承压水上采煤底板破坏特征  

Floor Failure Characteristics of Coal Mining Above Confined Aquifers

作　　者：李可[1] 

机构地区：[1]贵州理工学院矿业工程学院,贵州贵阳550003

出　　处：《煤矿安全》2017年第2期178-180,184,共4页Safety in Coal Mines

摘　　要：根据弹性力学空间半无限体理论建立了沿煤层走向底板受力力学模型,计算了工作面推进过程中底板内任一点处的水平应力大小。以菏泽龙固煤矿1302工作面的采场条件为工程背景,基于FLAC^(3D)数值仿真软件对该工作面推进过程中底板破坏特征进行数值模拟。研究表明:煤层回采后,采动底板最大破坏深度为15 m左右。采空区底板水平应力呈"凹"型分布,随着工作面的推进,采空区两端煤壁附近底板水平应力集中效应显现。采用钻孔双端封堵测漏装置对1302工作面底板破坏深度进行现场实测。实测表明:1302工作面底板最大破坏深度为14 m,与数值模拟所得结果基本吻合。Based on semi-infinite body theory of elastic mechanics space, the mechanical model of floor force along the coal seam was established, the horizontal stress at any point of coal floor was calculated during the advancing process of working face. Based on stope conditions of Heze Longgu Mine 1302 working face, FLAC^3D numerical simulation software is used to conduct numerical simulation of floor failure features during the advancing process of working face. The research shows that the maximum damage depth of mining floor is about 15 m after coal seam mining. Horizontal stress of gob floor is ＂concave type＂ distribution; with advancing of working face, the horizontal stress near coal wall at both ends of goaf appears concentration effect. Adopting drilling double-ended sealing leak detection devices to do field test for floor failure depth of 1302 face, the actual measurement shows that the maximum damage depth of 1302 face floor is 14 m, which is basically consistent with numerical simulation result.

关 键 词：FLAC^3D 采动底板 数值模拟 底板破坏 现场实测 

分 类 号：TD741[矿业工程—矿井通风与安全]