基于水文地球化学信息的某水电站坝区地下水来源分析  

Groundwater Source Analysis Using Hydrogeochemical Information in the Dam Area of a Hydroelectric Station

作　　者：孙蓉琳[1] 万军伟[1] 梁杏[1] 李远耀[2] 黄润太[3] 胡金山[3] 

机构地区：[1]中国地质大学环境学院,武汉430074 [2]中国地质大学地质调查研究院,武汉430074 [3]中国水电顾问集团成都勘测设计研究院,成都610072

出　　处：《地质科技情报》2010年第4期111-116,共6页Geological Science and Technology Information

基　　金：中国地质调查局计划项目专题"地下水系统理论与应用指南"(12120733908);中国博士后科学基金项目"裂隙岩体渗透系数非均质性研究"(3261230802);成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金项目"裂隙岩体渗透系数尺度效应研究"(GZ2006-07);中国地质大学优秀青年教师资助基金项目"基于裂隙网络随机模拟的玄武岩渗透系数尺度效应研究"(CUGQNL0712)

摘　　要：针对西南某在建水电站坝区左岸交通洞开挖过程中多处出现滴水、线状或股状流水现象,利用水文地球化学信息分析了裂隙岩体的地下水来源。分析显示,上游支流已建水电站的引水洞对研究区存在渗漏影响,坝区地下水主要是原花岗岩体裂隙水侧向补给和引水洞渗漏补给的混合。两种补给水源水化学特征差异显著,ρ(SO42-)可用来计算不同出水点两种水源的混合比。根据不同出水点引水洞渗漏补给的混合比,结合出水量大小,将坝区分为受引水洞渗漏补给影响较弱区、中等区和较强区,揭示了不同地段的地下水主要来源,为厂房施工过程中涌水量的预测与防渗排水设计提供了依据。Large quantity of groundwater occurred during the underground traffic tunnel excavating in the left bank of the dam area of a hydroelectric station in southwest Sichuan. This paper recognized the groundwater sources by hydrogeochemical information. The pattern of hydrochemical variation suggests that there are two kinds of groundwater sources, the original fractured water in granite and the leakage water from the water channel of another hydroelectric station. Because of the difference of the hydrochemical elements of the two groundwater sources, the content of SO4^2- was used to calculate the mixture ratio of each groundwater source. Based on calculation result, the influential degree of the water channel leakage was analyzed and the dam area was divided into three zones, such as, weak influential zone, medium influential zone and strong influential zone. The recognition of main groundwater sources in different zones in the dam area will guide the drainage and anti seepage design during underground factory excavating.

关 键 词：水文地球化学信息 地下水来源 裂隙水 渗漏水 

分 类 号：P345[天文地球—水文科学]