浅埋厚煤层区段煤柱合理尺寸优化与研究

Optimization and research of rational size of section coal pillar in shallow-buried thick coal seam

针对浅埋厚煤层区段煤柱合理尺寸留设难题,结合某矿具体实际工程地质条件,采用理论分析、数值模拟和现场工业性试验等手段,从煤柱支承应力和塑性区分布等方面进行了研究。结果表明:随着煤柱尺寸的减小,支承应力集中程度逐渐增大,且出现支承应力最大值的位置越靠近采空侧;当煤柱尺寸过小时,巷道周围塑性区与煤柱内塑性区连接,不利于巷道稳定;综合理论分析计算、数值模拟和经济角度考虑确定煤柱合理的留设尺寸为12m。现场工业性试验验证了12m宽煤柱巷道变形量能够满足安全生产的要求。

Aiming at the problem of rational size of section coal pillar in shallow-buried thick coal seam, combined with prac- tical engineering geological conditions, distribution rules of coal pillar bearing stress and plastic zone were studied by theoretical a- nalysis, numerical simulation and field industrial tests. The results showed that the concentration degree of bearing stress in- creased with the decreasing of pillar size, and the location of maximum bearing stress was more close to goal; when the pillar size was too small, the plastic zone around roadway was connected with the plastic zone in pillar, which was against roadway stability; in the end, combined with the results of theoretical analysis and calculation, numerical simulation and economy analysis, the ra- tional width of coal pillar was determined as 12 m. The industrial tests verified that the roadway deformation could meet the re- quirement of safety production.