某强岩溶区水库防渗关键参数的最终确认

Final confirmation on key seepage control parameters of reservoir in strong karst area

某水库坐落于太湖上游山前过渡地带,水库周边岩溶发育,属强岩溶区,因地质条件复杂,给地质勘察工作造成极大困难,致使水库防渗关键参数无法确认。为此,在水库施工阶段,结合实际情况,适时提出了"以前期勘察成果为指导,以施工先导孔为基础,以跨孔电磁波CT为探测手段,以先导孔压水灌浆试验为依据"的技术研究路线,经综合论证最终确认了水库岩溶防渗参数。

A reservoir is located at the upstream piedmont transition zone of Taihu Lake Basin, where karst develops strongly. In the dam foundation area, 6 complicated karst underground rivers were discovered and the lower limit of the karst cave is deep, resulting in unable confirmation to key seepage control parameters for the reservoir. After engineering exploration, the final re- search paths suitable to confirming the key seepage control parameters was determined, i. e, determining the research means and paths of seepage control works during construction period, confirming the final parameter of karst seepage prevention, and the method had been successfully used in engineering practice. At present, the reservoir has passed safety appraisal and experienced the water impoundment test of 2 summers and 1 winter.