摘要
基于极限分析上限法的原理,结合随时间变化的拟动力法,考虑地震、水力和坡顶超载作用下建立含张拉裂缝的顺层岩质边坡极限分析模型,并推导出边坡安全系数的表达式。结构面采用合理的水压力分布形式,且强度参数采用非等比例折减,分析边坡前缘是否堵塞,水平和竖向地震系数、张裂缝积水深度和坡顶超载对边坡安全系数的影响。分析表明:边坡前缘堵塞、水平地震系数、张裂缝积水深度和坡顶超载的增加,降低边坡的稳定性;竖向地震系数的增加提高了边坡的稳定性。随着非等比例折减相关系数的增加,边坡稳定性显著提高。因此结构面参数的变化规律需要得到关注。
A limit analysis model for the stability of bedding rock slopes with a tensile fracture is established based on the upper bound limit analysis method and pseudo-dynamic method after considering the influences of earthquake,water pressure,and surcharge,and the corresponding formula of slope safety factor is derived.The facts of whether the front edge of the slope is blocked and the influences of the horizontal and vertical earthquake coefficients,the depth of water in the tension crack,and the surcharge on the slope safety factor are analyzed in detail by employing a reasonable form of water pressure distribution on the structure plane and non-proportional strength reduction.The results indicate that the blocked front edge of the slope,the increment of the horizontal earthquake coefficient,the depth of water in the tension crack,and the surcharge will reduce the slope stability,whereas the increment of the vertical earthquake coefficient will increase the slope stability.In addition,with the increase of non-proportional strength reduction coefficient,the safety factor of slope stability will significantly increase.Consequently,it is important to consider the strength parameter of the structure plane.
作者
宋桂锋
杜江梅
柯鉴
邓琴
梁艳峰
SONG Guifeng;DU Jiangmei;KE Jian;DENG Qin;LIANG Yanfeng(The Reconstruction and Extension Project Construction Headquarter of Yunnan Xiaomo Expressway,Jinghong 666100,Yunnan,China;Yunnan Communications Investment & Construction Group CO.,LTD,Kunming 650028,Yunnan,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,Hubei,China)
出处
《地震工程学报》
CSCD
北大核心
2019年第4期931-938,共8页
China Earthquake Engineering Journal
基金
国家自然科学基金资助项目(51608518)
云交科教[2016]163号一(三),云交科教[2017]23
关键词
拟动力法
极限分析上限法
顺层岩质边坡
非等比例折减
pseudo-dynamic method
upper bound limit analysis method
bedding rock slope
non-proportional strength reduction
