基于PFC2D边坡失稳破坏研究

Particle Flow Simulation of Slope Instability and Failure Based on PFC2D

采用颗粒流离散元数值方法对典型边坡算例失稳变形破坏过程进行计算模拟,模拟中利用数值试验方法建立起宏观与微观力学参数关系,进而确定计算用微观参数。计算结果与典型考核算例基本吻合,从而说明计算的有效性,同时计算表明利用PFC2D方法可以自动搜索确定失稳滑移面,表现破坏发展过程,在破坏过程中黏土力链不断断裂,但由于滑动摩擦和颗粒间接触作用仍能维持部分黏土力破坏区域岩土体的稳定,因而黏土力断裂区域范围大于失稳范围,从而提高了对边坡失稳的认识。

The instability and deformation process of an example of slope is simulated using PFC2 D here. The relationship between macro and micro mechanics parameters is established in the numerical simulation,which determines the calculating parameters. The results of simulation and the example are consistent assessment,which illustrates the effectiveness of calculation,indicates that the PFC2 D method can search the instability and sliding surface and show the development process of performance failure. During the process,the chain of parallel bond force fracture gradually. But parallel bond fracture area is larger than the instability range because of the sliding friction,which improves our understanding of slope instability.