Research on the Height and Law of Overlying Rock Failure During the Mining of Thin Coal Seams in Taiyuan Formation of Tengxian Coalfield
The lower formation coal seam in Tengxian Coalfield is a typical deep buried thin coal seam,and the development law of water conducting fracture zones is not obvious,making it difficult to predict the height.In order to study the development situation of water conducting fracture zones and the law of overlying rock failure in Tengxian Coalfield,taking the 21603 working face of Binhu Coal Mine as the research object.Theoretical formulas and 3DEC numerical simulation methods are used to study the fracture height and law of overlying rock after mining and excavation disturbance,and the"double end sealing side leakage"measurement method is used for verification.3DEC numerical simulation determines the influence of mining and excavation disturbance on the development height of water conducting fracture zones from multiple perspectives by analyzing the characteristics of fissures development,plastic zone deformation,roof and floor stress distribution and displacement monitoring.The research results indicate that the measured height of the overlying water conducting fracture zone in the 21603 working face of Binhu Coal Mine is 22.98 m.Compared with traditional empirical formulas,the accuracy rate of 3DEC simulation results is higher,reaching 91.92%.The multi-directional analysis method of 3DEC simulation has guiding significance for predicting the development height of water conducting fracture zones under mining disturbance in Binhu Coal Mine and Tengxian Coalfield.
Tengxian Coalfieldwater conducted fracture zone3DEC numerical simulationfailure law of overlying rock"double end sealing side leakage"water injection test
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