Study on control technology of surrounding rock of strong dynamic pressure coal roadway during deep thick coal seam mining
Mining of strong dynamic pressure coal roadways in deep thick coal seams faces geological challenges such as complex envi-ronments with deep high stress,high development and expansion of surrounding rock fractures,and a large range of mining disturbances.Therefore,in order to explore a reasonable plan for controlling the surrounding rock of the strong dynamic pressure coal roadway in deep thick coal seam mining,taking the return airway of the No.1605 mining face of Guhanshan Coal Mine as the engineering background,a combination of numerical simulation,theoretical analysis,and on-site practice was used to conduct research on the failure mechanism and control technology of the surrounding rock of the strong dynamic pressure coal roadway in deep thick coal seam mining.By introdu-cing the second invariant of deviating stress(J2)research index to overcome the defect of traditional single stress index,the second in-variant of deviating stress in surrounding rock of roadway and the distribution characteristics of plastic zone in surrounding rock of road-way at different positions of advanced working face were studied,and the deformation and failure mechanism of surrounding rock of road-way in the front section of the working face were revealed.The comprehensive control technology of surrounding rock of"full cable of roadway sides+roof bolt(cable)combined support+roof side reinforcement mesh laying"was proposed accordingly.The on-site engi-neering practice show that the maximum displacement of the two sides and the roof and floor of the roadway is within a controllable range,achieving effective control of the surrounding rock of the strong dynamic pressure coal roadway in deep thick coal seam mining.
deep wellthick coal seamstrong dynamic pressurefailure mechanismjoint control
万方数据
维普
