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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 12 - 2024 | doi: 10.3389/feart.2024.1485210
This article is part of the Research Topic Prevention, Mitigation, and Relief of Compound and Chained Natural Hazards Volume II View all 7 articles

Research and application of hydraulic fracturing axial roof cutting technology for gently inclined hard roof based on abra-sive jet

Provisionally accepted
Ruda SUN Ruda SUN 1,2*Zhipeng Zhao Zhipeng Zhao 3Wei Yang Wei Yang 3Hongping Li Hongping Li 3
  • 1 China Coal Research Institute (China), Beijing, China
  • 2 Coal Mining & Designing Department, Tiandi Science & Technology Co., Ltd, beijing, China
  • 3 Xinjiang Energy Co., Ltd., CHN Energy, Erumqi, China

The final, formatted version of the article will be published soon.

    In order to explore a new method and mode of gently inclined hard roof treatment, the hydraulic fracturing axial roof cutting technology based on abrasive jet is introduced, and the key technical parameters of abrasive jet axial cutting and fracturing are determined based on indoor experiments and field industrial experiments. Taking the mining of working face under the condition of hard roof in Kuangou Coal Mine as the background, the implementation process and the effect of mining process are tested by means of water pressure gauge, drilling peep and observation well water level observation, mi-croseismic monitoring, support fracture monitoring and coal stress monitoring. The research results show that the key technical parameters of slotting and fracturing are mastered in the axial cutting test of abrasive jet. Wherein the kerf depth is 200m, the kerf length is 300m, the kerf pressure is 40-50mpa, the fracturing pressure is 50-55mpa, and the fracturing time is 20-30min. After grooving fracturing, the cracks in the roof strata are effectively generated and expanded, which destroys the integrity of the roof, and the fracturing radius is 10-20m. During the mining period, compared with the tradi-tional blasting technology, the concentrated area of microseismic events was shifted from 80m in front of the working face to 130m after the combined treatment of abrasive jet axial roof cutting and blasting, and the microseismic energy release was mainly small energy events. After the application of abrasive jet axial roof cutting and scour prevention technology in hard roof, the periodic weighting step is obviously reduced, the influence range of mining stress and stress concentration coefficient are obviously reduced, the activity intensity and dynamic load effect of surrounding rock are obviously weakened. The research results provide a basis for effective prevention and control of rockburst disasters under the condition of hard roof.

    Keywords: hard roof, Rockburst, hydraulic fracturing, pressure relief regulation, axial fracture cutting and fracturing of abrasive jet

    Received: 23 Aug 2024; Accepted: 07 Oct 2024.

    Copyright: © 2024 SUN, Zhao, Yang and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Ruda SUN, China Coal Research Institute (China), Beijing, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.