关键词: 大倾角, “三软”煤层, 高强高预应力, 数值模拟, 现场监测

Abstract: Based on the analysis of the roof and floor of 202 transport gateway，the lithological characteristics of the coal seam and the stress environment characteristics of the gateway in a coal mine，combined with the support status of the mine，theoretical analysis and numerical simulation are used to improve the support of the stope roadway. Theoretical analysis shows that the vertical stress of roadway roof rock layer acts on the roadway floor through the stress transmission between rock layers，causing the floor to appear continuous floor heave，and at the same time，the separation phenomenon is easy to occur at the interface of roof rock layers. The numerical simulation results show that the range of the tensile stress zone after the excavation of the roadway is 1.8 m，and the overall deformation of the roadway is easy to occur if the selection of the support range is unreasonable. In view of the above situation，the design idea of high strength and high prestress support is proposed，and the anchor bolt length is determined to be 2.6 m. At the same time， the support improvement of anchor mesh cable+W-shaped steel strip+shotcrete is carried out for the transportation chute of the working face. The field test and monitoring results show that the coal seam working face is more stable in the high stress environment when the roadway is supported by this scheme，which can ensure the safe mining of the working face.

Key words: large inclination, "three soft" coal seam, high strength and high prestress, numerical simu? lation, scene monitor