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Experimental study on the mechanical properties of water-rich mudstone under principal stress axis rotation

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Abstract

To study the influence of stress axis rotation on the strength of water-rich soft rock in the process of mine construction, the GDS hollow cylinder testing system was adopted to conduct directional shear testing and pure principal stress axial rotation testing on water-rich mudstone in different principal stress directions with the soft rock in the roadway engineering project of the Hongqingliang Coal Mine as a research object. The strain variation law and non-coaxial characteristics of water-rich soft rockwater-rich soft rock under the rotation of two different stress directions were studied. Additionally, two types of soft rocks with different water contents were compared (natural soft rock and water-rich soft rock) and the results indicated that the deformation of water-rich mudstone is accumulated with the rotation of the principal stress axis. The deformation of the water-rich mudstone was greater than that of the natural mudstone and it exhibited non-coaxial characteristics. The non-coaxial angle of water-rich mudstone is correlated with the principal stress rotation angle α and medium principal stress coefficient b to some extent. The smaller the medium principal stress coefficient b, the larger the non-coaxial angle. When b = 0, the maximum non-coaxial angle is 3.2°. Based on the test results and waveform function model, an empirical equation of the non-coaxial angle of argillaceous water-rich mudstone under the principal stress axis rotation is established, which can effectively predict the non-coaxial angle variation law of water-rich mudstone under the stress axis rotation.

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Acknowledgements

The authors gratefully acknowledge the helpful comments of the reviewers and also thank Editage (www.editage.cn) for English language editing.

Funding

This research was supported by the State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (grant no. SKLGDUEK1914), and the National Natural Science Foundation of China (grant no. 51774166).

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Authors and Affiliations

  1. College of Civil Engineering, Liaoning Technical University, Fuxin, Liaoning, 123000, People’s Republic of China

    Xiangdong Zhang, Xuefeng Zhang, Jiashun Liu, Kaixin Zhu & Yu Ren

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  1. Xiangdong Zhang
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  2. Xuefeng Zhang
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  3. Jiashun Liu
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  4. Kaixin Zhu
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  5. Yu Ren
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Correspondence to Xuefeng Zhang.

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Responsible Editor: Zeynal Abiddin Erguler

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Zhang, X., Zhang, X., Liu, J. et al. Experimental study on the mechanical properties of water-rich mudstone under principal stress axis rotation. Arab J Geosci 15, 65 (2022). https://doi.org/10.1007/s12517-021-09340-0

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