Study On Bolting Support Of Three-soft Coal Seam Roadway In Sliding Structure Zone In Gaocheng Coal Mine

Three-soft coal seam roadway support is one of the coal roadway supporting technology problems. This paper takes three-soft coal seam 20161 roadway in sliding structure zone in Henan Gaocheng as the background, based on analysis of the characteristics of deformation and damage of the roadway, through the method of numerical simulation, physical simulation and limit equilibrium ring combination of theoretical analysis, analysis of deformation characteristics and put forward the reasonable supporting parameters of roadway earthly success, provided the theory basis for the bolting in three-soft seam roadway.Making clear Gaocheng three soft seam roadway physical and mechanical parameters by rock mechanics experiment; Finding that the roadway convergence deformation around, the max deformation reaches from 850 mm to 950 mm, dofoamation in convergence with the top and bottom, which is 1.27 times the amount of deformation of the two sides by field measure deformation characteristics and rules of roadway; Through numerical simulation and physical simulation test analysis soft seam roadway mechanism of deformation, obtained Gaocheng coal roadway destruction mainly embodied in the right ribs with roof and floor sinking,adopts the optimized roadway section(the bottom arch) can make the right on the upper part for stress transfer, roof and floor closer are reduced. Based on the condition of soft bottom,calculation models of limit equilibrium arch are established in three case of only considering the effect of roof, consider the effect of two sides and roof, consider for floor, two sides and roof of roadway joint effect, the analytical expression of the limit equilibrium arch are given,analyzes the mutual influence relations of roadway floor, two side, top, the calculation formula of supporting parameters is determined. To analysis roadway theory by consider soft bottom limit equilibrium ring formula derivation. Collected 14 similar roadway supporting parameters which through the engineering analogy method, and analysis of roadway equilibrium ring theory, determine the spray anchor net cable add four meter bolt in the middle of ribs add W steel band combined supporting method. Finally, verifying and evaluating the reliability of the program by physical and numerical simulation.