基于数值法的某大坝渗流安全分析

Safety Analysis of a Dam Seepage Flow Based on Numerical Method

碗窑水库为碾压混凝土重力坝,在超过20年的运行中出现了渗漏的情况,近年来渗漏现象尤为明显。为了解坝体安全情况,根据坝址区地勘资料与布置在坝体上的钻孔压水试验数据,通过参数反演,对坝体进行三维地下水数值模型建模,预测坝体平均水力坡降,分析坝体的渗流安全状况。结果表明:碗窑水库防渗面板防渗性能下降,坝体平均水力坡降在个别工况下超过了允许水力坡降,需要对防渗层进行加固以保障水库长期运行安全。

The Wanyao Reservoir is a gravity dam,and it is made by roller compacted concrete（ RCC）.The problem of leakage appears when it has operated more than 20 years. Recently,the leakage phenomenon is particularly obvious in recent years. In order to understand the safety situation of dam,according to the geological prospecting data in the dam site and the drilling and pressure water test data on the dam,through the parameter inversion,the 3 D groundwater numerical model for dam is built,and it is used to forecast the average hydraulic gradient of dam body and analyse the safety situation of dam leakage. The results show that the impervious performance of impervious panel declines in Wanyao Reservoir. The average hydraulic gradient of dam in individual working conditions exceeds the allowable hydraulic gradient.In order to ensure the long-term safe operation of reservoir,the impervious layer needs to be reinforced.