Abstract
The asymmetric and large deformation of roadways under non-uniform pressure caused by a mining disturbance has been a difficulty in many coal mines in China. In this paper, the characteristics and types of non-uniform pressure stress fields are analyzed by numerical simulation. Then, a detailed numerical modeling is established to study the deformation and failure mechanism under different types of non-uniform pressure stress. A new support system of “bolt-cable-shotcrete-deep and shallow holes grouting” is proposed to control the deformation of the roadway under non-uniform pressure, and the numerical simulation and in situ monitoring test are performed to prove control effect. The results show that there are two main types of non-uniform pressure stress fields: V-shaped and oblique line-shaped fields above the roadway under a mining disturbance. The plastic zone, asymmetric deformation, and non-uniformity indices of the roadway increase with the increase in deviation coefficient, and the failure of the surrounding rock is mainly shear failure, which is accompanied by a small amount of local tensile failure. The numerical simulation and in situ monitoring indicate that the new support scheme can effectively control the asymmetric and large deformation of the No. 20101 belt roadway, which can provide references for studies of the deformation failure and scientific control technology of roadways under non-uniform pressure.
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Acknowledgements
The authors are much grateful to the reviewers and the Editor-in-Chief Professor Louis Wong for their valuable comments and suggestions, which have greatly improved the manuscript presentation.
Funding
This work was supported by the National Natural Science Foundation of China (NSFC) (grant numbers 51574223, 51704183, and 51704280) and Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team (Disaster prevention and control team of underground engineering involved in sea).
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Tian, M., Han, L., Yang, X. et al. Asymmetric deformation failure mechanism and support technology of roadways under non-uniform pressure from a mining disturbance. Bull Eng Geol Environ 81, 211 (2022). https://doi.org/10.1007/s10064-022-02710-2
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DOI: https://doi.org/10.1007/s10064-022-02710-2