琅琊山抽水蓄能电站上水库喀斯特渗漏特征及帷幕灌浆效果分析

Characteristics of Karst Leakage and Analysis of Curtain Grouting Effects for Upper Reservoir of Langyashan Pumped Storage Station

琅琊山抽水蓄能电站上水库建在灰岩地区,喀斯特渗漏问题是上水库的主要工程地质问题。从岩性、构造及地下水等方面入手,并结合钻孔透水率统计分析、钻孔及探洞的溶蚀率统计分析、落水洞连通试验等成果,论述了上水库水文地质条件及喀斯特发育特征,分析了各分水岭及主(副)坝基等不同工程部位的渗漏形式及范围,并对垂直帷幕灌浆的防渗处理效果从耗灰量及其衰减系数、灌浆前后的透水率变化、帷幕的连续性等方面进行了分析评价。

The upper reservoir of Langyashan Pumped Storage Station built in the limestone area. Karst leakage is one of the major problems of engineering geology, and its anti-leakage measures directly relate to the success of the project. From the aspects of lithology, geological structure and groundwater etc. , and in combination with statistical analyses of water percolation rate as well as, the dissolution rates of boreholes and grouting tunnels, and the Karst caves connectivity test results, this article firstly introduces the hydrogeologic condition and the Karst characteristics of the upper reservoir. Secondly, according to the different leakage types, it analyses the anti-leakage measures which have been used in the different project sites. Finally, on the basis of the analysis of the grout acceptance and its decay coefficient, water percolation rate and the curtain continuity, the article evaluates the effects of curtain grouting.