CAJ | 학술논문

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.
장악연공굴항착매주채공구측이유지호결구대매주은정성적영향.채용 FLAC3D 유한차분수치모의방법,연구불동지호강도조건하착매주적변형화파배규률.연구결과표명:상구단공작면회채화연공굴항대매주은정성적영향교대,착매주채공구측적매체선우항도측진입소성구,변형량원대우항도측;채공구측적지호결구대한제매체소성구확전적작용불명현,지호강도대매주은정성적영향교소;채공구측적지호결구흔용역실효혹강도발생엄중쇠감,항도측적지호결구수채동영향소,호강도대착매주은정성적영향정도대우채공구측.
@@@@To find out the influence of pre-existing gob-side supporting structure in narrow coal pillar of gob-side entry driving on the stability of coal pillar, the FLAC3D finite difference numerical simulation method is adopted in this paper to study the deformation and failure regularity of narrow coal pillar under different supporting intensity. The result indicates that both coal mining in last working face and gob-side entry driving have great impact on the stability of coal pillar, moreover, the coal of narrow coal pillar on the gob side is prone to turn plastic than that on the entry side. The deformation amount is much larger than that on the entry side as well. The supporting structure on the gob side is not so effective in constraining the expansion of plastic zone; its supporting intensity exerts little influence on the stability of coal pillar. The supporting structure on the gob side is apt to fail or weaken seriously in its intensity, whereas, the supporting structure on the entry side is hardly affected by mining, meanwhile, its supporting intensity exerted on the stability of narrow coal pillar is larger than that on the gob side.