地震作用下反倾岩质边坡弯曲倾倒稳定性分析  

Stability Analysis of Anti-Dip Rock Slope Subjected to Toppling Failure Under Earthquake Action

作　　者：徐伟 XU Wei(Northwest Branch of China Railway 25th Bureau Group Co.Ltd.,Xi′an Shaanxi 710016,China)

机构地区：[1]中铁二十五局集团有限公司西北分公司,陕西西安710016

出　　处：《铁道建筑技术》2025年第2期26-30,112,共6页Railway Construction Technology

基　　金：中铁二十五局集团有限公司西北分公司边坡滑坡治理方向资助项目(CR25XB-TL-YA6B-2021-00002)。

摘　　要：地震作用下反倾岩质边坡失稳问题是我国西南地区工程建设经常面临的威胁。本文研究地震波纵波和横波共同作用,基于极限平衡法提出一种考虑地震力方向的反倾岩质边坡稳定性分析方法,并采用Matlab编制地震作用下边坡稳定性计算程序,最后采用计算程序对地震力影响系数(k和α)、坡角、岩层倾角、岩层厚度等进行参数分析。结果发现,对比不同地震影响系数k和α值时的剩余下滑力变化趋势可知,k值变化对剩余下滑力的影响更为显著;坡角越大边坡稳定性越差,当坡角为60°~70°时地震作用下边坡稳定性对坡角变化最敏感;岩层倾角增大将会加剧边坡在地震作用下的破坏,且这种加剧破坏作用将随岩层倾角的增大而逐渐增强;岩层厚度越大,边坡剩余下滑力越小,边坡稳定性越好,但岩层厚度对边坡稳定性的影响不会因为k值变化而加剧或减弱。本研究结果可为地震频发山区反倾边坡稳定性评价及治理提供理论依据。The stability of anti-dip rock slopes under earthquake action is a long-term threat faced by engineering construction in the southwest of China.This article explores the combined effects of longitudinal and transverse waves in earthquakes.A stability analysis method for anti-dip rock slopes considering the direction of earthquake load was proposed based on the limit equilibrium method,and a stability calculation program with Matlab for slopes under earthquake action was developed.Finally,the program was used to analyze the parameters of influence coefficient(k andα)of earthquake load,slope angle,dip angle of rock layer,and rock thickness.The results show that comparing the changing trends of the residual sliding force under different earthquake influence coefficients k andα,it can be seen that the change of k has a more significant impact on the residual sliding force.The larger the slope angle,the worse the slope stability.When the slope angle is 60°~70°,the slope stability under earthquake action is the most sensitive to changes in slope angle.The increase in column dip angle will exacerbate the damage of slopes under earthquake action,and this intensified damage effect will gradually increase with the increase of column dip angle.The thicker the rock layer,the smaller the residual sliding force of the slope,and the better the stability of the slope.However,the influence of rock layer thickness on slope stability will not be exacerbated or weakened by changes in the k.The research results of this article can provide theoretical basis for the stability evaluation and treatment of anti-dip slopes in earthquake prone mountainous areas.

关 键 词：反倾边坡 地震作用 边坡稳定性 理论分析 

分 类 号：TU457[建筑科学—岩土工程] P642.2[建筑科学—土工工程]