区段煤柱弹塑性宽度计算及其应用

Calculation and Application on Elastic-plastic Coal Pillar Width of the Stope

基于主应力影响的黏性材料SMP屈服准则,分别考虑采空区侧和巷道围岩2种不同受力环境,得出了2种条件下的煤柱宽度的计算公式,同时采用极限平衡理论推出平面应变下煤柱塑性区宽度的理论公式,并通过改变煤体的内摩擦角和内聚力,与以Mohr-Coulomb准则计算所得煤柱塑性区宽度比较表明,采用传统方法未能充分考虑煤体的极限强度,使得煤柱尺寸的设计较为保守,而基于黏性材料的SMP准则下的煤柱宽度计算能很好地符合实际,对于提高矿山开采效率具有显著意义。

Based on the SMP failure criterion of clay materials affected by the principal stress,and considering stress conditions on goaf and roadway,the formula of the coal pillar width under two conditions is obtained.In the meantime,the plastic-zone width of the coal pillar in plane strain is inferred by using the limit equilibrium method.Compared with results obtained by Mohr-Coulomb failure criterion by changing the coal internal friction angle and cohesion,it shows that the traditional approach failed to make fully consideration of ultimate strength of the coal,and coal pillar size was designed conservatively.The calculation on coal pillar width based on SMP failure criterion is not only effective,but it will take an important significance in improving the production efficiency of the coal mine.