综放复合顶板错层位外错式沿空掘巷异型窄煤柱宽度优化研究  

Optimized width of special-shape narrow coal pillar in external-staggered roadway with composite roof in gob-side entry driving

作　　者：刘会景[1] 林陆 李敬凯 李廷照 LIU Hui-jing;LIN Lu;LI Jing-kai;LI Ting-zhao(Urumqi Vocational University,Urumqi 830001,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]乌鲁木齐职业大学,新疆乌鲁木齐830001 [2]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《煤炭工程》2022年第6期12-17,共6页Coal Engineering

摘　　要：针对复合顶板沿空掘巷窄煤柱留设宽度以及围岩稳定性难题,以试验矿井具体地质条件为工程背景,采用现场调研、理论分析、数值模拟等方法,对综放沿空掘巷窄煤柱稳定性问题展开研究。分析了不同窄煤柱留设尺寸条件下传统综放工作面沿空掘巷“T”型煤柱围岩应力和塑性区分布特征,研究表明,传统综放工作面留设“T”型窄煤柱沿空掘巷两帮围岩塑性区呈非对称分布,顶板复合岩层破坏深度广,且窄煤柱帮处于不均衡承载状态,宽高比小,自身稳定性差,承载能力差。基于上述问题提出错层位外错式沿空掘巷技术,针对不同尺寸下异型煤柱进行数值模拟研究,结果表明,与常规“T”型窄煤柱相比,其具有优越的“堵漏风、阻变形、能承载”的护巷效果,为巷道围岩控制技术提供有利条件。In order to optimize the narrow coal pillar width and maintain the surrounding rock stability in gob-side entry driving under composite roof, taking the specific geological conditions of a mine as the engineering background, the stability of narrow coal pillar in gob-side entry driving with fully mechanized top-coal caving was studied by field investigation, theoretical analysis and numerical simulation. By studying and analyzing the distribution characteristics of the stress and plastic zone of the surrounding rock of the “T” type coal pillar in the gob-side entry driving of the traditional fully mechanized caving face under the conditions of different narrow coal pillar sizes, the study shows that the plastic zone of the surrounding rock of the two sides of the gob-side entry driving of the “T” type narrow coal pillar in the traditional fully mechanized caving face asymmetric, the failure depth of the roof composite rock is wide, and the narrow coal pillar is in an unbalanced bearing state, the width-height ratio is small, its stability and bearing capacity is poor. Based on the above problems, the stagger arrangement external-staggered gob-side entry driving is proposed, and the numerical simulation research is carried out on the special-shaped coal pillars with different sizes. The results show that compared with the conventional “T” type narrow coal pillar, it has superior roadway protection effect with better performance in air stopping, deformation controlling and load bearing, which provides favorable conditions for the roadway surrounding rock control.

关 键 词：复合顶板 错层位 外错式 沿空掘巷 窄煤柱 

分 类 号：TD822.3[矿业工程—煤矿开采]