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Mechanical properties of limestone from Maixi tunnel under hydro-mechanical coupling

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Abstract

The hydro-mechanical coupling often leads to both mechanical properties and stability deterioration during excavation of water-rich tunnel rock mass. Deformation and mechanical, fracture, and strain energy characteristics of limestone from Maixi tunnel in Guiyang (China) are investigated by hydro-mechanical coupling tests in this paper. Results show that the water pressure has a significant influence on the stress-strain curve, strength characteristics, and macro-fracture degree. The compaction stage is relatively prolonged and elastic phase is shortened. With increasing water pressure, average peak strength decreases exponentially and both average elastic modulus and deformation modulus decrease linearly. The larger the water pressure, the better the fragment uniformity, and fragment uniformity increases exponentially but decreases logarithmically with peak strength. Mercury-injection curve shows a rapid increase then develops gently; the pore volume per unit mass increases exponentially revealing that water pressure has a significant effect on the dissolution pores. Strain energy dissipation characteristics show that total strain energy, dissipation strain energy, and releasable strain energy decrease exponentially with increasing water pressure. Energy ratio Ud/Ut experiences a slow increase, then dramatic rise, and finally develops gently, but Ue/Ut goes through a negative development tend and its boundary points of water pressure are both 2 MPa and 4 MPa. Ud/Ut has a typical logistic function with water pressure reflecting the damage degree and sensitivity of dissipation strain energy to water pressure.

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Acknowledgments

We thank the reviewers and editors for their comments and suggestions for the manuscript.

Funding

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51578447) and Natural Science Basic Research Program of Shaanxi (2019JQ-762) and Project funded by China Postdoctoral Science Foundation (2018M643809XB) and Project Foundation of Department of Housing and Urban Rural Development of Shaanxi Province (2019-K39).

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Prof. Zhanping Song conceived the experiments and edited the paper. Dr. Yun Cheng and Tengtian Yang tested the data and wrote the article. Prof. Junbao Wang guided the implementation of experiments and edited the paper. Dr. Xiaoxu Tian provided the rock samples and tested the data.

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Correspondence to Zhanping Song or Yun Cheng.

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The authors declare that they have no conflict of interest.

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Responsible editor: Zeynal Abiddin Erguler

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Song, Z., Cheng, Y., Tian, X. et al. Mechanical properties of limestone from Maixi tunnel under hydro-mechanical coupling. Arab J Geosci 13, 402 (2020). https://doi.org/10.1007/s12517-020-05373-z

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  • DOI: https://doi.org/10.1007/s12517-020-05373-z

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