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掌握沿空掘巷窄煤柱采空区侧已有支护结构对煤柱稳定性的影响.采用FLAC3D有限差分数值模拟方法,研究不同支护强度条件下窄煤柱的变形和破坏规律.研究结果表明:上区段工作面回采和沿空掘巷对煤柱稳定性的影响较大,窄煤柱采空区侧的煤体先于巷道侧进入塑性区,变形量远大于巷道侧;采空区侧的支护结构对限制煤体塑性区扩展的作用不明显,支护强度对煤柱稳定性的影响较小;采空区侧的支护结构很容易失效或强度发生严重衰减,巷道侧的支护结构受采动影响小,护强度对窄煤柱稳定性的影响程度大于采空区侧.
To grasp the effect of existing supporting structure on the stability of coal pillar at the side of gob-side entry of narrow coal pillar.Because of the finite difference numerical simulation method of FLAC3D, the law of deformation and failure of narrow coal pillar under different support strength is studied. The results show that the upper section of face working face excavation and gob-side entry driving influence the stability of coal pillar greatly. The coal body on the side of gob of narrow coal pillar goes into the plastic zone ahead of the roadway side, the deformation amount is much larger than the side of the roadway; The supporting structure on the side of the empty area has no obvious effect on limiting the expansion of the plastic zone of coal body, and the supporting strength has little influence on the stability of the coal column. The supporting structure on the side of the gob is very easy to fail or the intensity is seriously attenuated. The supporting structure on the side is less influenced by mining, and the influence degree of retaining strength on the stability of narrow coal pillar is greater than the side of the gob area.