溪洛渡水电站蓄水前后灰岩水文地质条件变化分析  

Analysis on changes of limestone hydrogeological conditions before and after impoundment of Xiluodu Hydropower Station

作　　者：徐海洋 崔长武 张绍成 XU Haiyang;CUI Changwu;ZHANG Shaocheng(POWERCHINA Chendu Engineering Corpoation Limited,Chengdu 610072,China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《人民长江》2021年第6期65-70,共6页Yangtze River

摘　　要：溪洛渡水电站自蓄水发电以来,在坝址上下游一定范围内均发生了谷幅变形。国内科研团队研究认为,蓄水后坝址区水文地质条件的改变是引起谷幅变形的重要因素之一。基于温度场和渗流场专题研究工作所收集的大量基础资料,从温度、水位、水质和同位素4个方面对比研究了溪洛渡水电站蓄水前后灰岩承压水水文地质变化特征。分析表明:蓄水后坝基下部灰岩承压水温度没有明显变化,承压水水位受水库蓄水影响大幅升高,少量库水入渗到灰岩承压水中导致承压水水质有所改变,灰岩承压水仍然主要来自于区域盆地周边灰岩出露区大气降雨补给,通过深部循环向金沙江排泄。Since the Xiluodu Hydropower Station impounded for power generation,valley deformation occurred in a certain range of upstream and downstream of the dam site.The domestic scientific research team believes that the change of hydrogeological conditions in the dam site area after impoundment is one of the important factors causing valley deformation.Based on a large amount basic data collected from the special research work of temperature field and seepage field,we analyzed the limestone confined water hydrogeological characteristics before and after impoundment of the Xiluodu Hydropower Station from four aspects,including temperature,water level,water quality and isotope.Preliminary analysis showed that there was no obvious change in the water temperature of the limestone confined water after impoundment,but the water level of the confined water greatly increased.A small amount of reservoir water infiltrated into the limestone confined water,thus causing a slight change in the quality of confined water.The limestone confined water is still recharged by atmospheric rainfall in the limestone exposed area around the regional basin,and discharged to the Jinsha River through the deep circulation.

关 键 词：灰岩承压水 涌水 水温 同位素 溪洛渡水电站 金沙江 

分 类 号：TV697.32[水利工程—水利水电工程]