In order to solve the problem of mine water hazard caused by the failure of roof overburden,taking the first and second horizontal working faces of A Coal Mine as the engineering background,the development height characteristics of the water conduction fracture zone under the mining conditions of multiple coal seams in the coal mine were analyzed by using mechanical theory analysis and numerical simulation,and the migration characteristics of overburden at different distances of coal seam mining in 9#coal seam were discussed.The results showed that during the repeated mining process after the completion of 4+5#and 8#coal seams,the water conducting fracture zone of 9#coal seam was connected to 8#coal seam.The inclined length of 9#coal seam was 200 m,and the height of water conducting fracture zone development caused by coal cutting and mining in the working face was about 144.95 m.The impact on the height of water conducting fracture zone development in 8#coal seam was not significant,but it had a certain impact on the height of water conducting fracture zone development in 4+5#coal seam.The study on the development height of roof water conducting fracture zones under complex mining conditions has important practical significance for guiding mine safety production and preventing mine water hazards.
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