条带开采中煤柱稳定性分析

系统地分析了条带开采中煤柱稳定性问题。通过多个实例计算的对比分析，建议采用Ｗｉｌｓｏｎ强度公式进行一般地质采矿条件下条带煤柱强度的计算。从煤柱强度分析出发，导出了任意方向弱面的剪力强度安全系数计算式；建立了顶底板通过摩擦作用施加给煤柱的儿拉压应力引起的煤柱屈服区宽度变化的简化计算式；从３向受力状态角度分析了侧限力对增加煤柱强度的机理问题；还强调了煤柱载荷与采出率之间的非线性关系和条带开采设计中应注

PILLAR STABILITY ANALYSIS IN STRIP MINING

A systematic analysis of pillar stability in strip mining was made.It suggest that A. H.Wilson's formusa of pillar strength is to be adopted for the general geological and mining conditions based on case studies. The safety factor of shear strength at weak plane in any direction was deduced.The simplified formula for calculation of v.vriation of width of the yielded zone due to the friction effect between the roof or floor and coal pillar was also proposed. The mechanism of increasing the strength of coal pillar by confined pressure was investigated under triaxial stress conditions. The authors concentrated on the non-linear relationship between pillal load and the extraction ratio. Several problems in strip mining design were pointed out.