基于颗粒流方法的堆积层滑坡运动过程模拟

发布时间：2019-01-06 19:05

【摘要】：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。
[Abstract]:The failure mode and motion process of ten groups of accumulation landslide in Yangjiawan, Mian County, were studied by using discrete element method of particle flow. By comparing the macroscopic simulation parameters of rock and soil mass calibrated by PFC2D biaxial simulation test with the macroscopic measured parameters obtained from laboratory tests, the particle mesoscale parameters needed for the accumulation layer landslide are determined. Then the calibrated mesoscale parameters are substituted into the accumulation layer landslide model to simulate the failure mode and motion process of the landslide. The results show that the creep deformation accumulates in the initial stage, the landslide body squeezes the slope foot until the slope foot produces shear failure, and develops upward, which makes the whole landslide slide down and pile up on the slope foot along the contact surface. The result is basically consistent with the actual situation. It is considered that the method of particle flow is suitable for simulating the failure and movement process of accumulative landslide and has a certain reference significance for the prevention and treatment of this kind of landslide.
【作者单位】：西安科技大学地质与环境学院;
【基金】：国家自然科学基金项目(41302276) 西安科技大学博士(后)启动金项目(2015QDJ085) 国土资源部黄土地质灾害重点实验室开放基金项目(KLGLAMLR201603)~~
【分类号】：P642.22

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