煤炭工程 ›› 2025, Vol. 57 ›› Issue (7): 127-135.doi: 10. 11799/ ce202507018

• 研究探讨 • 上一篇    下一篇

浅埋薄基岩8m超大采高工作面矿压显现与开采沉陷规律协同分析

任建喜,孙成伟,张金贵,等   

  1. 1. 西安科技大学 建筑与土木工程学院,陕西 西安 710054

    2. 中国矿业大学(北京)能源与矿业学院,北京 100083

    3. 陕煤集团神木张家峁矿业有限公司,陕西 神木 719300

  • 收稿日期:2024-08-06 修回日期:2024-10-04 出版日期:2025-07-11 发布日期:2025-08-14
  • 通讯作者: 任建喜 E-mail:renjianxi1968@163.com

Synergistic analysis of the mine pressure behavior and surface subsidence law of the 8 meter ultra-high working face in shallow coal seam

  • Received:2024-08-06 Revised:2024-10-04 Online:2025-07-11 Published:2025-08-14

摘要:

为研究8m超大采高工作面回采诱发的矿压显现与地表沉降规律,在陕煤集团张家峁煤矿2203工作面井下工作面布置了应力监测系统和在地表布置了GNSS自动观测站的研究手段,对该工作面回采期间的矿压显现规律及地表沉降特征进行了协同分析。结果表明:8m超大采高2203工作面的矿压显现来压区域性明显,表现为工作面倾向支架工作阻力呈“中间大两端小”分布。较普通采高相比,超大采高工作面由于开采空间大,顶板承载的重量增加,导致工作面支架承受的压力更大,矿压显现更剧烈;超大采高工作面的来压周期通常较长,周期性来压的强度较高,呈大小周期交替的规律;超大采高在来压时,支架增阻急剧上升,且增阻幅度较大。8m超大采高2203工作面地表沉降活跃期较短,期间下沉速度较大,地表沉降剧烈,但衰退期较长;工作面回采所诱发的地表沉降的影响范围较大、但显著沉降区域较小、沉降所形成的盆地呈“倒立草帽”状;地表裂缝发育明显,裂缝宽度较大,主要发生在工作面采空区中部,呈非闭合环状分布,整个工作面地表破坏严重,形成了明显的台阶状裂缝;与普通采高工作面相比超大采高工作面回采引起的地表沉降量与沉降范围更大,下沉速度更快,持续时间更长。8m超大采高2203工作面地表发生沉降前1~5d内工作面会来压,由此看出矿压显现对地表沉降有预警作用,之后随着周期来压的不断显现,地表沉降经历缓慢沉降、快速沉降阶段和沉降稳定三个阶段,快速沉降阶段较缓慢沉降和沉降稳定阶段的井下矿压显现更加频繁且剧烈,来压次数增多,来压步距减小,来压持续时间增大,工作面推进速度越快,地表的下沉速度越大。

关键词:

浅埋煤层 , 8m超大采高 , 地表沉降 , 矿压显现 , 矿压实测

Abstract:

In order to study the mine pressure manifestation and surface settlement law induced by 8-meter super-high working face mining, the study means of arranging stress monitoring system in the underground working face of 2203 working face of Zhangjiamao Coal Mine of Shaanxi Coal Group and arranging GNSS automatic observatory in the surface were used to collaboratively analyze the mine pressure manifestation law and surface settlement characteristics during the period of mining of this working face. The mine pressure at the 8-meter super-large mining height of the 2203 working face exhibits distinct regional pressure, with a pattern of "higher in the middle and lower at both ends" in the working resistance of the support. Compared to ordinary mining heights, the larger mining space and the increased load from the roof in super-large mining faces result in greater pressure on the support, leading to more severe mine pressure. The periodic pressure cycles in super-large mining faces are generally longer, with high pressure intensity, following a pattern of alternating large and small cycles. When the super-large mining face experiences pressure, the support resistance increases sharply, with a significant amplitude of resistance growth. 8m super high 2203 working face has a shorter active period of surface subsidence, and the sinking speed is bigger during the period, and the surface subsidence is violent, but the recession period is longer; the influence range of the surface subsidence induced by the mining back of the working face is bigger, but the area of significant subsidence is smaller, and the basin formed by the subsidence is in the shape of an "inverted straw hat"; The surface cracks are obviously developed, with large widths, mainly in the middle of the working face's hollow area, distributed in a non-closed ring, and the surface of the whole working face is seriously damaged, forming obvious step-like cracks; the amount and scope of surface settlement caused by the mining back of the oversized working face are larger, and the rate of subsidence is faster and lasts for a longer time than that of the ordinary working face.8 The surface of 2203 working face of 8m super high mining height will come to pressure in 1~5d before the settlement, which shows that the mine pressure will show on the surface settlement has a warning effect, and then with the cycle of coming to pressure, the surface settlement goes through the slow settlement, rapid settlement stage and settlement stabilization stage, the rapid settlement stage is more frequent than the slow settlement and settlement stabilization stage of the downhole mine pressure shows more frequently and violently, the number of times of coming to pressure increases, the step distance of coming to pressure decreases, the downward speed of settlement is faster, and the duration is longer. The number of incoming pressures increases, the step size of incoming pressures decreases, the duration of incoming pressures increases, and the faster the working face advances, the greater the subsidence rate of the ground surface;. The research results provide technical support for this working face and the subsequent similar working faces.

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