ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 13 - 2025 | doi: 10.3389/feart.2025.1633751
This article is part of the Research TopicGeological Hazards in Deep Underground Engineering: Mechanism, Monitoring, Warning, and ControlView all 5 articles
Surrounding Rock Control Technology of Large-section Open-off Cut with Composite Roof under Deep Mining Conditions: A Case Study
Provisionally accepted
- China University of Mining and Technology, Xuzhou, China
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This study addresses the critical challenge of maintaining surrounding rock stability in the large-section open-off cuts with composite roofs, using the 11211 working face in Yanchang Petroleum Kekegai Coal Mine as a case study. Through integrated field measurements, theoretical analysis, numerical modeling, and industrial experiments, we systematically examine the failure mechanisms of surrounding rock and propose corresponding control strategies. Key findings include: (1) The composite roof exhibits weak interlayer bonding and undergoes progressive bending-delamination-fracture failure under stress, requiring a high-strength coupled support system. (2) Based on pressure arch theory, we evaluate the damage range of surrounding rock in the open-off cut and derive optimal bolt and anchor cable support parameters. (3) FLAC 3D simulations demonstrate significant positive correlations between stress concentration coefficient, displacement, plastic zone height, and open-off cut span.Through eight support scheme groups and prestress distribution analysis, we determine optimal anchor cable spacing and length.(4) We propose a combined bolt-cable support strategy for large-section open-off cuts with composite roofs. Field tests showed that the roof-floor displacement was limited to 70 mm and lateral convergence was controlled at 44 mm. This support system effectively controls surrounding rock deformation while significantly enhancing structural stability. This research provides theoretical guidance and engineering references for large-section open-off cuts support in similar geological conditions.
Keywords: Composite roof, Large section, Open-off cut, Pressure arch, bolt and anchor cable support
Received: 23 May 2025; Accepted: 17 Jul 2025.
Copyright: © 2025 Xu, ZHOU and Wang. 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: Qingcong ZHOU, China University of Mining and Technology, Xuzhou, China
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