高坝洲水利枢纽岩溶渗漏研究与工程检验

Study on the karst seepage and the project check of GHP

高坝洲水利枢纽坝址与水库区石灰岩地层分布广 ,岩溶化程度很高。水库区存在沿清长分水岭、清渔分水岭和土地岭河间地块渗漏问题 ,坝址区存在严重的绕坝渗漏问题。经大量的地质调查、试验研究、地下水动态监测等多种手段 ,查明了坝址区及水库区的岩溶发育规律 ,最终确定 :在正常蓄水位 80m高程时 ,高坝洲水库不会发生渗漏 ,经帷幕处理后 ,也不会发生绕坝渗漏。 2 0 0 0年 4月 30日工程正式蓄水 ,经二年半满库运行的检验 ,验证了上述地质结论是正确的。

The dam site of the GHP and the reservoir area is situated on the limestone area with a high karst degree. The seepage problem in the reservoir area exists along the Qingchang and Qingyu watershed divides and in the Tudiling fields. In the dam site area, serious bypassing dam seepage occurs. In the investigation period, many ways such as geological survey, test and research and dynamic monitoring of underground water were used to find out the karst development laws in the reservoir area and in the dam site. It is concluded that at the normal pool level of 80 m, no seepage happened in the Gaobazhou reservoir and after the treatment of grouting curtain, no bypassing dam seepage could occur. The GHP formally impounded water on April 30, 2000. The operation of the Project for one and half years proved that the above mentioned geological conclusions are correct.