Simulation analysis of mining disturbances and the countermeasures for surrounding rock control of roadway group in over-the-roadway extraction
Aiming at the difficulty in the surrounding rock control of roadway floor under the disturbance of working face mining,we took the floor roadway group of 1315 over-the-roadway extraction face bottom plate roadway of Anju Coal Mine as the research background,analyzed the distribution characteristics of stress and plastic zone in the surrounding rock of the roadway during the mining process of the overlying working face,by means of numerical simulation and on-site practice.The research results showed that when the working face advanced to 100 m from the terminal line,the influence range of the advance abutment pressure was about 35.8 m in the horizontal direction and 37.8 m in the vertical direction.The floor roadway was affected successively by the mining according to the distance to the working face.Aiming at the deformation characteristics of 3upper coal seam floor roadway group surrounding rock subject to disturbances,we proposed"anchor mesh cable+T-type steel belt+metal mesh"joint support scheme,and the on-site monitoring showed that the support program effectively controlled the surrounding deformation,to ensure the stable use of the roadway group under the working face during mining.
over-the-roadway extractionroadway groupnumerical simulationsupport parameterssurrounding rock control
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