软弱结构面参数对顺层岩质边坡动力响应的影响研究

Influence of weak structural plane parameters on the dynamic response of rock slope

为了探究地震作用下软弱结构面对岩质边坡动力响应特征的影响。以云南省某露天矿山边坡为研究背景,利用有限差分软件中的非线性动力分析法对顺层岩质边坡进行动力计算,通过控制变量法设计了一系列的数值实验,探究了软弱结构面参数的改变对岩质边坡动力响应的影响规律,再基于正交试验以及极差分析法对影响岩质边坡动力响应的结构面参数进行了敏感性分析。结果表明:结构面参数的改变对于顺层边坡的动力响应有较大影响;各影响因子对顺层岩质边坡动力响应影响程度大小排序为结构面黏聚力>结构面倾角>结构面内摩擦角>结构面厚度。动力响应的研究可为地处地震频发区域的顺层岩质边坡提供抗震依据。

In order to explore the influence of weak structural plane parameters on the dynamic response characteristics of slope under earthquake action.In this paper,the slope of an open-pit mine in Yunnan province is taken as the research background.The finite difference software is used to simulate the rock slope.A series of numerical simulation experiments are designed by the control variable method.The peak acceleration curve of the monitoring point in the elevation direction and the surface direction of the slope and the peak acceleration value are used to explore the influence of the change of the structural surface parameters on the dynamic response of the rock slope.Based on the orthogonal test and the range analysis method,the sensitivity analysis of the structural plane parameters affecting the dynamic response of the rock slope is carried out,and then the influence degree of each influencing factor on the dynamic response of the rock slope is ranked from large to small:structural plane cohesion>structural plane dip angle>structural plane internal friction angle>structural plane thickness.This study can provide a theoretical basis for the disaster prevention and control of rock slopes with weak structural planes under earthquakes.