ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
This article is part of the Research TopicFailure Analysis and Risk Assessment of Natural Disasters Through Machine Learning and Numerical Simulation, volume VView all 4 articles
Research on surrounding rock-composite arch coupling support models considering pre-tightening force strengthening coefficients
Provisionally accepted
Zhongwei Li1,2
Xiang Li3*- 1CCTEG Coal Mining Research Institute Co Ltd, Beijing, China
- 2Tiandi Science & Technology Co Ltd, Beijing, China
- 3Wuhan University of Technology, Wuhan, China
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With increasing coal mining depth, underground geological conditions grow more complex. Surrounding rock stability control has become a critical bottleneck for safe coal mining. Thus, there is an urgent need to develop more reliable support theories for optimizing engineering support parameters. Based on the surrounding rock strength enhancement theory, this study constructs a coupling support model integrating pre-tightening force reinforcement and composite arch support principles. Through single-factor variable analysis, we investigate the influence of bolt support parameters on anchorage body strength. The results show that: bolt length correlates positively with anchorage body support strength, enabling effective reinforcement through adjusting the thickness of the composite arch. Bolt spacing correlates negatively with support strength. Excessive spacing hinders effective superposition of conical compressive stress zones from individual bolts, impeding continuous composite arch structures formation. Pre-tightening force consistently enhances surrounding rock mechanical properties, steadily increasing anchorage body support strength. Comparative calculations on actual coal mine roadway bolt support designs verify the effectiveness of this coupling support model.
Keywords: Bolt support, Composite arch, Pre-tightening force, Surrounding rock stability, couplingsupport model
Received: 06 Oct 2025; Accepted: 04 Nov 2025.
Copyright: © 2025 Li 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: Xiang Li, lixiang01@whut.edu.cn
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