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Experimental investigation on post-peak strength and deformation behavior of cracked sandstone

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Abstract

A series of triaxial compression experiments of intact and cracked sandstone with different degrees of damage were carried out using a rock mechanics servo-controlled system. Based on the experimental results, the influence of the confining pressure and damage on the peak strength, residual strength parameters, deformation parameters, and failure modes of cracked sandstone was investigated in detail. The results show that the strength and deformation behavior depends on not only the confining pressure but also the damage. The peak and residual strength of intact and cracked specimens increases linearly with increasing confining pressure, which is in good agreement with the linear Mohr-Coulomb criterion. The peak strength and equivalent cohesion of cracked specimens decreases linearly and exponentially with increasing damage, respectively. However, the internal friction angle is independent of damage. The elastic and secant modulus of cracked specimens increases linearly with increasing confining pressure but decreases with increasing damage. Then the effects of the confining pressure and damage on the peak strain and failure modes of cracked specimens are also analyzed in detail, indicating the transition of the failure modes from single shear failure to multiple shear failure with increasing damage.

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Acknowledgments

The authors would like to thank the editors and the anonymous reviewers for their helpful and constructive comments.

Funding

This research was supported by the National Natural Science Foundation of China (Grant No. 51574223), the China Postdoctoral Science Foundation (Grant No. 2015M571843), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20160208), the University Nature Science Research Projects of Jiangsu Province of China (Grant No.17KJB440003), and the Jiangsu University Overseas Research Program.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Yijiang Zong, Lijun Han, Yuhao Jin & Maolin Tian

  2. School of Traffic Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou, 221116, China

    Yijiang Zong & Dong Zhu

  3. Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK

    Yijiang Zong

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  1. Yijiang Zong
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  2. Lijun Han
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  3. Dong Zhu
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  4. Yuhao Jin
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  5. Maolin Tian
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Correspondence to Yijiang Zong.

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Responsible Editor: David Giles

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Zong, Y., Han, L., Zhu, D. et al. Experimental investigation on post-peak strength and deformation behavior of cracked sandstone. Arab J Geosci 13, 353 (2020). https://doi.org/10.1007/s12517-020-05379-7

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  • DOI: https://doi.org/10.1007/s12517-020-05379-7

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