Mechanics and Deformation Analysis of TBM Excavation in Coal Mine Tunnels
Based on the CVISC creep model,the TBM excavation process of the No.8 coal mine south return airway in Bao'an mining area was analyzed.The displacement and mechanical performance changes of the roadway under different support methods were studied,and the numerical simulation results were compared with actual monitoring data to verify the accuracy of the numerical simulation results.The results show that using anchor cables and anchor rods to support coal mine tunnels can reduce the stress on the surrounding rock of the tunnel.Among them,the support method of anchor cables+steel mesh has the best effect.The vertical stress under each working condition is greater than its horizontal stress.The stress on coal mine tunnels is mainly vertical,and the maximum stress occurs at the top and bottom of the surrounding rock.The displacement of the surrounding rock under different support methods has certain differences.The displacement generated by the support method of anchor cable+steel mesh is the smallest.The stability of coal mine tunnels is higher,and the displacement of surrounding rock without support measures is the largest.At this time,the stability of coal mine tunnels is poor and deformation is prone to occur.
coal mine tunnelsfinite element simulationsurrounding rock displacementsupport method
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