| In order to solve the deformation control of surround rock and roadway support of Tongmei Group Tiefeng company Nanyangpo mine coal. through field survey and data collection, Aimed at the status of the original supporting of coal drift in 8, put forward the optimization design of support and surrounding rock deformation control scheme. By comparing the deformation control of surrounding rock of roadway cross section of the form and the best effect, eventually detemine the Nanyangpo coal seam roadway 8 adopts the circular roadway cross section form and corresponding supporting method. Through establishing reasonable model and simulated respectively using MADIS-GTS software under the condition of different sections and supporting about the plastic area of the internal and surrounding rock of roadway deformation condition. Results show that the circular roadway cross section can not only reduce the use of supporting materials and can better guarantee the production safety and the impact on the surrounding rock deformation of roadway better control.The 8 coal seam in Nanyangpo the average coal thickness is 6.64 meters, it is a thick coal seam, in view of the thick coal seam coal roadway with the method of field sampling of coal ang rock sample to lab testing sample its basic physical and mechanical parameters, and then optimize the roadway support design. On the spot for optimization design of roadway support with construction after use,8 coal seam 408 panel return air lane roadway surrounding rock bolt stress monitoring and deformation monitoring, monitoring results show that after the optimization design of support and surrounding rock deformation and roof two soft coal easy caving conditions to obtain the very good control, the overall stability of roadway strengthened. With the monitoring data and numerical simulation analysis contrast to the following conclusion:the plastic zone of roadway is mainly focused on the roof, after excavation of roadway roof by disturbance to the greatest extent. Circular roadway to 1.4% of the total of the plastic zone, plastic zone of rectangular tunnels in the proportion is 3%, show that the retangular tunnel form of section control unfavorable to the scope of the plastic zone, is mainly due to the retangular roadway roof under large bending moment loose surrounding rock deformation of roadway roof is larger scope. Rectangular tunnels of cell strain in Sxx?Syy?and Szz directions were greater than circular roadway, and the rectangular strain distubrance of surrounding rock of roadway unit area significantly greater than the disturbance of surrounding rock of roadway unit area of circular, further illustrate the rectangular roadway cross section form against the deformation of surrounding rock control. Rectangular roadway use the anchor diamond metal ne?anchor longitudinal W steel belt supporting method compared with the circular roadway bolt?diamond wire mes?steel ladder support mode for the deformation of surrounding rock of roadway stability control and control, there is no substantial advantage instead to the effect of the surrounding rock deformation control than circular roadway cross section form, therefore, reasonable selection of the stress of the roadway surrounding rock of roadway cross section shape to make uniform as possible can reduce the damage of surrounding rock. At the same time the coal seam through the fault fracture zone, according to the characterstic of easy dformation in coal roadway adopting forepole control method to control the deformation of surrounding rock.This thesis research results not only in Nanyangpo coal roadway supporting research has practical value, but also to the national coal mine roadway support design has a certain reference value. |
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