Application of Advanced Grouting Reinforcement Technology in 5703 Transportation Roadway Excavation Passing Through Fractured Zones
In response to the problems faced by the 5703 transportation roadway during the excavation of the fault and fractured zone,such as poor formation effect of the roadway,severe deformation of the surrounding rock,and easy roof caving,combined with the on-site situation,it is proposed to use advanced grouting to create good conditions for roadway excavation and surrounding rock control.Specifically,two rows of grouting boreholes are arranged at the front end of the excavation face to achieve reinforcement of fractured coal and rock masses within a range of 3 meters of the outer contour line of the tunnel roof excavation.The grouting slurry is selected with fast bonding Yukarni organic chemical adhesive,and the time required for single cycle grouting reinforcement can be controlled within 1 hour,with minimal impact on excavation;The surrounding rock is supported by a combination of shed,anchor rod(cable),metal mesh,and shotcrete,with high support strength and good control effect on the surrounding rock.After on-site application,the surrounding rock of 5703 transportation roadway remained stable during the excavation of the fractured zone,achieving significant results.
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