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边坡开挖为边坡岩体中的岩石块体创造了新的临空条件,块体的初始稳定状况受到了外界影响,因此需要重新对结构面组合块体稳定性进行评价。通过对金川水电站左岸引水发电系统进水口边坡的岩性、构造、变形失稳机制以及岩体质量和力学参数的研究,利用空间坐标建立了边坡和结构面的三维地质模型,结合边坡的开挖设计,进行平行和垂直轴向边坡方向的剖切,从而得到块体组合情况。然后,利用商用岩石边坡块体稳定性计算程序对各潜在不稳定块体进行计算。计算结果表明:除了在极端的工况下局部块体会失稳外,其它块体均较稳定。
The excavation of the slope creates a new condition for the rock mass in the rock mass, and the initial stability of the block is influenced by the outside world. Therefore, the stability of the composite block of the structural plane needs to be re-evaluated. Through the research on the lithology, structure, deformation and instability mechanism and rock mass quality and mechanical parameters of the inlet of the left bank diversion system of Jinchuan Hydropower Station, the 3D geological model of slope and structural plane is established by using the spatial coordinate. Combined with the slope Of the excavation design, parallel and vertical axial direction of the slope of the cut, resulting in block combinations. Then, using the commercial rock slope block stability calculation program to calculate the potential of each unstable block. The calculation results show that all the blocks are stable, except that the local blocks will be unstable under the extreme conditions.