淮北矿业许疃煤矿7煤层煤与瓦斯突出危险性临界深度分析

Analysis of Coal and Gas Outburst Critical Depth of 7 Coal Seam in Xutuan Coal Mine, Huaibei

摘要: 通过对许疃矿8₁、8₂采区及8₂下延采区范围内7煤层瓦斯基础参数的实验测试，获得了突出危险性评价指标值，结合研究区以往的有关数据，对煤与瓦斯突出危险性及突出临界深度进行了评价。经统计及计算，推测−620 m标高时瓦斯压力达到突出临界值，瓦斯含量接近突出临界值，实测瓦斯放散初速度最大为11 mmHg，超过了突出临界值，推算煤坚固性系数在标高低于−464 m时将达到突出临界值，研究区地质破坏带的煤体破坏类型为III~IV类。综合分析认为研究区瓦斯突出危险性临界深度应不低于−620 m标高，基于安全考虑，建议以−615 m作为生产中采用的瓦斯突出危险性临界深度。

Abstract: The outburst risk evaluation index value was obtained through the testing experiment of 7 coal seam gas basic parameters of 8₁, 8₂ mining area and 8₂ extension in Xutuan coal mine, the risk of coal and gas outburst and the critical depth of outburst were evaluated based on the previous data. By statistics and calculation, it was inferred that in the −620 m elevation the gas pressure would reach the critical value, the gas content was close to the critical value and the measured gas initial velocity exceeded the critical value which was 11 mmHg, in the elevation that was less than −464 m the coal sturdiness coefficient would reach the critical value and the type of coal damage in the geological failure zone of the study area was III - IV. Comprehensive analysis showed that the critical depth of gas outburst risk in the study area should be no less than the −620 m elevation, and the −615 m elevation was proposed as the critical depth of gas outburst risk which was used in the production based on safety consideration.