Research and Application of Surrounding Rock Control Technology for Fully Mechanized Mining Face Passing Through Fault Fracture Zone
In order to solve the problems of support failure,wall caving,local roof collapse and so on when the working face crosses the fault structure area,taking the 133upper03 fully mechanized mining face of Jining No.2 Coal Mine as the engineering background,numerical simulation is used to study the evolution law of the overlying rock layer during the process of the working face crossing the fault.The variation law is concluded that as the distance between the working face and the fault decreases,the shear stress gradually decreases first and then increases,and the normal stress gradually increases first and then decreases,and roof support should be strengthened in the area 10-30 m away from the fault;meanwhile,grouting can reduce the phenomenon of stress concentration and effectively control the deformation and failure of the surrounding rock passing through faults in the working face.Through the on-site industrial test,the feasibility of the scheme is verified by the control measures of the fully mechanized mining face passing through the fault fracture zone.
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