Study On The Deformation And Failure Mechanism Of Soft Rock Roadway And Control Technique Of Wufeng Coal Mine

Mine pressure control of the soft rock roadway surrounding has been one of the difficulties that harassed the production and construction of coal mine. Especially in the soft rock roadway under high stressed and swelling conditions, The effective control of surrounding rock is more difficult. The study on the deformation and failure mechanism of soft rock roadway surrounding under high stressed and swelling conditions, which not only can stimulate the development of mine pressure control of the soft rock roadway surrounding, but also has important theoretical significance and application value for the construction of soft rock project underground.The paper studied on the deformation and failure mechanism and control technique of soft rock roadway surrounding under high stressed and swelling conditions by the method that field measurement, laboratory test, numerical simulation and theoretical research are comprehensively applied.Based on the laboratory test, studied on the microstructure, mineral composition and water richard properties of the roadway surrounding, analysed on the physico-mechanical properties of the roadway surrounding, and clarified the interior factor that lead to the deformation and failure of the roadway surrounding. Based on the theoretical research, analysed on the law of the abutment distribution in the roadway surrounding, and clarified the external factor that lead to the deformation and failure of the roadway surrounding; analysed on the influencing factors and classification of the roadway floor heave, and cleared the floor heave mechanism of soft rock roadway;. Specific to the deformation and failure mechanism of soft rock under high stressed and swelling conditions, put forward the integral anchor and coupling support technology to control the roadway surrounding, and established the structural model, proofed the feasibility of the support measures by mechanics analysis.Based on the numerical simulation, studied on the deformation and failure characteristics of soft rock roadway surrounding, and clarified the main deformation and failure waya are tension and shear; Because of the existence the goaf, there is asymmetric phenomenon in stress distribution of roadway surrounding, and the development of the plastic zone appears asymmetric phenomenon, and put forward to asymmetric support measures; According to the law of plastic zone, put forward to the measure that reinforce the walls and corner to control floor heave. Through the numerical simulation of the integral anchor and coupling support technology, proved the effectiveness of the technology in soft rock roadway.Based on field measurement, obtained the ground pressure of soft rock roadway, at the same time, proved that the integral anchor and coupling support technology can prevent soft rock roadway from floor heave and wall heave, realized the effective control of soft rock roadway under high stressed and swelling conditions.