Research On Deformation Failure Mechanism And Bolt-Grouting Reinforcement In High-Stress Deep Soft Rock Roadway

With the increasing of mining depth, geo-stress of the roadway and mining stope is also increasing, ground pressure of soft rock roadway turns intense, and the surrounding rock deforms severely. Reinforcement of deep high-stress soft rock roadway is becoming more and more prominent; therefore it's significant to study the deformation characteristics, the failure mechanism and the stability control technique of deep high-stress soft rock roadway. Based on the complex soft roadway, chamber deformation characteristics and failure mechanism of Tangkou Mine, affiliated to Zibo Coal Mining Co., and from the status quo of deep high-stress soft rock roadway at home and abroad and supporting questions of deep high-stress soft rock roadway, a research program of combing geological mechanics test, theoretical analysis, numerical simulations, mining pressure monitoring and engineering practice is verified. In this dissertation, the main investigation work focuses on the following several aspects.(1) Based on the geological characteristics of deep high-stress soft rock roadway and the visco-elastic analysis of the model of Burgers on deep high-stress soft rock roadway, the expressions of surface displacement and displacement rate of surrounding rock in deep high-stress soft rock roadway are obtained, both the relationship of surrounding rock roadway surface displacement and its rate with time was curved respectively under different original rock stress, elastic modulus, and viscosity index with the help of Matlab. FLAC 3D is used to simulate the rheological characteristics, analyzing the deformation features of the roof, floor and two-sides of the surrounding rock under high-stress.(2) Failure mechanism of deep high-stress soft rock roadway under the condition of high geo-stress is analyzed using elastic-plastic mechanics and rheological mechanism. failure mechanism under the condition of high pore water pressure and high temperature is carried out employing the mechanics of porous media flow and basic thermo-dynamics theory. FLAC 3D is used to simulate the deformation characteristics of deep high-stress soft rock roadway, analyzing the influence of different angles of the roadway axial and maximum horizontal stress on the stability of surrounding rock. (3) FLAC 3D is used to reveal the mechanic characteristics of deep high-stress soft rock roadway in excavation. According to the deformation damage characteristics, failure mechanism and mechanical analysis of deep high-stress soft rock roadway, the roadway control theory is optimized. FLAC 3D is used to simulate the mechanism of bolt-grouting reinforcement and the developing discipline of the elastic-plastic region is studied using the elastic-plastic theory. The maximum load-bearing capacity using the reinforcement of bolt-grouting is finished.(4) Based on the existing reinforcement problems of Tangkou Mine, a combination supporting system with the inter-grouting anchor as the leading actress is expounded. In-situ monitoring show that combination supporting system controls the large deformation and the rheological properties of deep high-stress soft rock roadway effectively, maintaining the roadway's long-term stability and achieving a high economic effect.