应用物理模型和三维非连续变形分析方法分析楔形体破坏

PHYSICAL MODELING AND THREE-DIMENSIONAL DISCONTINUOUS DEFORMATION ANALYSIS OF WEDGE FAILURE

目前,大多数学者都采用极限平衡方法分析岩体中楔形体的稳定性,但这些极限平衡方法都有一些局限性.建立物理模型系统研究楔形体破坏,并应用三维非连续变形分析(DDA)方法分析这些物理模型,结果显示,三维 DDA不仅给出了与物理模型试验相同的楔形体破坏模式(包括复杂的破坏方式、扭转滑动破坏),而且给出的楔形体随时间的运动轨迹亦相同。因此,发展的三维 DDA 由于考虑动力平衡和所有破坏模式(包括复杂的旋转破坏模式),可作为常规分析楔形体稳定性的方法.

The failure of a block or wedge of rock in discontinuous rock mass has been analyzed by many researchers,mainly based on the limit equilibrium approach.A review of existing limit equilibrium analysis methods shows some limitations.To address these limitations,physical models have been built to study wedge failure systematically.In addition,the physical models have been analyzed by three-dimensional discontinuous deformation analysis(3D DDA).The results show that physical modeling and 3D DDA give the same behavior in all cases,including a case involving torsional sliding.Moreover,3D DDA results agree well with physical modeling results in terms of the time history of block movement.This shows that the 3D DDA developed can potentially be used as a general stability analysis of a wedge because it considers dynamic equilibrium and general failure modes including rotational ones.