关键词: 极近距离煤层, 分区支护, 数值模拟, 支护方案, 耦合支护

Abstract: In view of the uneven spacing between the underlying mining roadway and the overlying goaf in the extremely close coal seam, it is easy to have sparse or excessive support when adopting a support scheme. Based on theoretical analysis, numerical simulation, field test and other research methods, combined with the measured geological conditions, the air roadway in the experimental section is divided into three areas according to the layer spacing: greater than 6.0m, 4.0m ~ 6.0m, and less than 4.0m. According to the superimposed beam theory, the minimum effective anchor layer thickness of the roof of the mining roadway is obtained to be 3.51M, and the feasibility of bolt support in the underlying coal roadway is analyzed; Three support schemes are proposed for different layer spacing in three areas, and are tested by numerical simulation and applied in field engineering. The results show that after adopting targeted support in different areas, the surrounding rock is relatively stable, the surrounding rock deformation of the roadway is reasonably controlled, and the overall deformation of the roadway is small. The subregional support technology effectively controls the surrounding rock deformation of the underlying roadway, ensures the safe production of the mine, and reduces the cost of the enterprise.