摘要
针对近距离煤层群采空区下综采工作面矿压显现规律的差异性,为预防大倾角工作面发生片帮、冒顶、压架等事故,需对多煤层开采支承压力分布、支架受力特征及控制进行深入的研究。以潘北矿5煤和4煤近距离大倾角煤层开采为背景,对工作面前方煤体塑性区范围进行较深入的理论分析,得到煤壁支承压力分布特征;并采用FLAC3D对12124工作面回采过程中围岩力学特征进行数值模拟,获得采空区下12124工作面前后方应力分布特征、应力峰值大小及位置;通过现场实测得到支架工作阻力分布特征、支架最大工作阻力及位置。研究结果揭示近距离采空区下大倾角厚煤层综采支承压力演化叠加机制,提出工作面矿压控制对策,取得良好的应用效果。
How to complement effectively ground control has been an important and difficult issue in multiple fully-mechanized longwall mining for closed distance coal seams. Patterns of abutment pressure distribution,characteristics of hydraulic support force and condition under mined gob with longwall retreat mining should be synthetically investigated in order to prevent roof accidents such as rib spalling,roof fall and hydraulic support damage. Taking the No.5 coal seam and No.4 coal seam of Panbei mine as the background,the characteristics abutment pressure and the plastic zone in front of coal wall were deduced from theoretical formula. The mining-induced stress development,peak value and its location were obtained in front and background of No.12124 longwall panel under mined gob using FLAC3 D to simulate surrounding rock mechanical characteristics. The characteristics of working resistance,maximum resistance and distribution of hydraulic support had been observed and obtained. Researches results show that abutment pressure evolution superposition mechanism has been revealed under closed distance and mine gob in thick coal seam and large dip angle with fully mechanized longwall mining. Based on comprehensively analyzing,ground control countermeasures have been put forward to increase working resistance,to push roof metal-mesh,and to enhance face guard with individual prop. And effective applications were obtained.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期4278-4285,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51374011)
关键词
采矿工程
近距离煤层群
采动应力叠加
大倾角
厚煤层
矿压显现
mining engineering
closed distance coal seams
mining-introduced stress superposition
large inclination angle
thick coal seam
strata behaviors
