Reasonable Width of Coal Pillar in Gob-side Trapezoidal Roadway in Inclined Thick Coal Seam

To explore the reasonable pillar width of roadway along goaf in inclined coal seam, theoretical analysis, numerical simulation and industrial test are combined to carry out the research. The results show that the influence range of stress field in inclined coal seam is 12.2 m to 12.8 m by establishing the basic roof mechanics model of roadway along goaf; the distribution characteristics of deviating stress in surrounding rock of roadway under different widths of coal pillar are numerically simulated, and the reasonable narrow coal pillar width is determined to be 10 m; then the asymmetric surrounding rock control under the coupling action of roof pre-stressed bolt + high strength single bolt cable + truss bolt cable support is proposed. The results of field observation show that the surrounding rock of roadway is stable.