Research on the Development Height Detection of the"Two Zones"of Overburden Rock in Coal Mining Faces
After coal seam mining,overlying rock deforms,moves and destroys and forms"two zones"(caving zone and water-conducting fracture zone).When the"two zones"communicate with the upper aquifer,there will be a close hydraulic connection between the communicating aquifer,which will have a great impact on the mining of coal mine.Taking the 111211 working face of Yinxing No.1 well in Ningxia as the research object,this paper studies the deformation and failure law of overlying rock under the condition of mining of 12th coal seam and determines the development height of"two zones"of 12th coal seam by means of drilling coring,observation of the consumption of drilling washing liquid,drilling color TV image measurement,calculation and verification of the current standard formula.The research results show that the height of the water-conducting fracture zone after the 12th coal seam is 53.35 m,and the fissure ratio is 15.69∶1.The caving zone is 12.79 m high and the caving ratio is 3.76∶1.The research results provide the basis and guidance for the identification of water filling source of mining face,the assessment of the influence of overlying aquifer on water filling of mining face,the design of water-proof coal(rock)column and the prevention and control of water disaster of coal face roof.It is of great significance to realize the safety production under water body,improve the production capacity of coal mine and the level of safety production management.
working faceoverburden rockdevelopment height of the"two zones"detection research
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