青居电站基础廊道渗漏水中SO4^2-、Ca^2+浓度显著偏高成因分析  

Analysis of Causes of High Concentration of SO4^2- and Ca^2+ in Leakage Water of Foundation Gallery of Qingju Hydropower Station

作　　者：陈伟 何鹏[1] 余德可 黄野 CHEN Wei;HE Peng;YU De-ke;HUANG Ye(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《水电能源科学》2020年第10期63-66,共4页Water Resources and Power

摘　　要：青居电站泄洪闸基础廊道渗漏水中SO4^2-、Ca^2+的浓度异常偏高,但在闸坝变形、渗流监测中未发现大规模石膏带出量。通过分析、计算不同环境水样的水化学特征,获得了电站运行至今通过排水廊道渗漏水排出的石膏溶蚀量,结合电站库区地质条件,得出异常偏高离子浓度产生的原因并非完全是闸基地层中石膏质溶蚀,而是在更广大的区域范围内,地下水通过在地层中交错发育的陡立结构面渗流过程中溶蚀沿途石膏质后在闸基帷幕上游侧局部富集而成。The concentration of sulfate(SO42-)and calcium(Ca2+)ions in the leakage water from the foundation gallery of the flood discharge gate of Qingju Hydropower Station was abnormally high,but no large-scale gypsum was found in the deformation and seepage monitoring of the gate.By analyzing and calculating the hydrochemical characteristics of different environmental water samples,the amount of gypsum dissolution discharged through the leakage of drainage gallery has been obtained since the operation of the hydropower station.Based on the geological conditions of the reservoir area,it is concluded that the reason for the abnormally high ion concentration is not completely gypsum dissolution in the gate foundation stratum,but in a wider area,the groundwater is locally enriched in the upstream side of the gate foundation curtain through the dissolution of gypsum along the seepage process of crisscross structural planes in the stratum.

关 键 词：基础廊道 渗漏水 石膏质 溶蚀 地下水 

分 类 号：P641.3[天文地球—地质矿产勘探]