Key Takeaways & Executive Findings
- •• A novel physical simulation test system successfully reproduced both high stress and fault slip dynamic impact phenomena in deep roadways. • High stress dynamic impact induces symmetric damage with high energy release, while fault slip dynamic impact causes asymmetric damage via unilateral stress wave propagation. • Comparative analysis revealed distinct stress evolution, roadway deformation, and support force responses for the two dynamic impact types. • Differentiated control concepts are proposed for mitigating high stress versus fault slip dynamic impact hazards in deep roadways.
Abstract
As coal mining depth increases, the combined effects of high stress, mining stress, and fault structures make dynamic impact hazards more frequent. The reproduction of dynamic impact phenomena is basis for studying their occurrence patterns and control mechanisms. Physical simulation test represents an efficacious methodology. However, there is currently a lack of simulation devices that can effectively simulate two types of dynamic impact phenomena, including high stress and fault slip dynamic impact. To solve aforementioned issues, the physical simulation test system for dynamic impact in deep roadways developed by authors is employed to carry out comparative tests of high stress and fault slip dynamic impact. The phenomena of high stress and fault slip dynamic impact are reproduced successfully. A comparative analysis is conducted on dynamic phenomena, stress evolution, roadway deformation, and support force. The high stress dynamic impact roadway instability mode, which is characterized by the release of high energy accompanied by symmetric damage, and the fault slip dynamic impact roadway instability mode, which is characterized by the propagation of unilateral stress waves accompanied by asymmetric damage, are clarified. On the basis, the differentiated control concepts for different types of dynamic impact in deep roadways are proposed.
1. Introduction
With the gradual depletion of shallow coal resources, coal mining continues to move towards the deep parts of the earth, and deep mining will become a common phenomenon [1,2]. Under the influence of high stress and strong mining stress in deep areas, the surrounding rock in the roadway is prone to forming high stress energy accumulation zones, and the sudden release of accumulated energy can easily induce dynamic impact hazards [3–5]. Especially in areas affected by fault slip, stress waves generated by fault slip are transmitted to high stress roadways, making dynamic impact hazards more frequent and seriously threatening mine safety production [6–9]. Clarifying the influence law of fault slip on the dynamic impact, as well as the differences in the mechanism and characteristics of dynamic impact between roadways with the influence of high stress and fault slip, is a prerequisite for targeted safety control of different types of deep roadways.
Many scholars have conducted extensive research using numerical software such as FLAC3D, 3DEC, ABAQUS, etc., to investigate the occurrence laws of dynamic impact in deep roadways [10–15]. By establishing numerical models for different types of deep coal mining working faces, the distribution characteristics and evolution laws of high stress concentration areas in roadways during the mining process are analyzed, and the reasons for high stress dynamic impact hazards in roadways are clarified [14]. The generation of mining space provides the possibility for fault slip, as coal mining is located in a fault structure area. If a roadway dynamic impact hazard is induced by fault slip, it will exhibit a different hazard causing law from the dynamic impact caused only by high stress. Therefore, scholars have used numerical simulation methods to study the stress evolution of surrounding rock, the activation law of faults, and the characteristics of roadway failure during the process of advancing the working face towards the fault plane [15]. The aforementioned scholars have used numerical simulation methods to study the disaster causing process of dynamic impact hazards in roadways with and without the influence of fault structures, which has obtained important research results. However, the true reproduction of the dynamic impact
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Qi Wang, Yuncai Wang, Zhenhua Jiang, Hongpu Kang, Chong Zhang, Bei Jiang (2025). Dynamic impact simulation tests of deep roadways affected by high stress and fault slip. SinoTechIntel Verified Research. https://doi.org/10.1016/j.ijmst.2025.03.005
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Frequently Asked Questions
What is the main objective of the study on deep roadways?
The study aims to reproduce and compare two types of dynamic impact phenomena in deep roadways—high stress and fault slip—using a physical simulation test system, and to clarify their distinct instability modes and control concepts.
How were the dynamic impact phenomena simulated in the research?
The authors employed a self-developed physical simulation test system for dynamic impact in deep roadways to conduct comparative tests, successfully reproducing both high stress and fault slip dynamic impact phenomena.
What are the key differences between high stress and fault slip dynamic impact?
High stress dynamic impact is characterized by high energy release with symmetric damage, while fault slip dynamic impact involves unilateral stress wave propagation leading to asymmetric damage.
What are the practical implications of this research?
The findings provide a basis for differentiated control strategies for different types of dynamic impact hazards in deep roadways, enhancing mine safety and support design.
Which methods were used in the study?
The study primarily used physical simulation tests, complemented by comparative analysis of dynamic phenomena, stress evolution, roadway deformation, and support force.
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