Migration law of remaining top coal and fire control technology in fully mechanized caving face with steeply dipping coal seam
In order to study the migration law and crack propagation of the remaining top coal in the fully-mechanized caving face with steeply dipping coal seam,the Zhonger 401 working face of Wangjiashan Coal Mine of Jingyuan Coal Industry Group was taken as the research object,and the physical similarity simulation experiment and numerical simulation experi-ment were combined to analyze the migration and crack development law of the remaining top coal in the fully-mechanized caving face with steeply dipping coal seam.The results show that the crushing and migration of the remaining top coal in the fully mechanized caving face with large dip angle are asymmetric,and the stress and displacement in the middle and lower part of the inclined working face are greater than those in the upper part.The remaining top coal in the goaf presents an al-ternating accumulation form of'top coal-direct top-top coal'along the inclined direction,and the accumulation amount in the inclined lower part is greater than that in the inclined upper part.The fracture development range of overlying rock is wide,which can be extended to No.3 coal seam with the advance of working face.The"two-stage"fire prevention and ex-tinguishing technical measures are put forward based on the characteristics of residual coal,which achieves good fire prevention and extinguishing effect and ensures the safe and efficient production of working face.
steeply dipping coal seamfully mechanized caving faceremaining top coalfire prevention and extinguishing technology
国家科技期刊平台
NSTL
万方数据
维普
