关键词: 抽水蓄能电站, 输水系统, 围岩, 多手段探测, 渗透, 薄弱部位, 机制

Abstract: It is a kind of complicated geo-engineering surveying the weakness area of anti-seepage within surrounding rock masses of water-diversion system of a pumped storage power plant. In order to avoid the uncertainty involved only by one method, four methods, i.e. ?-ray radioactive determination, resistivity exploration, natural tracer and water quality analyzing method, were used in this case study. Essentially, the former two methods are based on geophysics, while the latter two ones are on geochemistry. According to the results, it is believed that some weakness areas of anti-seepage indeed exist within the domain. They were remarked with negative abnormal ?-ray density, lower resistivity, water chemistry mostly in coincidence with one as its recharge source, and others. As to the formation, it is resultant from the coupled action of multi-fields, in which hydro-dynamic and geochemical action are mostly active.

Key words: pumped storage power plant, water-diversion system, surveying with multi-methods, seepage, weakness, mechanism