屋檐洞溶洼水库坝体工程条件与渗漏分析  

Engineering condition and speeage analysis of dam for Wuyandong karst depression reservoir

作　　者：李兆林[1] 邹胜章[1] 罗伟权[1] 陈宏峰[1] 

机构地区：[1]中国地质科学院岩溶地质研究所,桂林541004

出　　处：《水文地质工程地质》2006年第2期71-74,共4页Hydrogeology & Engineering Geology

基　　金：地调项目<西南岩溶地区地下水与环境地质调查综合研究>(200310400043);国土资源部科技攻关项目<表层岩溶带调蓄与生态重建试验规范>(20010303)

摘　　要：溶洼成库,是岩溶区地下水开发的主要途径之一。屋檐洞溶洼水库是封堵地下河形成的地下、地表联合水库,堵体位于距地表182m的地下河道中。除主体工程外,坝体上部有厚110m的松散堆积作为天然坝体。通过实地勘测、钻探及物探等成果资料和地下河试堵工程观察分析,上部松散体主要由滑坡堆积而成。本文对滑坡体的成因条件和坝体工程地质特征进行分析,认为滑坡是由水流冲刷、地貌、岩体结构及外应力等的共同作用产生的,对坝体的稳定具有一定的影响,但滑坡体渗漏是成库的关键。按不同渗漏条件,可分为上部松散体及岩溶裂隙和层间错动带的渗漏,渗漏点分布于550m高程以上。通过研究,该坝体在采取相应工程措施处理的基础上,蓄水高程可达650m左右,可形成以地下河道为主要蓄水空间的溶洼水库。Karst depression reservoir is one of the main approaches to develop ground water in karst area. Wuyandong reservoir is an underground and surface united reservoir by plugging subterranean stream. The stem is in the underground river way, 182 m of depth from the surface. In addition to main project, there is incompact deposit of 110m in the thickness being as natural dam, which consists of landslide accumulation through data analysis of reconnaissance on the spot, drilling, geophysical exploration and observation on trying to plug the subterranean stream. It is considered in this paper that the landslide came into being by synthetical functions of stream erosion, physiognomy, and rock configuration, outside force, besides, by way of analysis of cause of formation and the characteristics of engineering geology. The landslide would affect the stabilization of the dam in some extent, but seepage is the key factor to construct successful reservoir. According to different conditions, seepage approaches are classified as upside incompact deposit, karst crannies and glide zone between formations, whose altitudes are above 550m. Karst depression reservoir with the riverway of subterranean stream as storage space can be built and the impounding altitude of which can reach about 650 m if the dam was disposed properly by utilization of corresponding measures .

关 键 词：屋檐洞地下河 天然坝体 溶洼水库 滑坡 渗漏 

分 类 号：P642.25[天文地球—工程地质学]