摘要
为探究地震作用对双层土质边坡稳定性的影响,基于极限分析上限理论,建立了地震作用下双层土质边坡旋转破坏机构。采用拟静力法简化地震荷载作用,推导了双层土质边坡安全系数表达式。分析土体黏聚力比、边坡坡角以及地震作用对双层土质边坡稳定性及其滑动面参数的影响。研究结果表明:在水平地震作用下,随着黏聚力比的增大,边坡安全系数呈非线性增大且潜在滑动面变浅;当水平地震作用增强时,边坡失稳破坏范围显著加大;随着竖向地震系数及黏聚力比的增大,边坡安全系数略微降低;水平地震作用增强时,竖向地震作用对边坡稳定性的影响逐渐增大,此时需要考虑竖向地震的影响。
In order to explore the effect of earthquake on the stability of two-layered soil slope,based on the upper limit theory of limit analysis,the rotary failure mechanism of double-layer soil slope under earthquake was established.The pseudo-static method was used to simplify the seismic load,and the expression of safety factor of double soil slope was derived.The influences of soil cohesive force ratio,side slope angle and earthquake action on the stability and sliding surface parameters of double-layer soil slope were analyzed.The results showed that the slope safety factor increased nonlinearly and the potential slip surface became shallower with the increase of cohesion ratio under horizontal seismic action;when the horizontal seismic action was strengthened,the slope failure range increased significantly;with the increase of vertical seismic coefficient and cohesive force ratio,the slope safety factor decreased slightly;however,with the strengthening of horizontal seismic action,the influence of vertical seismic action on slope stability gradually increased,so it was necessary to consider the influence of vertical earthquake.
作者
刘杰
杨轶博
郭督
马志宏
LIU Jie;YANG Yibo;GUO Du;MA Zhihong(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)
出处
《沈阳大学学报（自然科学版）》
CAS
2024年第3期237-245,共9页
Journal of Shenyang University：Natural Science
关键词
地震作用
极限分析上限理论
双层土质边坡
拟静力法
安全系数
seismic excitation
upper bound theorem of limit analysis
two-layered soil slope
pseudo-static method
safety factor
