结构面对岩质边坡地震动影响的数值模拟研究  

Numerical Simulation of the Influence of Structural Planes on Seismic Motion on Rock Slopes

作　　者：田小甫[1] 孙进忠[2] 刘立鹏[3] 郑小燕[1] 贾雷[1] 

机构地区：[1]北京市地质工程勘察院,北京100048 [2]中国地质大学(北京),北京100083 [3]中国水利水电科学研究院,北京100044

出　　处：《地质与勘探》2012年第4期840-846,共7页Geology and Exploration

摘　　要：本文采用数值模拟的方法,利用UDEC软件,开展了结构面对岩质边坡地震动影响的数值模拟研究,研究内容涉及结构面产状和位置变化对岩体边坡地震动放大系数空间展布的影响。根据岩体边坡中结构面发育的一般规律,本文模型工况主要考虑与坡面相交的贯穿性结构面,模拟的主要物理对象是层面、贯穿性长大软弱结构面等。数值模拟结果表明:结构面越靠近坡顶,边坡上部的地震动响应越强烈;顺倾结构面会使坡肩部形成更强烈的地震动响应;边坡越陡,坡顶和坡肩部的地震动响应越强烈。上述规律对于岩质边坡地震稳定性分析具有指导意义。Numerical simulation with software UDEC is conducted to study the influence of structural planes on the earthquake motion on rock slopes..The study deals with the influence of varying attitudes and positions of structure planes on the amplification of earthquake motion on rock slopes.According to general situations of structure planes developing in rock slopes,this study focuses on penetrating structural planes intersecting with the slope surface.And the primary objectives of simulation are strata layers and long penetrating weak structural planes.The results show that the closer the structural plane to the top surface of the slope,the stronger the earthquake response of the slope is.The structural plane downward to the slope surface will cause stronger earthquake motion on the upper slope body than that caused by structural planes horizontal or anti-dip to the slope surface.A steeper slope surface can produce stronger earthquake motion on the top or shoulder of the slope.The laws above mentioned will be valuable references to the earthquake stability analysis of rock slopes.

关 键 词：岩质边坡 结构面 地震动加速度放大系数 数值模拟 

分 类 号：P642[天文地球—工程地质学]