SUPPORT DESIGN OF THE STOPING ROADWAY IN THE RE-MINED COAL SEAM UNDER INFLUENCE OF DUAL MINING

This paper aims to solve the support problem of the mining roadway in the re-mined coal seam under the influence of double mining in Xuehugou Coal Mine. After field observation,the upper part of the roadway roof has the coexistence of the upper empty roadway and the coal body,which increases the difficulty of support. Through theoretical analysis and numerical simulation,the surrounding rock stability of 2-106A2 roadway is analyzed under the influence of dual mining. The original support plan is verified. The results show that the original support scheme cannot meet the stability of the roadway under this condition. The roof and the right side of the roadway are needed to be reinforced. We use numerical simulation method to analyze the stability of surrounding rock after adopting reinforcement support plan for 2-106A2 roadway. The simulation results show that the designed reinforcement plan is reasonable. In addition,the cross-point method is used to observe the deformation of surrounding rock in the 230 m section of the 2-106A2 roadway affected by the dual mining. The maximum sinking amount of the roof of the roadway is 195 mm,and the moving distances of the left and right sides are 124 mm and 265 mm respectively. The deformation of the broken zone of the roof of the roadway is well controlled,realizing safe and efficient mining of the working face.