摘要
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 ascertain the reason of gas enrichment in the goaf of T2291 working face and the flowing channels of gas, the features of mining caused fractures of overlaying strata of T2291 in Tangshan coal mine is studied in this paper by using FLAC^3D and UDEC software. The common nature of stratum movement and the development procedure of crack are described; distribution characteristics of O-type circle fracture in the top floor mining along the strike are verified. The results showed by numerical simulation that the connecting fracture under the adjacent goaf is affected by the isolated coal pillar width and under the condition of hard roof the crack along the strike emerges saddle-backed state. The fundamental reason of longlasting drainage is that more goaf in lateral and longitudinal direction is connected by the crack in T2291 drilling.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2015年第5期584-589,共6页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(51374089)
唐山市科技计划基金资助项目(13130204z)
河北省高校科学研究基金资助项目(Z2003144)
关键词
采空区
裂隙分布
卸压抽采
瓦斯来源
特征分布
goaf
crack distribution
pressure releasing and gas drainage
gas sources
feature distribution
