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首页> 外文期刊>Tunnelling and underground space technology >Engineering study on fracturing high-level hard rock strata by ground hydraulic action
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Engineering study on fracturing high-level hard rock strata by ground hydraulic action

机译：地面水力作用压裂高等级硬岩地层的工程研究

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摘要

The underground mining of extra-thick coal seams causes substantial migration of the overburden and generates extreme ground pressures. In view of the strong ground pressures produced by breakages and instabilities in high-level hard strata and the difficulties in their containment, we proposed an innovative solution to fracture high-level hard strata by ground hydraulic fracturing (GHF). Taking a 20 m thick coal seam in Tashan coal mine (Datong mine area, China) as an example, in situ ground hydraulic action experiments on the high-level hard rock strata was performed. In-situ measurements was performed to determine the key strata (KS) to be hydraulic fractured, and KS3 and KS4 were selected to be the target strata which were 110 m and 145 m away vertically above the coal seam, respectively. Fracturing was then performed using vertical wells. Micro-seismic measurements showed that the hydraulic fissure in KS3 is 250 m long, whereas 218 m in KS4. The fractured regions are 30-120 m in width. The hydraulic fissures in KS3 and KS4 exhibit an interlaced pattern that enhances the fracturing effect. Ground hydraulic action changed the fracturing structures of the high-level rock strata, thereby relieving the stress concentration around the working face. No strong strata behavior was observed on the working face after fracturing. The forces exerted on the supports was significantly reduced and the deformation of advanced roadways was controlled. This first-time field GHF experiment to control the strong strata behavior was successful, paving the way for new possibilities to high-level hard strata control for safety mining.
机译：特厚煤层的地下开采导致覆盖层大量迁移，并产生极大的地面压力。鉴于高级别硬岩层破裂和失稳所产生的强大地面压力以及其围堵的困难，我们提出了一种创新的解决方案，即通过地面水力压裂（GHF）来破碎高级别硬岩层。以塔山煤矿（中国大同煤矿区）20 m厚的煤层为例，对高等级硬岩层进行了现场地基水力作用试验。进行现场测量以确定水力压裂的关键层（KS），并选择KS3和KS4作为目标层，分别在煤层垂直上方110 m和145 m处。然后使用垂直井进行压裂。微震测量表明，KS3的水力裂缝长250 m，而KS4的水力裂缝长218 m。断裂区域的宽度为30-120 m。 KS3和KS4中的水力裂缝表现出交错的图案，从而增强了压裂效果。地面水力作用改变了高级岩层的压裂结构，从而减轻了工作面周围的应力集中。压裂后在工作面上未观察到强烈的地层行为。施加在支架上的力明显减小，并且可以控制先进道路的变形。这项用于控制强地层行为的首次野外GHF实验取得了成功，为安全开采的高级硬地层控制开辟了新的可能性。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第4期|156-164|共9页
  • 作者

    Yu Bin; Gao Rui; Kuang Tiejun; Huo Bingjie; Meng Xiangbin;

  • 作者单位

    Datong Coal Mine Grp Co Ltd, Datong 037000, Peoples R China|Taiyuan Univ Technol, Coll Min Engn, Taiyuan 030024, Shanxi, Peoples R China|China Univ Min & Technol, Minist Educ China, Sch Mines, Key Lab Deep Coal Resource Min, Xuzhou 221116, Jiangsu, Peoples R China;

    Taiyuan Univ Technol, Coll Min Engn, Taiyuan 030024, Shanxi, Peoples R China|China Univ Min & Technol, Minist Educ China, Sch Mines, Key Lab Deep Coal Resource Min, Xuzhou 221116, Jiangsu, Peoples R China;

    Datong Coal Mine Grp Co Ltd, Datong 037000, Peoples R China|China Univ Min & Technol, Minist Educ China, Sch Mines, Key Lab Deep Coal Resource Min, Xuzhou 221116, Jiangsu, Peoples R China;

    Liaoning Tech Univ, Sch Min, Fuxing 123000, Peoples R China;

    Datong Coal Mine Grp Co Ltd, Datong 037000, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Extra-thick coal seams; Hard rock strata; Ground hydraulic fracturing (GHF); Micro-seismic; Controlling effects;

    机译：特厚煤层;硬岩地层;地面水力压裂;微地震;控制效果;

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