煤层地质异常区域掘进防突技术

Outburst Prevention Technique for Drivage in Abnormal Zone of Coalbed Gas Geology

针对瓦斯地质异常区域煤层特点,分析了异常区域执行防突措施存在的问题;研究了地质构造异常区域防治煤与瓦斯突出的技术原理、方法;确定了预测突出危险性指标;应用地质前探、超前排放、浅孔抽放瓦斯和卸压综合防突方法,现场实践表明,在突出危险性较大的煤层地质异常区域进行卸压、排放瓦斯,使原始高地应力场发生改变,并使高地应力场沿巷道掘进方向向前方煤体和巷道两帮深部转移,提高了煤层透气性,减少了突出势能,能够有效防治煤与瓦斯突出。

To counter the characteristics of coal seams in the abnormal zone of coalbed gas geology,this paper analyzed the problems present in taking outburst prevention measures in the abnormal region,made study of the technical principle and measures of coal and gas outburst prevention and control in the abnormal zone of geological structure,determined the index for outburst hazard prediction,and put forward complex outburst prevention measures including advance geological exploration,advance gas discharge,gas drainage by shallow holes and pressure relief.On-the-spot application showed that the application of pressure relief and gas discharge in the abnormal zone of coalbed gas geology with larger outburst hazard can change original high strata stress field and make the high strata stress field to transfer along the driving direction of roadway into the front coal body and the deep part of two sides of roadway,this thus increased the gas permeability of coal seams,reduced the potential energy of outburst and can effectively prevent and control coal and gas outburst.