房柱式采空区下长壁工作面覆岩宏观变形特征研究

摘要

Based on the actual mining of the long＇wall coal mining face under the goaf of the room and pillar mining in Ordos Mining Area, a method combined with a theoretical analysis, site measurement and numerical simulation was applied to study the micro deformation fea- tures of the overburden strata above the coal mining face under the goaf of room and pillar mining. The results showed that the roof struc- ture above the longwall coal mining face under the goaf of room and pillar coal mining would have a feature with a large structure in the top roof and small structure in the bottom roof. The reciprocal effect between the large structure and small structure would cause the circulated terminal resistance of the powered support and the roof pressurization judging data higher than at the bottom of the coal seam and at the bottom of the longwall mining goaf. There would be a stress concentrated abnormal zone existed in the coal wall of the longwall coal mining face under the coal pillar left in the goaf. Thus the spalling from the coal mining face and the roof breaking danger would be increased and the powered supports would lost its stability.%基于鄂尔多斯矿区房柱式采空区下长壁工作面回采实际情况，采用理论分析、现场实测和数值模拟相结合的方法，对该条件下工作面覆岩宏观变形特征进行了研究。结果表明，房柱式采空区下长壁工作面顶板结构呈现上部大结构和下部小结构的特征，大结构和小结构交互影响，导致支架循环末阻力和来压判据较实体煤下和长壁采空区下都大，遗留煤柱下方工作面煤壁处存在应力集中异常区，工作面片帮和切顶危险增加，更易导致采场支架失稳。