关键词: 极近距离煤层, 下分层, 巷道布置, 支护技术, 围岩应力

Abstract: Tai'an Coal Mining 11# coal seam and 12# coal seam, the distance between two layers of coal seams in some sections is about 3m, study 12# coal seam working face roadway distance extended into 11# coal seam coal pillar and roadway support technology is necessary. Carried out geomechanical testing, numerical simulation of the stress distribution of surrounding rock of 12# coal seam after mining of 11# coal seam face, the roadway support technology was put forward in a targeted manner, and the field test was carried out. The results show: the average strength of 12# coal seam roof siltstone is 66.00MPa, the average strength of 12# coal seam is 14.34MPa, the axial direction of the roadway differs from the optimal arrangement by 10.9°, roadway deformation is affected by the direction of the maximum horizontal principal stress; after 11# coal seam working face mining, the area with high stress concentration in 12# coal surrounding rock is about 2m; roadway support technology adopting “timely support, high pre-tightening force and strong protection table”, supporting W steel guard plate with high strength rockbolt with diameter of 22mm; the results of mine pressure monitoring show that the roof subsidence is less than 35mm, The distance between the two groups is less than 80mm considering that the roadway has to withstand two mining effects, the support scheme is reasonable and reliable.