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为探明唐山矿T2291工作面采空区瓦斯富集的原因及瓦斯运移通道的来源,采用FLAC3D与UDEC离散元两种模拟方法,对比分析T2291采空区煤柱破裂及顶板离层发育过程和采动裂隙的叠加影响规律,查明了上覆岩层裂隙形成的过程,验证了走向采动下顶板“O”型圈裂隙分布特征.研究结果表明:邻近采空区下位裂隙贯通受隔离煤柱宽度影响较大,中硬顶板条件下裂隙在走向充分采动与倾向非充分采动下呈现“鞍形”分布特征,得出唐山矿T2291钻孔实现横向和纵向多采空区联合抽放的根本原因.
In order to find out the causes of gas enrichment and the source of gas migration channel in the goaf of T2291 working face in Tangshan Mine, FLAC3D and UDEC discrete element simulation methods were used to compare and analyze the coal pillar rupture and roof delamination development in T2291 goaf And the overlying effect of mining fissure, the process of fissure formation in overlying strata was identified, and the distribution of fissures in the top plate “O ” ring was verified. The results show that the lower fissure passing through the adjacent gob The width of the pillars is greatly affected. In the case of medium-hard roof, the fractures show “saddle-shaped” distribution under full mining and full-dip mining conditions. It is concluded that the T2291 drilling in Tangshan Mine can realize horizontal and vertical mined-out The root causes of joint drainage.