论文部分内容阅读
大光包滑坡为汶川地震触发的最大规模滑坡,是典型的结构面控制型的滑坡。本文以其为地质原型,考虑其坡体结构和地形地貌,建立起数值计算模型,对其进行全过程动力模拟,对坡体的应力演化过程进行全程分析,从力学演化过程来解释斜坡的地震变形破坏机制。结果表明:斜坡的应力演化特征对其变形破坏过程起控制性作用,对于结构面控制型的斜坡来说,结构面的应力状态控制着斜坡的变形破坏,斜坡破坏前,坡体的应力特征表现出整体性,结构面处的应力特征与坡体较为一致,表现出控制性作用;在结构面破坏后,其控制作用明显减弱。对于结构面,其前缘破坏以剪切破坏为主,后缘为拉张和剪切复合型破坏。
The largest scale landslide triggered by the Wenchuan earthquake in the Daguangbao landslide is a typical structure-controlled landslide. In this paper, taking it as a geological prototype, taking into account the slope structure and topography, a numerical model is established, and the whole process of dynamic simulation is carried out. The whole process of stress evolution is analyzed, and the slope seismic Deformation and destruction mechanism. The results show that the stress evolution of the slope plays a controlling role in the deformation and failure process. For the slope controlled by the structural plane, the stress state of the structural plane controls the deformation and failure of the slope. Before slope failure, the stress characteristics of the slope Out of the whole, the stress characteristics at the structure plane are more consistent with the slope body, showing a controlling role; the control effect is obviously weakened after the structural plane failure. For the structural plane, the failure of the leading edge is dominated by shear failure, and the trailing edge is the composite damage of tension and shear.