南梁煤矿间隔式采空区下煤层开采动压机理研究

发布时间：2018-11-10 13:44

【摘要】：浅埋煤层由于其煤层赋存具有埋深浅、基岩薄、表土覆盖层较厚等特点,其采场矿压显现常呈现出不同于其它煤层的特征,来压时工作面矿压显现强烈,因此对于浅埋煤层,采场矿山压力控制是目前的一个难题。而浅埋近距离煤层重复采动覆岩关键层结构类型及其破断运动特征是引起下煤层工作面矿压显现剧烈程度的一项重要因素,是掌握下煤层工作面发生动载矿压机理的前提,对于浅埋近距离煤层上煤层已采下层单一关键层而言,当上煤层采后其上关键层破断后的结构处于失稳状态,下煤层开采时下关键层结构破断后的结构易出现滑落失稳,工作面矿压显现异常强烈,工作面易出现台阶下沉和压架事故。南梁煤矿位于神府矿区新民开采区内,其中2-2、3-1两层煤层为井田的主要可开采煤层,两煤层的平均间距为20m,上煤层2-2煤层采用长壁式开采和房柱式开采的间隔式开采方法,下煤层3-1煤层采用长壁式开采方法。论文针对神东矿区浅埋近距离煤层重复采动易出现动载矿压之特点,以南梁煤矿地形为工程背景,采用现场调研、相似材料模拟实验、理论分析和数值模拟等手段,开展了浅埋近距离煤层间隔式开采后重复采动覆岩结构失稳机理的研究,确定南梁煤矿间隔式开采后对下煤层矿压的影响因素,提出南梁煤矿近距离煤层间隔式重复采动上覆岩层结构失稳控制与防范措施,避免因动载矿压影响矿井的正常生产。
[Abstract]:Because the coal bed of shallow coal seam has the characteristics of shallow buried depth, thin bedrock, thick overburden layer and so on, its stope rock pressure behavior is often different from other coal seams, and the mining face pressure appears strongly when it comes to pressure, so for shallow buried coal seam, Pressure control in stope mines is a difficult problem at present. However, the structural types of the key strata and the breaking movement characteristics of the overburden strata in the shallow and short distance coal seams are an important factor that causes the intense occurrence of the rock pressure in the working face of the lower coal seam, and is also the premise of mastering the mechanism of the dynamic rock pressure in the working face of the lower coal seam. For the single key layer of the upper coal seam of shallow buried short distance coal seam, the structure of the upper key layer after mining is in the state of instability, and the structure of the key layer after the breaking of the key layer is prone to slip and lose stability during the mining of the lower coal seam. The coal pressure of the working face is very strong, and it is easy to appear step sinking and pressure frame accident. Nanliang coal mine is located in Xinmin mining area of Shenfu mining area, in which 2-2Q3-1 coal seam is the main mineable coal seam in the mine field, and the average distance between the two coal seams is 20m. Long wall mining and roof pillar mining are used in 2-2 coal seam of upper coal seam, and long wall type mining method is adopted in 3-1 coal seam of lower coal seam. Aiming at the characteristics of repeated mining of shallow and close distance coal seam in Shendong mining area, dynamic load rock pressure is easy to occur. The topography of south Liang coal mine is the engineering background. The methods of field investigation, similar material simulation experiment, theoretical analysis and numerical simulation are adopted in this paper. The instability mechanism of overburden structure after interval mining in shallow and short distance coal seam is studied, and the influence factors of interval mining in Nanliang coal mine on the rock pressure in lower coal seam are determined. This paper puts forward the measures of controlling and preventing the structural instability of overburden strata in short distance coal seam interval mining in Nanliang Coal Mine, so as to avoid the influence of dynamic rock pressure on the normal production of mines.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.8;TD32

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