Research on Support Technology for Crossing Soft Rock Strata in Layered Tunnels
During the transportation and excavation of 5600 up the mountain,it crosses through soft rock layers with geological structures such as faults,which brings new challenges to the support of tunnel surrounding rock.Based on the analysis of the lithology and deformation characteristics of the surrounding rock during the transportation of 5600 up the mountain,a rock support technology measure is proposed based on the concept of asymmetric support.Specifically,asymmetric anchor rod(cable)support,bottom corner anchor rod,and grouting support are used to control the deformation of the surrounding rock.The strength of weak support links is strengthened through asymmetric support,reducing the deformation of the roof and roadway walls.Cutting off the stress transmission path between the top plate,roadway support,and shallow bottom plate through bottom corner anchor rods to reduce the deformation of the roadway support.By injecting grout,the overall stability and strength of soft rock layers can be improved,and the coupling effect between the support system and surrounding rock can be enhanced.After on-site application,the deformation of the surrounding rock when transporting the 5600 up the mountain through soft rock layers is within the allowable range,which can meet the needs of transporting the 5600 up the mountain for excavation and subsequent use.
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