复杂工况下消落带边坡渗流特性及稳定性分析  

Analysis on seepage characteristics and stability of slope in hydro-fluctuation belt under complicated working conditions

作　　者：涂小兵[1] 申时钊 袁宇坤 雷进生[2] Tu Xiaobing;Shen Shizhao;Yuan Yukun;Lei Jinsheng(Huadong Engineering Corporation Limited,Hangzhou 311100,China;College of Civil Engineering&Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]华东勘测设计研究院有限公司,杭州311100 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《工程勘察》2021年第12期1-5,12,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(51709155)。

摘　　要：在库区消落带边坡工程中,边坡的变形常常与水位消落有着密切的关系,除了采用常规方法计算坡体安全系数来分析堤防稳定性,还需考虑水位涨落时带来的水—土相互作用。以白鹤滩水电站溜姑回填造地工程为例,综合采用饱和—非饱和渗流理论及毕肖普法进行堤防安全性计算,借助GeoStudio中SLOPE/W模块和SEEP/W模块进行边坡渗流场和应力场的耦合分析,模拟在施工期、运行期各种水位组合及降雨、地震工况下渗流作用对堤防稳定性的影响。研究表明:该方法能有效考虑体积水含量变化对安全系数的影响,边坡安全系数随着稳定蓄水位的升高而增大,在地震工况和降雨条件下均有一定程度减小;在库区水位变化时,安全系数、地下水位线及孔隙水压力均随着水位下降而降低,且安全系数随着下降速率增加而降低。采取边坡工程防治措施后,坡体受力正常,安全系数均满足设计要求。In the slope engineering of hydro-fluctuation belt in reservoir area, the deformation of slope is closely related to the fluctuation of water level. In addition to calculating the safety factor of slope by conventional method to analyze the stability of embankment, it is also necessary to consider the water-soil interaction brought by the fluctuation of water level. Taking the Liugu backfilling project of the Crane Beach Hydropower Station as an example, the saturated-unsaturated seepage theory and Bishop method are used to calculate the safety of the embankment, and the SLOPE/W module and SEEP/W module in GeoStudio are used to calculate the slope seepage field and stress field. The coupling analysis simulates the influence of seepage effects on the stability of dikes under various water level combinations, rainfall and earthquake conditions during construction and operation. The research shows that this method can effectively consider the influence of volumetric water content changes on the safety factor. The safety factor of slope increases with the increase of stable water level, and decreases to a certain extent under earthquake and rainfall conditions. When the water level changes in the reservoir area, the safety factor, groundwater level and pore water pressure all decrease with the decrease of water level, and the safety factor decreases with the increase of falling rate. After taking slope engineering prevention and control measures, the force of the slope body is normal, and the safety factor meets the design requirements.

关 键 词：消落带 渗流特性 边坡稳定性 数值模拟 复杂工况 

分 类 号：TU432[建筑科学—岩土工程]