不同降雨类型循环下二元边坡渗流场及稳定性分析  

Analysis of Seepage Field and Stability of Binary Slope under Different Rain Type Cycles

作　　者：查文华 杨晗 许涛 赵志豪 黄仁贵[1] ZHA Wenhua;YANG Han;XU Tao;ZHAO Zhihao;HUANG Rengui(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330103 Jiangxi China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330103

出　　处：《水力发电》2024年第7期31-37,共7页Water Power

基　　金：2023年江西省研究生创新专项资金项目(YC2023-S588)。

摘　　要：为研究不同降雨条件对二元边坡的影响,以福建某公路边坡为例,基于饱和-非饱和渗流理论,利用Geo-Studio软件,模拟不同类型降雨对二元边坡渗流场和稳定性的影响,探讨不同降雨类型循环条件下二元边坡的渗流场和安全系数的变化规律。结果表明,降雨引起的孔隙水压力变化在边坡表层土体和内部岩层之间存在显著差异,土-岩接触面存在潜在滑动面;总降雨量相同时,表层土体孔隙水压力变化曲线呈现不同变化规律,前期型呈上凸型,中期型、均匀型都呈直线型,后期型呈下凹型;下部岩层坡顶、坡面处孔隙水压力变化曲线在降雨周期前期不变,在后期突然增大升至饱和状态,坡脚处岩层的孔隙水压力变化趋势与表层土体一致;安全系数变化与降雨时间分布一致,并具有明显的滞后性;降雨最不利时,潜在滑动面由边坡内部上移到土-岩接触面处及内部岩层接触面处。In order to study the impact of different rainfall conditions on binary slopes,taking a highway slope project in Fujian as the study object,based on the saturated-unsaturated seepage theory,the Geo-Studio software is used to simulate the effects of different types of rainfall on the seepage field and stability of binary slopes,for studying the changes in seepage field and safety factor of binary slopes under different rain pattern circulation conditions.The research results show that,(a) there are significant differences in pore water pressure change caused by rainfall between the surface soil and internal rock layers of the slope,and there is a potential sliding surface at the soil-rock contact surface;(b) when the total rainfall is the same,the change curve of pore water pressure of the surface soil is convex in the early stage,linear in the middle stage and uniform type,and concave in the later stage;(c) the pore water pressure curves at the top and surface of the lower rock layer remain unchanged in the early stage of rainfall cycle,and suddenly increase to the saturated state in the later stage of the cycle,and the change trend of pore water pressure in the rock layer at slope foot is consistent with that of the surface soil;(d) the change of safety factor is consistent with the rainfall time distribution and has obvious hysteresis;and(e) when the rainfall is the most unfavorable,the potential sliding surface moves upward from the inside of slope to the soil-rock contact surface and the internal rock layer contact surface.

关 键 词：降雨入渗 二元边坡 稳定性分析 饱和-非饱和渗流 潜在滑动面 安全系数 

分 类 号：TU457[建筑科学—岩土工程]