岩层倾角对顺倾向边坡地震效应的影响  

Impact of Dip Angle of Rock Stratum on Seismic Response of Consequent Slope

作　　者：丁梓涵 赵其华[1] 彭社琴[2] 陈继彬[2] 喻豪俊 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《地震工程学报》2015年第4期956-962,共7页China Earthquake Engineering Journal

基　　金：国家重点基础研究发展计划(2011CB013501);长江学者和创新团队发展计划(IRT0812)

摘　　要：利用FLAC3D软件模拟地震作用下不同岩层倾角的顺倾向边坡,对比坡面峰值加速度放大系数、峰值位移、地震作用结束后坡体剪应变增量的变化规律,探讨岩层倾角对顺倾边坡地震效应的影响。研究表明:(1)在水平地震波作用下,坡面水平峰值加速度放大作用随岩层倾角增大而线性减小;(2)当岩层倾角小于软弱岩层内摩擦角时,坡面峰值位移较小且变化规律受岩层倾角影响不明显,当岩层倾角大于软弱岩层内摩擦角且小于30°时坡面峰值位移增大,大于60°时减小;(3)岩层倾角小于坡角时,残余剪应变增量最大值集中在坡面中下部软弱岩层处,反之,剪应变增量最大值出现在整个坡面并呈弧形区。The southwest of China is located in a seismically active area,and in recent years earthquakes exceeding 7.0 magnitude have occurred in many locations in Yunnan and Sichuan provinces.In addition,the consequent stratified rock slope is developed well in the southwest of China,and this means that the strike and inclination direction of the slope is same as that of the rock stratum.Instability and failure of the consequent stratified rock slope is common during the construction of railways,highways,and water conservancy and hydropower engineering projects in the southwest of China.This is an urgent engineering construction problem which must be recognized and solved as soon as possible.Currently,there are certain researches being conducted on the seismic effects of this kind of slope,and the methods being used focus on the analysis of mechanical systems and model experiments.In these studies,the range of the rock stratum＇s dip angle is not sufficiently comprehensive and do not fully represent the seismic effects of dip angle of the rock stratum on the slope.Nor is the thickness of the rock layer in numerical simulations sufficiently precise,which affects the accuracy of the numerical simulation results.Using FLAC3 D software,in this study we simulated the consequent stratified rock slope for different dip angles of rock stratum（0°-90°）and detailed the thickness of the stratum（sandstone is 1mthick,weak mudstone is 0.1mthick）under seismic action.We then contrasted the regulation of the peak acceleration amplification factor,peak displacement,and shear strain increment after seismic action,and explored the impact of the rock stratum＇s dip angle on the seismic effect of the consequent stratified rock slope.This analysis will help to explain the instability mechanisms and slope failure modes,and lay the groundwork for disaster prevention in consequent stratified rock slopes.The study results are as follows：First,the peak horizontal acceleration amplification factor,which is relative to the slope toe,incre

关 键 词：岩层倾角 数值模拟 顺倾向层状岩质边坡 地震效应 

分 类 号：TU457[建筑科学—岩土工程]