某水电站引水洞进口侧山体边坡块体识别

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。

Block recognition of mountain slope in delivery tunnel inlet side for a hydropower station

The slope rocks of delivery tunnel inlet side of a hydropower station are middle-thin layered limestone,in which there are mainly three faults,one dyke and four groups of superior joints.The characters seriously effect the stability of this mountain slope.According to the distribution of structural surfaces,the authors use block body theory to search of the key block bodies in the slope.The non-spatial fracture cones in the slope were find out by stereographic projection law.Combined them with free surface to get the whole movable block bodies,the authors calculated the JP number and the net sliding force under different movable forms to find out the key block bodies.The result indicates that there are 4 key block bodies in the slope of delivery tunnel inlet side of this hydropower station,with the JP numbers 00010111,00110111,10110111 and 10111011,which proves the base for further examination of the slope stability.