Key Takeaways & Executive Findings
- •• Establishes a mechanical difference transfer model linking overlying rock caving to roadway deformation, identifying fracture morphology as the key to far-field stress disturbance. • Proposes regional stress control technology that blocks or reduces stress transfer, significantly reducing peak stress and surrounding rock deformation in deep mining roadways. • Provides a quantitative evaluation index for comprehensively analyzing factors influencing roadway stability under strong mining stress. • Offers practical reference for roadway support design in mines affected by severe mining-induced stress.
Abstract
Aiming at the problem that the distance between the main roadway and the working face in Hudi Coal Industry Panel was more than 100 m, which was still affected by mining, high stress concentration of the roadway, and difficulty of supporting overall convergence of the section, the mechanical characteristics of the core bearing strata of the overlying rock caving in the working face were studied. The correlation mechanism between the overlying rock caving and the deformation and failure of the roadway was analyzed, and the quantitative evaluation index was established to comprehensively analyze different influencing factors. Based on the key strata theory, the mechanical difference transfer model of working face mining and panel roadway deformation and failure was established. It was considered that the difference in fracture morphology was the key to the far-field stress disturbance. The regional stress control technology was proposed to block or reduce the stress transfer, so that the peak stress of the panel main roadway was reduced, and the deformation of the surrounding rock was significantly reduced, which provides a reference value for the roadway support with serious influence of mining roadway.
1. Introduction
With the development of coal resources mining in the direction of deep and intensive, as the core hub of mine production system, the problem of asymmetric failure under strong mining stress disturbance is becoming more and more prominent [1 −3]. In view of the surrounding rock control of mining roadway, scholars at home and abroad mainly focus on the optimization direction of supporting structure, and put forward new supporting technologies including high-strength prestressed anchor cable truss [4], asymmetric coupling support [5, 6], active and passive cooperative support [7], etc. By improving the stiffness of supporting body and coordinating the deformation ability, the active control of shallow surrounding rock is realized, and the active control mechanism of deep surrounding rock stress field is lack of systematic research. A paradigm shift from “structural reinforcement” to “stress control” is underway. This shift reconstructs the surrounding rock stress field through the construction of a stress transfer channel and the optimization of the energy release path. A three-dimensional mechanical model of the stress field around the hole was established, systematically revealing the evolution characteristics of the principal stress vector under different spatial orientations and its driving mechanism for roadway failure [8 −10]. The proposed “stress shielding effect around hole” explains the coupling law of hole shape and stress field distribution, and provides important theoretical support for stress control of deep surrounding rock.
In the aspect of regional stress control, many experts and scholars put forward the cantilever beam fracture structure [11], F structure of adjacent working face, T and L structures of isolated working face, arch structures, triangular plate structures and so on according to its caving characteristics. The research shows that the increase of roof pressure and the increase of influence range are affected by the synergy of weak rock strata. There are three main prevention and control methods: the mining of protective layer [12], the choice of development layout [13], and the pressure relief control of pre-splitting roof [14−16]. Based on the theory of short arm beam roof cutting, HE et al [17] put forward the technology of self-forming roadway without coal pillar roof cutting and pressure relief, including N00, 110, 121 construction methods, etc. WANG et al [18] and WANG et al [19] analyzed the main influencing factors of roof cutting roadway, including roof cutting angle, roof cutting height, roof cutting connectivity effect, charge size, blasthole distance, specific support parameters of roof cutting roadway, etc., and put forward the technology of “stress compensation + backfill mining + unloading control support”, which has been widely applied. MENG et al [20], ZHANG et al [21] and ZHANG et al [22] established a mechanical model after roof cutting, analyzed the stress distribution characteristics around the roadway, carried out zoning optimization treatment, analyzed the deformation mechani
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ZUO Jian-ping, ZHU Fan, MA Zong-yu, XU Cheng-yi (2025). Stress field evolution mechanism and regional stress control technology of deep mining roadway. Journal of Central South University. https://doi.org/10.1007/s11771-025-6089-x
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Frequently Asked Questions
What is the main problem addressed in this study?
The study addresses the issue of high stress concentration and difficult support in deep mining roadways, specifically when the main roadway is located more than 100 m from the working face and still affected by mining activities.
What is the proposed regional stress control technology?
The proposed technology aims to block or reduce stress transfer from overlying rock caving to the roadway, thereby reducing peak stress and deformation of surrounding rock. It involves methods like roof cutting and pressure relief.
How does the study analyze the stress field evolution mechanism?
The study establishes a mechanical difference transfer model based on key strata theory, linking overlying rock caving to roadway deformation. It identifies fracture morphology as the key factor in far-field stress disturbance.
What are the practical implications of this research?
The findings provide a reference for roadway support design in mines with severe mining-induced stress, offering a shift from structural reinforcement to stress control strategies.
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