论文部分内容阅读
长壁开采后遗留了大量的不规则块段,回收这部分煤炭资源主要是通过以连续采煤机为主的短壁块段式开采。区段保护煤柱的稳定与否是不规则块段安全开采的关键。根据同煤集团某矿2-2上煤层的地质条件,运用突变理论分析了煤柱失稳机理,推导出区段煤柱发生突变失稳的必要条件为煤柱屈服区宽度大于煤柱总宽度的86%,数值模拟计算结果验证了该结论,并直观地模拟了煤柱与采场变形破坏的动态演化过程。通过在该矿区段煤柱的应用实施,煤柱不发生突变失稳的理论计算结果为其塑性区宽度不得大于12.9 m,现场钻孔窥视实测结果验证了该结论。
After the longwall mining, there are a large number of irregular blocks left behind. The recovery of this part of coal resources is mainly through the short wall block mining with continuous shearer. The stability of section protection pillars is the key to the safe mining of irregular blocks. According to the geological conditions of the upper coal seam of a coal mine in Tongmei Group, the catastrophic theory of catastrophe is used to analyze the instability mechanism of coal pillar, and the necessary conditions for catastrophic failure of the coal pillar in a section are derived. The width of yield zone of coal pillar is larger than the total width of coal pillar 86%. The numerical simulation results verify this conclusion and visually simulate the dynamic evolution of coal pillar and stope deformation and failure. Through the application of the pillars in the mine section, the theoretical calculation results of the pillars without sudden failure are as follows: the width of the plastic zone should not be larger than 12.9 m, and the conclusion is verified by field drilling and peering survey.