Study on the influence of faults in coal seam groups on the evolution of mining-induced fractures

Abstract

To study the influence of faults on the evolution of mining fissures in coal seam group, the mining fissure evolution of coal seam group containing faults was investigated based on similar simulation and numerical simulation methods by taking 151710 working face of Tucheng Coal Mine in Guizhou Province as the research object. The results show that the stress distribution around the working face is significantly different when the No.9 and No.12 coal seams in coal seam group containing faults are mined to the same distance; the advance mining of No.9 coal seam makes No.12 coal seam in the stress reduction zone, and the stress zoning phenomenon appears before and after the working face crosses faults; with the progress of mining, the mining influence range of No.12 coal seam is less than that of No.9 coal seam; when the mining face crosses the fault, the overlying rock cracks develop rapidly, there is significant separation between the rock layers, and different degrees of fractures occur. The drilled and peered resule from roof of return air lane of No.12 coal seam shows that when the working face crosses the fault, the roof is broken seriously and the overlying rock fissure develops disordered.

Keywords

• mining-induced fissure
• fault
• coal seam group
• fracture evolution
• similar simulation
• numerical simulation