关键词: 近距离煤层群, 房柱式采空区, 综合探测, 煤柱稳定性, 蹬空开采, 可行性分析

Abstract: Because of the lack of technical data of the size of remaining coal pillar, safety mining of shallow deep and adjacent coal seam is affected by the house-pillar mining method after mining the shallow seam. Based on the geological and mining conditions of 2-2 coal seam using house-pillar mining method in third panel, Hanjiawan Coal Mine, drilling investigation, 3D laser scanning, physical and mechanical property testing, water detection in goaf, theoretical analysis and other research work have been carried out. Using technology of "goaf drilling+leakage observation+goaf water detection+dimensional laser scanning", it is obtained that roof crack development degree of the goaf column type goaf is low, roof strata are relatively complete, the parameters of coal pillar and warehouse are 7m and 8m respectively, and the height of goaf water in some areas is 0.15~0.35m. Based on laboratory test results, stability of residual coal pillar under the current condition of 2-2 coal and the stability of disturbed 2-2 coal pillar under the push off of 1-2 coal longwall working face are calculated and analyzed by relevant theories. Results show that residual coal pillars of different room and pillar mining sizes of coal 2-2 are temporarily stable under the current situation. The abutment pressure of 1-2 coal longwall face pushing off 2-2 coal room pillar goaf affects 2-2 coal residual pillar can not keep stable; The mining scheme of "mining group coal seam first, using mine pressure to destroy the residual coal pillars of coal 2-2, and then implementing the house-pillar type goaf after the upper group coal push off disturbance destruction" is technically feasible.

Key words: adjacent coal seams, house-pillar goaf, integrated detection, pillar stability, strip-off mining, feasibility analysis