穆家沟水库石膏夹层对坝基渗透和渗漏稳定性分析  

Analysis of Seepage and Seepage Stability of Gypsum Interlayer of Mujiagou Reservoir to Dam Foundation

作　　者：郑莉 Zheng Li(Shenzhen Water Planning&Design Institute Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]深圳市水务规划设计院股份有限公司,广东深圳518000

出　　处：《三峡大学学报（自然科学版）》2019年第S01期182-184,共3页Journal of China Three Gorges University：Natural Sciences

摘　　要：穆家沟水库枢纽区岩体为白垩系粉砂质泥岩夹泥质粉砂岩,分布有石膏夹层,主要呈薄层状、脉状发育或呈斑状、团块状充发育于泥岩中.试验结果及类似工程经验表明,石膏在水流通性较好的情况下,能够不断溶解,石膏地层会持续溶蚀并发展形成渗漏通道,发生大规模渗水,并产生渗透破坏.穆家沟水库坝基下部地层透水性微弱,无大规模石膏溶蚀空洞和通道,石膏发育于透水性差的泥岩内,地下水循环条件差,坝基下部的石膏夹层在采取有效的防渗处理措施后,不会产生大的溶蚀现象,不存在渗漏稳定问题.The Mujiagou Reservoir Junction area is composed of Cretaceous silty mudstone and argillaceous siltstone with gypsum interbeds which are mainly thin-bedded, vein-like or porphyry-like mass-filled mud-stone. Test results and similar engineering experience show that gypsum can dissolve continuously under the condition of good water circulation, therefore, gypsum stratum will dissolve continuously and develop to form leakage passage. Then, large-scale water seepage and seepage damage occur. The water permeability is weak in the lower stratum of Mujiagou Reservoir dam foundation, so there is no large-scale gypsum dissolution cavity or channel. The gypsum is developed in the mudstone with poor water permeability and poor groundwater circulation condition. The plaster interlayer in the lower part of the dam foundation will not cause large dissolution after effective anti-seepage treatment measures are taken. There is no leakage stability problem.

关 键 词：石膏夹层 持续溶蚀 渗漏稳定 

分 类 号：TV223.6[水利工程—水工结构工程]