北京市海子水库南副坝渗流及稳定性分析

Analysis of Seepage and Stability of South Secondary Dam of Haizi Reservoir in Beijing City

基于工程地质勘察资料和水文资料,结合工程实况引入等效渗流系数的概念,选取典型断面,对海子水库南副坝及坝基的渗流进行了有限元模拟计算,分析了正常蓄水位、设计洪水位、校核洪水位时渗流作用下的下游坝坡的稳定性,并对混凝土防渗墙深度对渗透量和稳定安全系数的影响进行了分析,得到海子水库南副坝可以加深防渗墙至55m,渗透量减少35%左右,并且防渗墙的加深对坝坡的稳定性还有一定的加强作用。

On the basis of the engineering geological survey materials and hydrologic data of the south secondary dam of Haizi reservoir in Beijing City,combined with engineering fact,the equivalent seepage coefficient was introduced to simulate the seepage and stability.In the finite element model,the south secondary dam and dam foundation were selected as the typical sections.Then the stability of downstream dam slope acted by the seepage at different storage level（normal storage level,designed storage level and gauged storage level）was analyzed.Furthermore,the influence of the depth of the concrete imperious wall on the infiltration capacity and the buckling safety factor was analyzed.And the analysis indicates that the seepage quantity reduced about 35% when the depth of the concrete imperious wall was set as 55 m.Moreover,the stability of dam slope was also affected by the depth of the imperious wall.