Coal Engineering ›› 2025, Vol. 57 ›› Issue (4): 75-81.doi: 10. 11799/ ce202504011

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Research on strong mine pressure behavior and the control technology in an extra-thick coal seam working face

LI Jiang   

  • Received:2024-05-11 Revised:2024-08-09 Online:2025-04-10 Published:2025-05-28
  • Contact: LI Jiang E-mail:123166769@qq.com

Abstract:

In response to the problem of strong mining pressure manifestation in the working face, taking the 61607 working face of longwanggou coal mine as the engineering background, the characteristics of strong mining pressure manifestation in the working face and the distribution law of mining stress were systematically analyzed through theoretical calculation and on-site measurement. Based on this, a strong mining pressure control measure combining “conventional hydraulic fracturing+directional drilling hydraulic fracturing” was proposed. The results showed that the influence range of advanced support pressure in the working face was about 140 m, The distance between the peak point of support pressure and the coal wall is about 50 m. After adopting the roof pre cracking measure in the working face, the parameters such as cyclic pressure step distance and pressure duration have decreased by 26.05% and 41.56%, respectively. Microseismic events also show a clear distribution pattern of “high frequency+low energy”, with significant effects, it can provide reference significance for exploring strong mining pressure control technology for similar mines in the surrounding area.

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