端帮采场边坡稳定影响因素及其作用规律研究
Study on influencing factors and action law of slope stability in end-slope mining field
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摘要: 受“边坡应力场”与“采硐群应力场”耦合作用的影响，端帮采场边坡稳定影响因素更加复杂，边坡稳定控制难度显著提高。为了探明端帮采场边坡稳定性的主要影响因素及其作用规律，以我国鄂尔多斯地区某露天矿端帮采煤为背景，构建数值分析模型，模拟研究了不同边坡角、不同煤柱宽高比和不同采硐深度工况条件下边坡岩土体的移动变形特征，对比分析了各关键因素对边坡稳定影响的差异性。结果表明：整体边坡角、煤柱宽高比和采硐深度对端帮采场边坡岩土体移动变形影响明显；边坡稳定性随整体边坡角增大而降低，随煤柱宽高比增大而提高；以坡顶线在煤层的正射投影位置为界，当采硐末端未超出该边界时，采硐深度的增大不利于边坡稳定，当采硐末端超出该边界时，采硐深度继续增大将有利于边坡稳定。Abstract: Influenced by the coupling effect of “slope stress field” and “roadway group stress field”，the influencing factors of slope stability in end-slope mining field are more complex and the difficulty of slope stability control is significantly increased. In order to find out the main influencing factors and action rules of slope stability in end-slope mining field, taking the end slope coal mining of an open-pit mine in Ordos area as the background, numerical analysis model was constructed, the movement and deformation characteristics of slope rock and soil mass under different slope angles, different width-height ratios of coal pillars and different mining depths are simulated and studied, and the differences of the influence of each key factor on slope stability are compared and analyzed. The results show that the overall slope angle, the width-height ratio of coal pillar and the depth of mining roadway group have obvious influence on the movement and deformation of rock and soil mass of slope in end-slope mining field. The slope stability decreases with the increase of the overall slope angle, increases with the increase of width-height ratio of coal pillar, and taking the orthographic projection position of the slope top line in the coal seam as the boundary, when the end of roadway does not exceed this boundary, the increase of roadway depth is not conducive to slope stability, when the end of roadway exceeds this boundary, the increase of roadway depth will be beneficial to slope stability.
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