倾斜基底排土场抗滑煤柱稳定性计算方法

Stability Calculation for Anti⁃slide Coal Pillar in Dump with Inclined Foundation

针对露天矿倾斜基底排土安全防护问题,分析了倾斜基底排土方式、变形特征及滑动模式,建立了倾斜基底模型与抗滑煤柱模型,分析了抗滑煤柱稳定评价方法和排土台阶边坡稳定系数影响因素。结果表明,抗滑煤柱稳定性由煤柱内摩擦角θ岩和排弃物料安息角θ排之间关系决定;当θ岩≥θ排时,随煤柱长度增加,排土台阶边坡稳定系数增大;当θ岩<θ排时,随煤柱长度增加,排土台阶边坡稳定系数呈增大、减小、再增大的变化特征。

In consideration of safety problem of landfilling into a dump with inclined foundation in an open⁃pit mine,an inclined foundation model and an anti⁃slide coal pillar model were established based on the analysis of landfilling methods in such inclined dump,deformation characteristics and sliding mode of inclined foundation,and then the method for evaluating stability of anti⁃slide coal pillar and influencing factors of the stability coefficient of dump slope were all discussed.The research results show that the stability of anti⁃slide coal pillar mainly depends on the relationship between the internal friction angle of coal pillar and the rest angle of waste material.When the internal friction angle is greater than or equal to the rest angle,the stability coefficient of dump slope increases with an increase in the length of anti⁃slide coal pillar;while when the internal friction angle is less than the rest angle,the stability coefficient of dump slope increases first,then falls down and finally increases again as anti⁃slide coal pillar becomes longer.