高泉水库三维渗流数值模拟及坝基渗漏原因分析

针对江西高泉水库渗漏问题,根据坝址区工程地质和水文地质特征建立坝址区地下水渗流三维数值模型,采用有限元法对模型进行求解;在此基础上,以长期渗漏监测结果为目标值,反演坝基岩体综合渗透参数,通过帷幕施工前后综合渗透参数变化规律,分析坝基渗漏原因.计算结果表明,防渗帷幕施工前后坝基岩体综合渗流参数差异大,帷幕施工前坝基渗漏主要是由坝基岩体中存在岩溶通道引起,防渗帷幕对控制坝址区渗漏量起到较好的作用.

Three dimensional numerical simulation of seepage for Gaoquan Hydropower Station and analysis of reasons of foundation seepage

According to the engineering geological and hydrogeological characteristics of dam region, a modol for the three-dimensional numerical simulation of flow is established to solve the seepage problem of Gaoquan Hydropower Station. Based on the simulation of the three-dimensional seepage fields, the parameter of foundation seepage is back-analysed using the long-term monitoring results of leakage, and the reasons of foundation seepage are analyzed through the parameter variation before and after the curtain con- struction. The results show that the foundation parameter before the impervious curtain construction is great- er than that after the impervious curtain construction due to existing foundation seepage caused by karst channels, and the impervious curtain plays a major role in controlling the leakage of the dam site.