水位升降下库岸土质边坡破坏机理及稳定性研究  

Study on Failure Mechanism and Stability of Soil Slope of Reservoir Bank under Reservoir Water Level Fluctuation

作　　者：付伟[1] 张晶[1] 詹永祥[2] FU Wei;ZHANG Jing;ZHAN Yongxiang(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《路基工程》2021年第6期43-47,共5页Subgrade Engineering

基　　金：国家重点研发计划重点专项项目(2018YFC0809605);国家自然科学基金项目(41972294,41672312);吉林省交通运输科技项目(2019-1-5)。

摘　　要：运用岩土有限元软件GeoStudio及非饱和土中渗流和抗剪强度理论,探究库水位升降过程中库岸土质边坡变形和稳定性的变化规律。研究表明:库水位上升时,坡前岸滩产生向下竖向变形,同时边坡产生指向坡体内的水平变形;库水位上升致使边坡稳定系数先快速增大,后随渗流进程再迅速减小并逐渐趋于稳定。库水位下降时,坡体前缘水压减小,边坡产生卸载回弹,坡前岸滩产生向上的竖向变形,同时边坡产生指向坡外的水平变形;库水位下降致使边坡稳定系数先快速减小,后随渗流进程再迅速增大并逐渐趋于稳定;库水位陡降瞬时对边坡的稳定性极为不利。In this paper,the variation law of deformation and stability for soil slope of reservoir bank in the process of reservoir water level fluctuation is studied by the geotechnical finite element software GeoStudio,seepage and shear strength theory in unsaturated soil.The results show that:when the reservoir water level rises,the bank in front of the slope will produce downward vertical deformation,and the slope will produce horizontal deformation pointing to the slope body;the rise of reservoir water level causes the slope stability factor to increase rapidly at first,then decreases rapidly with the seepage process and gradually tends to be stable,when the reservoir water level drops,the water pressure at the front of the slope will decrease,the slope will produce unloading rebound,the bank in front of the slope will produce upward vertical deformation,and at the same time the slope will produce horizontal deformation outside the slope;the decline of reservoir water level causes the slope stability coefficient to decrease rapidly at first,then increases rapidly with the seepage process and gradually tends to be stable.The results show that it is extremely unfavorable for the slope stability when the reservoir water level drops sharply.

关 键 词：库水位升降 库岸土质边坡 渗流 稳定性 破坏机制 

分 类 号：TU473.1[建筑科学—结构工程]