基于分区有限元与块体界面元混合法的强度折减边坡稳定分析法

考虑到岩质边坡失稳的连续—非连续特征,采用基于分区有限元与块体界面元混合法的强度折减法,对索风营Dr2危岩体进行稳定性分析。先应用有限元强度折减法搜索最危险滑动面,再利用分区有限元与块体界面元混合法在滑动面上生成接触点对,模拟滑动面破坏情况,然后结合强度折减法,定义接触点对全部失效时边坡失稳,计算安全系数值。结果表明,基于分区有限元与块体界面元混合法的强度折减法能够解决岩质边坡局部位移非连续问题,有效避免了目前强度折减法失稳判据的人为性,且只在滑动面上进行非线性迭代,计算效率明显提高。

Slope Stability Analysis Using Strength Reduction Method Based on Hybrid Interface Boundary Elements and Partitioned Finite Elements

Considering the continuous-discontinuous characteristics of rock mass slope instability, a strength reduction method based on the interactive method of interface boundary elements and partitioned finite elements was used to analyze the stability of Dr2 rock mass in Suofengying Hydropower Plant. After searching the most dangerous sliding surface by the finite element strength reduction method, the interactive method of interface boundary elements and partitioned finite elements was applied to generate nodal pairs for simulating the damage states of the sliding surface. Then the strength reduction method was used to calculate the safety factor by defining the states of all nodal pairs at the failure state. The results show that the proposed method can solve the problem of local continuous-discontinuous deformation in rock mass slope, and effectively avoid the effect of subjectivity in determining the safety factor with current strength reduction method. In addition, the nonlinear iteration was only performed on the sliding surface, and the efficiency of calculations was improved significantly.