Destruction Mechanism and Prevention Technique of the Tunnel of Gushing-Water Roof in Xinyi Coal Mine

In view of the deformation and failure of the tunnel of gushing-water roof in Xinyu Coal Mine, this paper analyzes the characteristics and mechanism of tunnel deformation and failure by the combing laboratory experiments, theoretical analysis, and on-site industrial tests. The results show that: 1) the deformation of the gushing-water roof is significant with the maximum deformation value of 700 mm, and the bolt cable and the I-beam bracket are seriously damaged; 2) the failure of 1505 mudstone tunnel roof is considered to be the result of its low strength and easy argillization when it is exposed to water, lack of waterproof measures, unreasonable support methods, etc.; 3) this paper proposes measures such as full anchor cable support, waterproof anchoring agent, and drainage holes, and clarifies their control mechanisms. The field practice shows that the deformation of the ventilation tunnel tends to be stable after about 30 days of the implementation of the plan, thus providing reference for the surrounding rock control in similar tunnels. (paper)