浅部隔离煤柱对覆岩运移的控制及其合理留设
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作者单位:

1.河南财经政法大学BIM技术与智慧建造河南省工程实验室;2.江苏省地质调查研究院

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TD325

基金项目:

国家自然科学(41372163); 河南高等学校重点科研项目(19B170003)。Supported by National Natural Science Foundation of China (41372163); Key scientific research project in Henan Universities (19B170003).


Control of shallow coal pillar separation on overlying strata and its reasonable setting up
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1.BIM technology and intelligence construction in Henan Engineering Laboratory,Henan University of Economics and Law,Zhengzhou,Henan;2.Geological Survey of Jiangsu Province,Nanjing,Jiangsu

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    摘要:

    为了揭示西部浅埋工作面沿倾向方向开采时隔离煤柱对覆岩运移的控制作用,以大柳塔煤矿为工程背景,采用相似材料模拟实验方法,分析工作面开采过程中隔离煤柱对覆岩垮落、移动变形的控制作用,并分析煤柱应力变化特征及其合理留设。研究结果表明:2<sup>-2</sup>煤工作面沿倾向开采垮落空间呈不对称梯形,开切眼侧的破断角大于开采侧10°左右;覆岩垮落高度与工作面倾向开采长度密切关系,非充分采动较充分采动时覆岩垮落高度降低;采区倾向方向上,由于工作面间存在隔离煤柱,各工作面开采会形成彼此独立的垮落带,隔离煤柱有效地分隔了相邻工作面垮落空间的横向贯通和纵向扩展,隔开了相邻工作面上覆岩层沉降曲线。在煤层开采过程中,工作面间留设30m宽的隔离煤柱应力低于极限强度,煤柱处于稳定状态。理论计算出了2<sup>-2</sup>煤和5<sup>-2</sup>煤合理煤柱宽度分别为18.6m、24.5m,合理错距范围为95.5 m<Lσ<242.1 m。

    Abstract:

    In order to reveal the control effect of isolated coal pillar on overburden movement during mining along the dip direction of shallow buried working face in western China, the Daliuta coal mine is used as the engineering background, and the similar material simulation experiment method is used to analyze the isolation of the coal pillar against the overburden in the mining process. The control effect of moving deformation, and analysis of the characteristics of coal pillar stress change and its reasonable retention. The results show that the 2<sup>-2</sup> coal working face has an asymmetric trapezoid along the inclined mining space, and the breaking angle of the open cut side is more than 10° of the mining side; the overburden height is closely related to the working face"s tendency to mining. When the full mining is fully utilized, the height of the overburden fall is reduced; in the direction of the mining area, due to the existence of isolated coal pillars between the working faces, each working face will form separate falling belts, and the isolated coal pillars are effectively separated. The transverse penetration and longitudinal expansion of the collapsed space of adjacent working faces separate the settlement curves of the overburden layers on adjacent working faces. In the coal seam mining process, the 30m wide isolation coal pillar stress is lower than the ultimate strength, and the coal pillar is in a stable state. Finally, the theoretical calculation of the reasonable coal pillar width of 2<sup>-2</sup> coal and 5<sup>-2</sup> coal is 18.6m, 24.5m, and the reasonable misalignment range is 95.5 m <Lσ<242.1 m

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  • 收稿日期:2018-11-02
  • 最后修改日期:2019-01-11
  • 录用日期:2019-02-14
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