江坪河水电站坝址岩溶水文地质特征及防渗可靠性分析

江坪河水电站库坝区水文地质条件复杂,碳酸盐岩地层广泛分布,水库岩溶渗漏是工程的关键技术问题。可研阶段预测坝址到河湾下游黑洞泉之间存在含水层地下水位低槽,但施工期未发现该地下水位低槽,根据实际揭露的地质缺陷进行了处理。介绍了坝址施工期揭露的岩溶水文地质特征及防渗方案,并论证了防渗方案的可靠性。工程实践表明,防渗方案是可靠的。

Analysis of Karst Hydrogeological Characteristics and Anti-seepage Reliability of Dam Site in Jiangpinghe Hydropower Station

The hydrogeological conditions in the dam area of Jiangpinghe Hydropower Station are complex, and the carbonate strata are widely distributed, so the karst leakage of reservoir is a key technical problem of the project. In the feasibility study stage, it is predicted that there is a low-level aquifer groundwater trough between dam site and Heidong Spring in the downstream of river bay, but this low-level groundwater trough is not found during the construction period. The geological defects revealed by actual excavation are treated. The karst hydrogeological characteristics exposed in the construction period of dam site and corresponding anti-seepage scheme are introduced, and the reliability of anti-seepage scheme is also demonstrated. The actual engineering practice shows that the anti-seepage scheme is reliable.