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某水电站进口侧山体边坡岩体为完整性较差的中-薄层状灰岩,岩体中主要发育3条断层、1组岩脉和4组优势节理,严重影响了该山体边坡的稳定性。根据结构面分布,采取块体理论搜索边坡上的关键块体,通过赤平投影法找出边坡上所有的非空裂隙锥,将这些非空裂隙锥与临空面组合,从而获得所有可动块体;利用矢量法计算不同运动形式下块体JP编号、净滑力即可获得关键块体。结果表明:该水电站引水洞进口侧山体边坡有4块关键块体(JP编号为00010111、00110111、10110111、10111011),为该边坡稳定性的进一步研究提供了基础。
The mountain side slope rock mass on the inlet side of a hydropower station is a poorly integrated medium-thin layer limestone. There are mainly three faults, a group of dikes and four groups of dominant joints in the rock mass, which seriously affect the slope stability. According to the distribution of structural planes, the block theory is used to search for key blocks on the slope, and all the non-empty fracture cones on the slope are found by the stereographic projection method. These non-empty fracture cones and the free surface are combined to obtain all Moving blocks; using vector method to calculate the JP number of blocks under different forms of motion, net slip force to obtain key blocks. The results show that there are 4 key blocks at the inlet side of the diversion tunnel (JP No. 00010111,00110111,10110111,10111011), which provide a basis for further study on the stability of the slope.