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根据赵家寨煤矿三软厚煤层12206工作面特定地质条件,通过煤柱强度经验计算公式计算出合理煤柱宽度留设尺寸,运用有限差分方法(数值模拟),研究分析了留设不同窄煤柱尺寸时相应的应力分布和围岩破坏状态。根据郑州矿区实际地质和工程实践情况,与理论计算结果相比较,综合分析得出极窄煤柱宽度取2 m时,即在稳定的内应力场范围内布置极窄煤柱护巷,能够明显提高巷道围岩稳定状态,并能保证工作面安全性和采出率;为郑州矿区三软煤层矿井下一步煤层开采区段煤柱尺寸合理留设提供了依据,对于提高回采率具有一定借鉴意义。
According to the specific geological conditions of 12206 working face of three soft thick coal seams in Zhaojiazhai Coal Mine, the reasonable size of coal pillar width is calculated by experiential formulas of coal pillar strength. The finite difference method (numerical simulation) Corresponding stress distribution and failure state of surrounding rock when column size. According to the actual geology and engineering practice in Zhengzhou mining area, compared with the theoretical calculation results, the comprehensive analysis shows that when the width of very narrow pillars is 2 m, the arrangement of very narrow coal pillar lanes in a stable internal stress field can be obviously Improve the stability of roadway surrounding rock and ensure the working face safety and recovery rate; provide a basis for reasonable size of coal pillar in the next coal seam mining section of three soft coal seam in Zhengzhou mining area, which has certain reference significance for improving recovery rate .