木河桥水库面板坝缺陷渗透稳定性数值模拟研究

Numerical Simulation of Seepage Stability of Face Slab Dam in Muheqiao Reservoir

为研究木河桥水库面板坝不同缺陷在库水位变动工况下的上下游坝坡渗透稳定性规律,利用Geo-studio软件进行数值模拟,得到缺陷面板坝的坝后浸润线高程、渗漏量及稳定性变化规律。研究结果表明,库水位高程越高,面板坝坝后浸润线高程越高,坝体的渗漏量越大,上游坝坡安全系数越大,下游坝坡安全系数越小;库水位骤降速率越大,最小安全系数出现的时刻越早,最小安全系数也越小;一旦面板发生缺陷,面板坝后的浸润线及渗漏量会出现较大的增长,安全系数下降幅度也较大,缺陷高程越高,面板坝后浸润线高程及渗漏量越大,安全系数也越小。

In order to study the seepage stability of upstream and downstream dams with different defects in Muheqiao reservoir under the condition of changing reservoir water level, the numerical simulation is carried out by using Geo-studio software, and the height of embankment line behind the dam is obtained. The results show that the higher the height of reservoir water level, the higher the height of the wetting line behind the concrete face dam, the greater the leakage of dam body, the greater the safety factor of upstream dam slope and the smaller the downstream dam slope safety factor. The greater the rate of sudden drop of reservoir water level, the earlier the minimum safety factor appears and the smaller the minimum safety factor is. The higher the height of defect, the greater the height and leakage of the infiltrating line behind the concrete face dam, the smaller the safety factor.