近距离煤层开采上覆采空区火区探测及治理

近距离煤层的层间距非常小,煤层开采过程中漏风现象突出,煤炭容易发生自燃。针对海则庙煤矿工作面开采前期出现CO大量涌出的异常情况,采用同位素测氡法对该矿盘区工作面上覆地表区域进行火区探测,共探测出4个高温异常区域,其总面积为2100 m^2。制订了煤自燃动态监测、采空区注胶堵漏的防灭火技术措施,措施实施后工作面回风流和上隅角的CO体积分数均降至正常水平,有效控制了采空区煤自燃火灾,为工作面的安全回采提供了保障。

Fire detection and control of overlying goaf in close-distance coal seam mining

The distance between layers of close-distance coal seam is very small,the phenomenon of air leakage is prominent in the process of coal seam mining,and the coal is prone to spontaneous combustion.In view of the abnormal situation that a large amount of CO gushing in the early stage of mining in Haizemiao Coal Mine,the overlying surface area of the panel working face in the mine was detected by the isotope radon measurement method for fire detection,a total of 4 high temperature abnormal regions with a total area of 2100 m^2 were detected.Fire prevention and extinguishing technical measures such as dynamic monitoring of coal spontaneous combustion and injecting glue in goaf were worked out.After the implementation of the measures,the volume fraction of CO in the air return and upper corner decreased to the normal level in the working face,it indicated that the spontaneous combustion of coal was effectively controlled,which provided a guarantee for the safe mining in the working face.