某抽水蓄能电站输水系统下平段区围岩渗透薄弱部位探测

对于地下工程围岩渗透薄弱部位的探测是一项具有隐蔽性和复杂性的地质工程.为避免或减少采用单一探测方法可能出现的不确定性,以一抽水蓄能电站为例,并行采用了4种方法对研究区进行了探测:(1)放射性法;(2)高密度电法;(3)天然示踪法;(4)水质分析法.就其原理而言,前2种方法属于应用地球物理范畴,而后2种方法则属于应用地球化学范畴.根据探测成果,认为区内岩体渗透薄弱部位是存在的,而以γ射线强度负异常、低电阻、渗漏水点水温及其他水质指标含量比较接近其补给源作为标志.就其形成机制而言,为多场耦合作用的产物;其中,水动力作用、水化学作用及其耦合作用为最活跃的因素.

Surveying of weakness areas of anti-seepage within surrounding rock masses of water-diversion system of a pumped storage power plant

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.