库水位升降条件下邻近坝址区堆积体边坡稳定性分析  

Stability Analysis of Talus Slope near Dam Site under Reservoir Water Level Rise and Fall Condition

作　　者：原先凡[1] 邓华锋[1] 蔡健[1] 张凯[2] 袁玉琳[2] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《水电能源科学》2013年第9期135-137,共3页Water Resources and Power

基　　金：973计划前期研究专项课题基金资助项目(2012CB426502);湖北省自然科学基金资助项目(2012FFB03805);三峡大学科学基金资助项目(KJ2011B008);三峡大学研究生科研创新基金资助项目(2012CX022)

摘　　要：针对某水电站蓄水后对坝址上游右岸堆积体边坡稳定性影响的问题,根据非饱和土体瞬态有限元渗流控制方程构建了堆积体边坡二维计算模型,再利用GeoStudio软件中的SEEP模块计算了不同库水位升降速率、不同边坡渗透系数条件下边坡内的渗流场分布规律,再采用摩根斯坦—普莱斯极限平衡法计算各瞬态渗流场下最危险滑带的安全系数。结果表明,不同库水位上升速率及渗透系数时随库水位的上升边坡安全系数增大,不同库水位下降速率及渗透系数时随库水位的下降边坡安全系数减小。Aiming at the influence of a certain hydropower station on the slope stability of talus slope in the upstream right bank of dam site after storage water, two-dimensional calculation model is established based on unsaturated soil transient finite element seepage corltrol equation. And then SEEP module in GeoStudio software is used to calculate the distribution regularities of slope seepage field under the condition of different reservoir level fluctuation rate and different permeability coefficient. Finally, Morgenstern-Price limit equilibrium method is applied to calculate the safety factor of the most dangerous sliding zone under transient seepage field. The results show that the slope safety factor increases with the rise of water level under the conditions of different water level rise rate and permeability coefficient, and the slope safety factor de- creases with the drop of water level under the condition of different water level rise rate and permeability coefficient.

关 键 词：库水位 堆积体 渗透系数 升降速率 渗流场 边坡稳定性 

分 类 号：TV139.14[水利工程—水力学及河流动力学] TU441.35[建筑科学—岩土工程]