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基于降雨入渗对煤矿矸石山边坡稳定性的显著影响,建立了矸石山边坡降雨入渗的计算模型及对解法编制了MATLAB计算程序,计算了边坡在降雨后的瞬态含水率,运用极限平衡法和FLAC数值模拟法,对矸石山边坡进行了降雨前后的稳定性对比分析。研究表明:降雨入渗只影响边坡以下3 m深度的含水率,易发生表层滑坡;降雨入渗降低了边坡土体的内摩擦角和黏聚力,减小了边坡的安全系数;降雨后边坡体的最大位移及位移分布、最大剪应变及剪应变分布和塑性区均有明显的增加,边坡稳定安全储备显著降低。
Based on the significant influence of rainfall infiltration on slope stability of coal gangue slope, a calculation model of rainfall infiltration on slope of waste rock slope was built and a MATLAB calculation program was compiled for the solution. The transient moisture content of slope after rainfall was calculated, By using the limit equilibrium method and the FLAC numerical simulation method, the stability of the gangue slope was compared before and after rainfall. The results show that rainfall infiltration only affects the water cut at depth of 3 m below the slope, which is prone to surface landslides. Rain infiltration reduces the internal friction angle and cohesion of slope soils and reduces the safety factor of the slope. After rainfall, the maximum displacement and displacement distribution, the maximum shear strain, the distribution of shear strain and the plastic zone of the slope body obviously increase, and the safety reserve of slope stability decreases significantly.