Research on Reinforcement Technology for Severe Deformation Sections of Surrounding Rock in Development Tunnels
Based on the on-site conditions,surrounding rock deformation characteristics,and tunnel drilling observation results of the transportation roadway in mining area 2,it is analyzed that the main reasons for severe local surrounding rock deformation in the roadway are low surrounding rock strength and fragmentation,geological structure and mining pressure superimposed effects,and unreasonable original support methods.To this end,it is proposed to reinforce the surrounding rock of the tunnel through anchoring,U-shaped steel telescopic support,and anchor rod reinforcement.The specific measures are:①improving the bearing capacity and strength of the surrounding rock through grouting;②U-shaped steel telescopic supports and anchor rods can fully leverage the advantages of passive and active support,providing greater support force to the surrounding rock of the tunnel.Based on the on-site situation of the transportation roadway in mining area 2,a specific reinforcement technology plan for the roadway is proposed.After on-site application,the problem of severe deformation of the surrounding rock in the transportation roadway in mining area 2 has been effectively solved.The deformation of the roof and roadway sides has been monitored to be stable at 76 millimeters and 54 millimeters,respectively.The convergence of the roadway section is relatively small,which can meet the needs of subsequent use.
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