Research on Surrounding Rock Control Technology for Soft Rock Tunnels under Dynamic Pressure Influence
The surrounding rock of the 3506 return air roadway is soft rock,and the roadway is affected by the mining pressure of the original and adjacent mining faces.The deformation of the surrounding rock is large,and the local support system is facing failure,which has a significant impact on the subsequent use of the roadway.Based on the analysis of the on-site conditions and deformation characteristics of the surrounding rock in the return air roadway,it is proposed to use high-strength pre tensioning anchor rods(cables)+bottom angle anchor rods+roadway side anchor cables for support.Through high-strength pre tensioning anchor rods(cables),the support strength of the roof and roadway side surrounding rock is strengthened,and the coupling effect between the support system and the surrounding rock is improved.The use of bottom angle anchor rods can reduce or even block the influence of roof and roadway pressure on the bottom plate,and improve the bottom plate's ability to resist floor heave.The anchor rod of the roadway can transfer the stress of the roadway to the deeper part,reducing the surface displacement of the roadway.After on-site application,the deformation of the surrounding rock in the 3506 return air roadway under the influence of dynamic pressure remained within the allowable range,creating good conditions for the normal use of the roadway.
dynamic pressure influencesoft rock roadwaysurrounding rock supportbottom angle anchor rodpre-tensioning anchor rod(cable)
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