Abstract
The problem of the hard roof hanging in deep mines may cause large deformations of roadways, which even jeopardizes the safety of personnel. Finding an effective and safe method to reduce the high stress caused by that is of significance. In this study, the stress relief technique was employed to 6305 working face in the Dongtan coal mine to maintain the roadway stability. The theoretical analysis, numerical modeling, and field practice were utilized to investigate the effect of the stress relief technique on the main hard roof. The range of pre-splitting cutting angles by stress relief technique was first analyzed theoretically. Furthermore, the stress evolution of the surrounding rock along the goaf, the best breaking position, and patterns of the main roof were obtained by numerical simulation. Also, the field test was carried out and the results showed that the total deformation of roadway is controlled within 30–60 mm, and the change rate of anchor cable stress is controlled within the range of 13 to 16%, ensuring the long-term stability of the roadway along the goaf. Successful practical engineering provides a guideline in similar conditions especially for the stability of deep underground space under high-stress environments.
Article highlights
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A systematical study of the stress relief technique in deep mines from theoretical analysis to field application.
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The best cutting angles along hard roof goaf is 75° based on the universal distinct element simulation.
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The designed parameters achieved less roadway deformation by the field monitoring.
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Acknowledgements
The authors are grateful to Shandong Mining (Group) Co. Ltd.
Funding
This research was supported by the projects of “the Fundamental Research Funds for the Central Universities (2020ZDPY0221, 2021QN1003)”, “National Natural Science Foundation of China (52104106, 52174089)”, “Basic Research Program of Xuzhou (KC21017)”.
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Conceptualization by YS and GL; methodology, JH; investigation, JZ; writing—original draft preparation, YS; writing—review and editing, GL, JS, JZ, RB, RT; supervision, GL; funding acquisition, GL.
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Sun, Y., Bi, R., Sun, J. et al. Stability of roadway along hard roof goaf by stress relief technique in deep mines: a theoretical, numerical and field study. Geomech. Geophys. Geo-energ. Geo-resour. 8, 45 (2022). https://doi.org/10.1007/s40948-022-00356-8
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DOI: https://doi.org/10.1007/s40948-022-00356-8