清江大龙潭水利枢纽防渗帷幕设计及效果监测分析  

ANTI-SEEPAGE CURTAIN-DESIGNING AND MONITORING AT DALONGTAN HYDRO PROJECT IN QINGJIANG RIVER

作　　者：谭朝爽[1] 王永胜[1] 王团乐[1] 钱海涛[2] 

机构地区：[1]长江三峡勘测研究院有限公司(武汉),武汉443003 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《工程地质学报》2010年第2期273-280,共8页Journal of Engineering Geology

摘　　要：大龙潭水电站坝址位于碳酸盐岩地区,岩溶发育受岩性和构造控制:在奥陶系南津关组第一段(O1n1)页岩夹灰岩、第二段第一层(O1n2-1)泥质条带灰岩及寒武系第四段第二层硅质条带灰岩(∈34m-2)中岩溶不发育,其他地层的灰岩中岩溶发育;岩溶发育方向主要沿岩层层面和顺河向的断层发育,形成岩溶通道。因此水库渗漏主要沿岩溶发育的断层产生,防渗帷幕设计以奥陶系底部18.8m页岩为防渗依托,并重点加大断层部位的工程量。后期地下水长期观测分析表明,帷幕防渗效果良好,不存在大的库水渗漏,仅在局部断层构造发育部位渗漏量略大。大龙潭水电站防渗帷幕工程成功的范例为碳酸盐岩地区其他工程的防渗优化设计提供了很好的借鉴意义。Dalongtan hydropower station is located in one carbonate rock area.The karsts are controlled by lithologic characters and structural features as follows： 1）the lithology in the first member of Najinguan formation of Ordovician（O1n1）,the first layer of the second member of Najinguan formation（O1n2-1）and the second layer of the fourth member of the Cambrian（∈4-23m）are shale infiltrated limestone,band argillaceous limestone and band siliceous limestone respectively.The karts in these rocks are very weak and oppositely strong in other rock layers;2）Karsts develop along the bedding surface and fault plane,which form karst canals.So the seepage mainly occurs along these karst faults.In anti-seepage curtain-designing,the design relies on the shale of 18.8 m depth and emphasizes the locations of the faults.Results of the long-term groundwater observation and analysis show that the efficiency of the anti-seepage curtain is very good and there is no large seepage.Only at the sites where the faults pass,the amount of seepage may be somewhat larger.The achievement of the anti-seepage curtain-designing in Dalongtan hydropower station gives a good example and may provide significant reference for other projects.

关 键 词：大龙潭水电站 岩溶 渗漏 帷幕设计 监测分析 

分 类 号：P642[天文地球—工程地质学]