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Contributory Factors and Distribution Characteristics of Asymmetric Deformation in Deep Tunnel

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Abstract

Aiming at the asymmetric deformation of the surrounding rock in deep tunnels, from the perspective of the mechanical environment of the rock layer, the physical characteristics of the surrounding rock and the geometric characteristics of the tunnel, five kinds of influencing factors for the asymmetric deformation of the tunnel surrounding rock were selected, and the change levels of various factors were established. Through orthogonal test methods, 25 sets of orthogonal test simulation schemes were designed to study the asymmetric deformation law of the surrounding rock of deep roadway under the combined action of various factors. Three surface displacements of the surrounding rock are used as indicators to weigh the influence of various factors on the asymmetric deformation of the surrounding rock. Through the Extreme Difference analysis and F Statistics comparison of the indicators, the dominant influencing factors affect the deformation of the surrounding rock are obtained. By studying the distribution of the maximum deformation position of the surrounding rock, we have obtained the asymmetry characteristics of the surrounding rock deformation. In addition, the simplified mechanical analysis of the key influencing factors of the deformation of the surrounding rock is given, and the distribution law of the asymmetric characteristics of the surrounding rock deformation is summarized. The above research can provide a certain theoretical reference for the asymmetric deformation control and supporting scheme design of the surrounding rock in deep roadway.

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Acknowledgements

The authors gratefully appreciate the support from the National Natural Science Foundation of China (51722904, 51679131, 51709159). Shandong Provincial Key R&D Program of China (2019GSF111030), Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) (No. 2019JZZY010601), Transportation Technology Program of Shandong Province, China (No. 2019B47_1). The authors would be grateful to the reviewers for their valuable comments and suggestions that can help improve the quality of the paper.

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Chen, Y., Gao, M., Li, L. et al. Contributory Factors and Distribution Characteristics of Asymmetric Deformation in Deep Tunnel. Geotech Geol Eng 39, 1223–1236 (2021). https://doi.org/10.1007/s10706-020-01555-4

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