ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 13 - 2025 | doi: 10.3389/feart.2025.1609397
This article is part of the Research TopicGeological Hazards in Deep Underground Engineering: Mechanism, Monitoring, Warning, and ControlView all 4 articles
Study on Structural Evolution Law of Overlying Rock Mass in Fully Mechanized Top-Coal Caving Face Under Open-Pit Slope with Extremely Thick and Hard Overburden
Provisionally accepted
- 1Chongqing Institute of Surveying and Mapping Science and Technology, Chongqing, China
- 2Chongqing University, Chongqing, China
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ABSTRACT：The study of overburden movement, damage, surface deformation, and fissuring caused by mining activities is crucial for ensuring coal mine safety and mitigating mining-induced damage. Based on the engineering background of a specific mine's 021N2 working face, this study develops structural mechanics models and conducts numerical simulations using PFC-2D. The results indicate that vertical displacement dominates in the rock-soil mass of the slope following mining activities. A force chain arch forms above the goaf, accompanied by stress fracturing and redistribution. Furthermore, mining activities result in significant air leakage between surface fissures and goaf areas, thereby posing risks of spontaneous combustion. This study provides a theoretical foundation and technical support for controlling thick overburden caving faces beneath open-pit slopes.
Keywords: thick overburden roof, Open-pit slope, PFC-2D simulation, stability analysis, Coal mine safety
Received: 10 Apr 2025; Accepted: 05 Jun 2025.
Copyright: © 2025 Chen, Luan, Xue, Wang, Tian, Qu, Yuan and Zhang. 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: Mingtian Zhang, Chongqing University, Chongqing, China
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