Study On Equipment And Technology Of Mechanized Roadway Filling And Retention In Solid Filling Mining

Solid backfill mining technology has achieved good application effects such as rock formation stability control,ecological environment protection and safety risk reduction.The solid backfill mining technology and the retaining technology are combined to study the filling retaining technology along the solid backfill working face,which can realize the coal pillar free mining,maximize the recovery of resources and control the uniform surface movement and deformation.However,the promotion and development of solid backfill along the filled roadway are still restricted by the uncertain relationship between the stability of the roadway support body and surrounding rock,the unclear law of grout diffusion in the gangue medium material,and the high cost of cement used for grouting.In order to further study the stability of roadway along the filling roadway,the influencing factors of mechanical properties of gangue based concrete filling materials composed of gangue,ore powder,clinker and gypsum and the grouting diffusion model of cementing materials in gangue medium were studied through laboratory tests and numerical simulation.Meanwhile,in order to improve the working efficiency of solid backfill mining face along backfill roadway,reduce labor intensity and improve the effect of solid backfill mining along backfill roadway,a mechanized method is proposed to keep the roadway along the back of the filling body edge with the special equipment along the filling roadway.On the premise of ensuring the stability of the roadway along the retaining lane,the cost of retaining lane is reduced and the labor intensity of workers is reduced.(1)Study the filling process for upper strata deformation mechanism,clarify the charge for overburden moving law,for filling open along the filling line for each period by supporting body stress analysis,build the supporting strength model line,illustrates the roof pressure and filling body weight during the double side pressure,the supporting body on balance,The relationship between its stability and supporting material.(2)Laboratory tests were conducted to obtain the particle size grading with the best compactness of coal gangue.Based on the diffusion theory of granular grouting,the diffusion model of cementitious material grout in gangue granular medium material is constructed.ANSYS FLUENT was used to numerically simulate the grouting diffusion process of grout in gangue medium materials under different parameters,and the influence law of grouting spacing on the grouting effect in gangue medium materials.Through the orthogonal test method,the influence law of different solid-cement ratio,water-cement ratio,gangue porosity and curing age on the mechanical properties of gangue based concrete materials was explored.Triaxial tests were carried out to measure the cohesion and internal friction Angle of gangue based concrete materials.(3)The technological methods of retaining the roof of the mechanical gangue retaining frame mould and modular cyclic moving forward are studied,and the mechanized retaining equipment along the filling lane is developed,including the highlow adjustable hydraulic template for retaining gangue,the rail type moving forward platform with the frame,and the articulated hydraulic manipulator device.ADAMS software was used to construct a manipulator simulation prototype and simulate its grasp motion trajectory.The rationality of its structure was verified by simulation results.ANSYS was used to verify the compressive resistance of the gangue template structure.