摘要
利用压水试验资料分析了主厂房区岩体在水平方向和垂直方向的渗透性。在水平方向,主厂房区岩体的渗透性以微透水-弱透水为主,部分甚至不透水,个别岩体中等透水,厂房位于比周边岩体渗透性弱的区域上。在垂直方向,主厂房区大部分岩体的渗透性随深度的增加而递减,但也有小部分岩体的渗透性变化不明显,并非随深度的增加而递减。导致这种现象的原因是这部分岩体中高倾角的裂隙和断层比较发育。在同一高程上,断层端点对岩体透水率有较大的影响,断层端部发育聚集的地方,岩体的透水率大。
In this paper,taking the Main Powerhouse in Underground Hydropower Station of the Three Gorges project as the research object,the horizontal and vertical permeability of the rock mass around the Main Powerhouse was studied by the borehole injection tests.In the horizontal direction,the permeability of rock masses in the Main Powerhouse area is mostly the micro permeable-weak permeable,and even some is water-proof,but individual rock mass is medium permeable.The results show that the location of the Main Powerhouse is suitable,and it is just located in the rock mass with permeability smaller than that of the surrounding rocks.In the vertical direction,most of the rock permeability in the main powerhouse area decreases with depth increasing,which conforms to the permeability law of most rock masses.However,the permeability of some small part of rock mass does not decrease with the depth change,and there is no big difference among the values of permeability from the surface to the depth.The research discovers that the cause of this phenomenon is the extremely developed factures in rock mass,and the faults with middle to high obliquity,which are of advantages for water storage and hydraulic transmission.In the identical elevation,the fault endpoints have tremendous influence to the permeability of rock mass,namely,the more intensive fault endpoints the rock mass contains,the more permeable the rock mass becomes.This is because of the stress concentration phenomenon in the fault endpoints,which causes the rock deformation and destroys the rock structures.Then,the interconnected cracks as the new transfusion channels make the permeability of the rock mass increased.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2010年第6期286-290,共5页
Earth Science Frontiers
基金
国家自然科学基金项目(40372134
40772208)
关键词
三峡工程
钻孔压水试验
岩体渗透性
Three Gorges project
borehole injection test
permeability of rock mass
