果表明:地震荷载作用下的水平推力对深坑酒店的稳定性影响很大,边坡顶部岩体存在向坑内整体倾覆的危险;边坡动力失稳及动力安全系数的确立可采用位移突变的方法.

A high rock slope,which is beside a stone-pit at the foot of Tianma hill in Shanghai,is taken as the research object.Surrounding the issue of dynamic stability of high rock slope in engineering and according to the results of laboratory and field tests,the interior factors influencing the stability of high rock slope were discussed,such as geological structure and site condition.Based on this,dynamic finite element method（FEM） analysis for the response of high rock slope under the earthquake will help to confirm the relationship between seismic load and the stability for slope.Combining dynamic FEM with shear strength reduction the dynamic integrity stability for the slope was studied.The results show that the horizontal thrust created by seismic load has significant impact on the stability for slope,which will make rock mass on the top be in danger of toppling into the pit.Meanwhile,the global safety factor and dynamic instability of the slope can be established by mutational displacement method.