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对澜沧江上游某水电站下坝址两岸高边坡坡表地质调查,发现边坡存在一种倾倒—滑移—倾倒的特殊组合倾倒模式。结合离散元数值模拟分析,发现其变形破坏过程为下部岩体在自重及上覆岩体的压力作用下向临空面倾倒折断、中部岩体在平行于坡面的不连续结构面拉裂贯通后向下产生滑移并为上部岩体腾出空间、上部岩体在自重作用下发生倾倒弯曲破坏,整个变形破坏为先下部后上部的顺序,各部分变形产生的位移从下至上逐渐减小,该结论为类似工程的开挖提供了理论依据。
A geotechnical investigation of the high slope on both banks of the upper reaches of the Lancang River downstream of a dam shows that there is a special combination dumping mode of dumping-sliding-dumping on the slope. Combined with discrete element numerical simulation, it is found that the deformation and failure process of the lower part of the rock mass is that the lower rock mass collapses to the free surface under the pressure of self-weight and the overlying rock mass, and the middle rock mass breaks through the discontinuous structure surface parallel to the slope surface The slip of the upper part of the rock mass and the space of the upper part of the rock mass are made. The rock mass in the upper part undergoes overturning and bending failure under its own weight, and the whole deformation failure is the order of the upper part and the lower part of the upper part. The displacement of each part of the deformation gradually decreases from the bottom up This conclusion provides a theoretical basis for the excavation of similar projects.