Research On Prevention Of Pressure Bump In KuanGou Coalmine

The pressure bump mines Dynamic Disasters of phenomena has been one of the difficulties of rock mechanics and mining disaster. This article wide ditch gently inclined seam of rock burst prevention and control as the background and comprehensive utilization of theoretical analysis, numerical simulation, field measurement methods and means for the wide ditch W1143face the actual geological mining conditions, analysis of pressure bump the incentive to take local the bursting of the global water injection for rockburst prevention, and achieved good application effect has important theoretical significance and wide application prospect. Innovative work and achievements include the following aspects:(1) by a wide ditch stamping factors, including the mining depth, coal or rock burst tendency of the causes of the phenomenon of roof dynamic pressure and fault zone, draw a wide ditch rockburst is mainly due to the coal seam roof for the large thickness of the high-intensity hard the roof, forming a large area hanging arch itself easily accumulate a lot of flexibility, in the roof breakage or slippage, a lot of flexibility can be a sudden release, will have a strong rock vibration caused by impact pressure.Cuttings method for monitoring and borehole method.(2) the wide ditch coal the W1143mining face impact pressure monitoring, inspection, according to the analysis of field monitoring results, carved out of the the W1143Face the occurrence of rockburst hazardous area.(3) promote the wide ditch coal caving mining face during the stress field of study, and FLAC3D software for stress analysis, drawn wide coal mine rockburst occurred face ahead of the coal wall stress concentration ahead of the coal wall, roof strata caused by pressure to the face and faults of coal pillar, resulting in the fault region the formation of stress concentration, resulting in biased and to pressure.(4) before and after the injection of the wide groove roof roof caving situation numerical simulation obtained injection before the roof to the initial pressure step for the120m, take off the block greater support pressure40Mpa, goaf in such a large flap top the subtalar initial caving mine to stope pressure is great, water, roof to the initial pressure step is80m, take off the block is small, the support pressure is25Mpa, goaf suspended zenith distance is relatively small, and caving fragmentation loose, even breaking down, nor will it face to cause much harm.(5) through the field and theoretical analysis, Destress Blasting ahead, the technical measures for prevention and control of the global water injection pressure bump into the field test, and achieved the desired results.