Study on development characteristics of water-conducting fracture zone in overlying rock under complex geological conditions in Binchang mining area
Yadian Coal Mine in Binchang mining area mainly mines 1 coal and 4 coal,and adopts two mining methods of one-time full-height mining and fully-mechanized caving mining respectively.In order to study the failure law of overlying strata under different min-ing methods,taking ZC1101 working face and ZF1405 working face of Yadian Coal Mine as examples,the development height of water-conducting fracture zone under different mining methods is calculated by empirical formula,numerical simulation and field measure-ment,and the permeability change law of roof aquifer after coal seam mining is studied by means of borehole dewatering head water in-jection test.The results show that the development height of water-conducting fracture zone is 113 m under the condition of one-time full-height mining.The crack-mining ratio is 37.7 times.Under the condition of fully-mechanized caving mining,the development height of water-conducting fracture zone is 245 m,and the crack-mining ratio is 21.5 times.After coal seam mining,the permeability coeffi-cient of overlying aquifer increases by 5～10 times due to mining failure.The research results can be used as an important basis for the formulation of technical measures for water prevention and control in mines,and can also enrich the database of the height development of water-conducting fracture zones in Binchang mining area.
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