上覆煤层开采后下伏煤层卸压机理分析  被引量:16

Pressure-relief mechanism of lower seam extraction after upper seam extraction

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作  者:汪锋[1] 许家林[1] 谢建林[1] 郭杰凯[1] 

机构地区:[1]中国矿业大学煤炭资源与安全开采国家重点实验室矿业工程学院,江苏徐州221116

出  处:《采矿与安全工程学报》2016年第3期398-402,共5页Journal of Mining & Safety Engineering

基  金:国家"十二五"科技支撑计划项目(2012BAK04B06)

摘  要:以开滦唐山矿Y485工作面受上覆5#煤层采空影响为背景,基于关键层理论,采用数值模拟和现场实测研究了上覆煤层开采后下伏煤层的卸压机理。结果表明:覆岩中往往存在多层关键层,会对工作面支承压力产生影响。卸压开采后上覆关键层发生破断,下伏煤层工作面回采时仅在层间关键层的影响下支承压力的影响范围和峰值显著降低。唐山矿上覆5#煤层工作面回采后,仅在层间关键层的影响下,下伏9#煤层Y485工作面超前支承压力影响范围由73 m减小至38 m,超前支承压力峰值与工作面煤壁的距离由29 m减小至20.5 m。当两煤层间存在厚硬关键层时,开采上覆煤层对下伏煤层进行卸压时,下煤层工作面支承压力峰值的最大值是无关键层时的2.34倍,下煤层回采时仍产生了显著的应力集中。With the extraction influence coal seam 5# on longwall panel Y485 in Kailuan Tangshan coal mine as research background and based on the key strata theory, the pressure-relief mechanism of lower seam extraction after the upper seam extraction has been studied through numerical model and field ob-servation.The results have shown that during mining, the distribution of abutment stress is influenced by the key strata in the overlying strata.The key strata were fractured due to pressure-relief mining, and the abutment stress was only influenced by the key strata between the two seams.Therefore, the influ-ence distance of the abutment stress and the distance between the peak abutment stress and the panel were decreased.Due to the extraction of seam 5# in Tangshan coal mine, the abutment stress in panel Y485 located in seam 9# was only influenced by the key strata between the two seams.The influence distance of the abutment stress in panel Y485 decreased from 73 m to 38 m, and the distance between the peak abutment stress and the panel decreased from 29 m to 20.5 m.When there is a hard-and-thick key stratum present between two seams, the peak abutment stress is 2.34 times as great as that without one and severe stress concentration is formed during the lower seam extraction after pressure-relief mining.

关 键 词:深部开采 卸压开采 关键层 支承压力 

分 类 号:TD325[矿业工程—矿井建设]

 

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