粗粒土堆积体塌滑特性试验与数值研究
Experimental and numerical studies on sliding and scattering characteristics of coarse-aggregate soil mass

摘要 基于室内物理模型试验，研究粗颗粒土沿斜面塌滑、蔓延和堆积的整个运动过程；分析粗粒土堆积体初始状态、颗粒粒径、斜面倾角等因素对塌滑体的最终堆积状态参数(主要包括冲程，最大堆积厚度及其位置)的影响.基于离散单元数值分析方法，采用颗粒流程序软件，编写粗粒土堆积体塌滑运动的模拟程序，开展粗粒土堆积体塌滑过程的研究，数值模拟与室内试验结果基本一致.研究结果表明：堆积体最终状态几乎不受初始状态的影响；斜槽倾角对堆积体滑落稳定后最大堆积厚度所在水平位置影响较大，根据数值计算结果，拟合出斜槽倾角与最大堆积厚度所在水平位置的关系式；斜槽倾角对最终堆积形态有着较大的影响；随着斜槽倾角和粒径的增大，堆积体的冲程、最大堆积厚度的位置与坡角的距离增大，最大堆积厚度减小.
Abstract：Based on indoor physical model test, the whole process of the collapse, slip and accumulation of coarse-grained soil along the slope is studied. The influences of some factors on the final accumulation state parameters(mainly including the stroke, the maximum stack thickness and its position)of the soil mass in slumping process are investigated in this paper,these factors include the initial state , particle size and slope angle of coarse-aggregate soil mass. Based on the discrete element numerical analysis method, the particle flow software is used to compile the simulation program of the collapsing movement of coarse-aggregate soil mass. Furthermore, the research on the collapse process of coarse-aggregate soil mass is carried out. The numerical simulation is basically consistent with the indoor test results. The results show that the final state of the deposit is almost unaffected by the initial state; the inclination of the chute has great influence on the horizontal position of the maximum accumulation thickness when the accumulation body is stable. According to the numerical calculation results, the relation between the inclined chute angle and the horizontal position of the maximum accumulation thickness is calculated. The inclination angle of the chute has great influence on the final accumulation form; as the inclination angle and the particle size increase, the stroke and the range of the maximum accumulation thickness increase,while the maximum accumulation thickness decreases.