基于颗粒流方法的堆积层滑坡运动过程模拟

以颗粒流离散元为研究方法对勉县杨家湾十组堆积层滑坡破坏方式与运动过程进行数值模拟研究。通过PFC2D双轴模拟试验所标定的岩土体宏观模拟参数与室内试验所获取的宏观实测参数进行对比，确定堆积层滑坡所需的颗粒细观参数，然后将标定的细观参数代入堆积层滑坡模型，对滑坡破坏方式及运动过程进行模拟研究。结果表明:滑坡破坏在初始阶段蠕滑变形累积，滑坡体挤压坡脚，直至坡脚产生剪切破坏，并向上牵引发展，使得滑坡整体顺接触面破坏下滑并堆积于坡脚，表现为典型的牵引式渐进破坏，结果与实际情况基本吻合。研究认为，采用颗粒流方法对堆积层滑坡破坏与运动过程的模拟研究具有较高的适用性，对该类滑坡防治具有一定的参考意义。 

Simulation on the movement process of accumulated layer landslide based on PFC2D

The particle flow discrete element method to research ten groups of Mian County Yangjiawan accumulated layer landslide failure mode and the movement process was studied by numerical simulation. By comparing the simulation parameters of rock and soil mass calibrated by PFC2D biaxial simulation test and macroscopic parameters measured in laboratory experiments, the meso parameters of accumulated layer landslide were determined. Then, the calibrated meso parameters were applied to the accumulated layer landslide model, simulation study on the failure mode and movement process of landslide. The results show that the cumulative creep deformation of landslide in the initial stage, landslide body extrusion toe, the shear failure, and upward traction development made the whole landslide along the contact surface damage decline and accumulation in the slope toe, showing a typical traction type progressive failure, results are basically consistent with the actual situation. The results show that the applicability of the simulation of the particle flow method of accumulated layer landslide failure and the movement process is high, the landslide prevention and control have a certain reference value.