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<p>Ground stress is the fundamental force that causes deformation, damage, and dynamic disasters in the surrounding rock and support, as well as in mines. A systematic study was conducted on the stress distribution characteristics of the Xing’an coal mine fault structure area in response to the frequent occurrence of coal and gas outbursts in the Hegang mining area, and the impact of structural stress on coal and gas outbursts was analyzed. Research has shown that when the normal fault was formed in the Xing’an coal mine, the maximum direction of the main stress in the mining area was in the horizontal direction, with a value of about 1.27 to 2.18 of the self-weight stress, indicating that the stress field in the mining area is dominated by the horizontal tectonic stress field. The maximum principal stress is approximately 2.01 to 2.22 times the minimum principal stress. The maximum principal stress azimuth angles of the three measuring points are 113.07 °, 69.16 °, and 86.6 °, respectively. The overall direction of the maximum horizontal principal stress is near EW. Fault zones are often prone to coal and gas outbursts, and geological structures formed by multiple faults have a more complex impact on the stress state of rock masses compared to single faults, resulting in a higher risk of gas outbursts. Therefore, the wellfield area is divided into stress increasing zone, stress decreasing zone, and stress gradient zone. <i>K</i> is the stress concentration factor, <i>σ</i><sub>1</sub> is the regional rock mass stress value, and <i>γ</i> is the original rock stress. <i>K</i> = <i>σ</i><sub>1</sub>/<i>γ</i>. When <i>K</i>&#xa0;is greater than 1.2, the range delineated by the contour line of the corresponding maximum principal stress value is the high-stress zone; when <i>K</i> is less than 0.8, the range delineated by the corresponding contour line of the maximum principal stress is the low-stress zone. The stress gradient zone is located between these two regions. The stress reduction zone is mainly located near the fault zone, with a stress range from 12 to 24 MPa. The stress increase zone is mainly located at the composite and end of the fault, with a maximum stress of up to 40 MPa. Gas outburst accidents often occur in this area.</p>

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Study on the Influence of Stress Distribution in Fault Structural Zones on Coal and Gas Outbursts

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Weiwei Li,
  • Tianrang Jia,
  • Yongkun Zhu,
  • Shuaichang Guo

摘要

Ground stress is the fundamental force that causes deformation, damage, and dynamic disasters in the surrounding rock and support, as well as in mines. A systematic study was conducted on the stress distribution characteristics of the Xing’an coal mine fault structure area in response to the frequent occurrence of coal and gas outbursts in the Hegang mining area, and the impact of structural stress on coal and gas outbursts was analyzed. Research has shown that when the normal fault was formed in the Xing’an coal mine, the maximum direction of the main stress in the mining area was in the horizontal direction, with a value of about 1.27 to 2.18 of the self-weight stress, indicating that the stress field in the mining area is dominated by the horizontal tectonic stress field. The maximum principal stress is approximately 2.01 to 2.22 times the minimum principal stress. The maximum principal stress azimuth angles of the three measuring points are 113.07 °, 69.16 °, and 86.6 °, respectively. The overall direction of the maximum horizontal principal stress is near EW. Fault zones are often prone to coal and gas outbursts, and geological structures formed by multiple faults have a more complex impact on the stress state of rock masses compared to single faults, resulting in a higher risk of gas outbursts. Therefore, the wellfield area is divided into stress increasing zone, stress decreasing zone, and stress gradient zone. K is the stress concentration factor, σ1 is the regional rock mass stress value, and γ is the original rock stress. K = σ1/γ. When K is greater than 1.2, the range delineated by the contour line of the corresponding maximum principal stress value is the high-stress zone; when K is less than 0.8, the range delineated by the corresponding contour line of the maximum principal stress is the low-stress zone. The stress gradient zone is located between these two regions. The stress reduction zone is mainly located near the fault zone, with a stress range from 12 to 24 MPa. The stress increase zone is mainly located at the composite and end of the fault, with a maximum stress of up to 40 MPa. Gas outburst accidents often occur in this area.