Research On Mechanism Of1602(3) Working Face Support Crushing On Panyi Coal Mine

The bottom aquifer below the Cenozoic Quaternary of Huainan Anhui Coal Mine, has a direct impact on aquifer on practical production process, before leaving the60-80m waterproof coal (rock) column, resulting in substantial waste of resources. In recent years, due to shortage of coal resources, coal mine began mining for some original leaving waterproof pillar and dull coal, but coal mining in the adjacent aquifer spate of support crushing and water inrush accidents, causing major economic losses. Because of the overlying strata occurrence has certain difference compared with the deep buried coal seam on the adjacent aquifer, resulting in coal mining, the overburden rock caving characteristics have great particularity. In view of Panji No.1Coal Mine1602(3) working face pressure frame the disaster of water inrush problem related to mining, engineering geological characteristic analysis through in-depth investigation, collection, collation, the integrated use of theoretical analysis, numerical simulation and laboratory rock mechanics test, measurement means, then Panji No.1Coal Mine13-1coal seam overlying rock structure characteristic, the pressure frame mechanism of water inrush, reasonable working resistance of support and Countermeasures research.According to theoretical and simulated experiment research,we reveal that whether the loose layer is the existence of confined aquifer has great influence on the bedrock surface load, No confined aquifer,Since the beginning of the excavation,The vertical stress of bedrock layers of non-uniform distribution characteristics;With confined aquifer,vertical stress at the bedrock layer is almost not affected by excavation, Load unchanged, This is because a confined aquifer at the bottom of the loose bed have the effect of a uniform load, The bedrock under load is much larger in the absence of any confined aquifer. On the basis of Panyi Coal Mine13-1coal seam overburden structure classification,obtained by numerical simulation in the confined aquifer under the action of load transfer:when the hard rock lithology combination type structure and thickness of strata when certain conditions are met,hard rock easy compound breakage;in middle-hard rock structure initial rupture when the formation of asymmetric three hinged arch structure. These conclusions are applied to1602(3) working face,the overlying strata exist in hard and middle-hard rock structure, And to meet the conditions of hard rock compound breakage occurred,applying the key strata theory,established the first different overburden structure after the collapse of structure mechanics model,calculates the structure to prevent slipping instability reasonable working resistance of support are higher than the actual work support resistance,which is the result of1602(3) working face water inrush and pressure frame. The countermeasures are also put forward and applied pressure frame of water inrush in engineering practice, Good security economic and technological benefits can be obtained.