煤炭工程 ›› 2024, Vol. 56 ›› Issue (9): 146-151.doi: 10.11799/ce202409022

• 研究探讨 • 上一篇    下一篇

鸡西矿区浅埋煤层矿井地应力分布规律研究

武龙云   

  1. 1. 中煤科工开采研究院有限公司,北京 100013

    2. 天地科技股份有限公司 开采设计事业部,北京 100013

  • 收稿日期:2024-08-01 修回日期:2024-09-09 出版日期:2023-09-20 发布日期:2025-01-08
  • 通讯作者: 武龙云 E-mail:wly.wx@qq.com

Study on in-situ stress distribution law of shallow coal seam mine in Jixi mining area based on hydraulic fracturing method

  • Received:2024-08-01 Revised:2024-09-09 Online:2023-09-20 Published:2025-01-08

摘要:

为探究鸡西矿区浅埋煤层矿井地应力分布规律, 采用水压致裂法在4座代表性矿井的23个测点开展地应力测试,分析了岩性对矿区地应力场分布规律的影响。结果表明:测试矿井垂直主应力比最大水平主应力要小,水平应力占地应力主要部分,构造应力场特征显著;无超高地应力场区,低、中及高地应力场区均有分布,以低及中等地应力场区为主;水平主应力总体上与埋深呈正相关关系,最小水平主应力与埋深相关性相较最大水平主应力要差;侧压比处于1.16~5.28范围且全部超过1,随埋深增加,侧压比整体逐渐减小,但离散性加强;随着埋深增加,最大、最小主应力相对差值有增大趋势,水平主应力差比逐渐接近0.5,矿井不同开采水平水平主应力差均较大。该研究成果对于鸡西矿区浅埋煤层矿井采掘工程设计及围岩控制具有重要的指导意义。

关键词: 鸡西矿区, 浅埋煤层矿井, 水压致裂, 原岩应力

Abstract:

Abstract:In order to investigate the distribution law of ground stress in shallow coal seam in Jixi mining area, the hydraulic fracturing method is used to carry out ground stress testing at 30 measuring points in 5 representative mines, and the measured results are analyzed deeply. The results show that the vertical principal stress is smaller than the maximum horizontal principal stress, the horizontal stress occupies the main part of the stress, and the tectonic stress field is prominent. There is no ultra-high stress field, but low, medium and high stress field are distributed, mainly low and medium stress field. The maximum horizontal principal stress direction of six Wells in Lushan Coal Mine and droplet clean coal mining area No. 9 is concentrated in NE; The maximum horizontal principal stress direction of Donghai Coal Mine and Erdaohezi Coal mine is concentrated in NW; The direction of the maximum horizontal principal stress at 3 measuring points is concentrated in NE, and the direction of the maximum horizontal principal stress at 6 measuring points is concentrated in NW. The horizontal principal stress is positively correlated with the buried depth in general, and the correlation between the minimum horizontal principal stress and the buried depth is worse than that of the maximum horizontal principal stress. The side pressure ratio was in the range of 1.16-5.28 and all exceeded 1. With the increase of buried depth, the side pressure ratio gradually decreased, but the dispersion was strengthened. With the increase of buried depth, the relative difference of maximum and minimum principal stress tends to increase, and the horizontal principal stress difference ratio gradually approaches 0.5. The horizontal principal stress difference of different mining levels is larger. The research results have important guiding significance for mining engineering design and surrounding rock control of shallow coal seam in Jixi mining area.

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