断裂构造发育对贵州两岔河水库岩溶渗漏的影响研究

贵州两岔口水库地质环境复杂,断层构造发育破坏了库区地层结构,导致岩溶渗漏。为保证两岔河水库的正常运行,主要针对其岩溶渗漏的地质问题,在开展工程地质测绘、岩溶调查统计、钻孔勘探及压水试验等工作的基础上,分析了断裂构造对地层结构、岩体完整性、岩溶发育及水库渗漏的控制影响。研究表明:断层构造发育破坏了库区地层结构,形成"构造切口",水库左岸不能形成地层封闭;岩体完整程度为破碎—极破碎,地下岩溶强发育,易形成水库岩溶渗漏;地下岩溶管道发育方向基本和断层走向一致,断层构造对岩溶发育起着明显的控制作用;水库渗漏为折线式复合型渗漏。研究成果为岩溶地区水库防渗处理提供参考。

Study on impact from development of fault structure on Karst leakage of Liangchahe Reservoir in Guizhou

As the geological environment of Liangchahe Reservoir is complicated，the stratigraphic structure within the reservoir area is damaged by the development of fault structure，which causes the Karst leakage. In order to ensure the normal operation of the reservoir，the dominate impact from the fault structure on the stratigraphic structure，rock mass integrity，Karst development and reservoir leakage is analyzed mainly for the geological problem of Karst leakage on the basis of the engineering geological survey，Karst investigation，drilling exploration，pressure water test，etc. The study shows that the stratigraphic structure within the reservoir area is damaged by the development of fault structure，thus a structural cutting is formed and a stratigraphic trap cannot be formed at the right bank of the reservoir，while the degree of the rock mass integrity becomes from broken to seriously broken with strongly developed underground karst structure that is prone to create the karst leakage of reservoir. Furthermore，the developing direction of the Karst conduit is basically consistent with the fault strike，the fault structure has a significant dominate effect on the Karst development and the reservoir leakage is a kind of broken line composite leakage. The study result can provide reference for the anti seepage treatment of reservoir in Karst region.