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Experimental study of failure characteristics and fissure propagation in hydrous siltstone

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Abstract

The seepage-control design and evaluation of underground water conservancy projects need to consider the effects of water and original fissures on rock mechanical properties and fissure evolution laws. In this paper, uniaxial compression test was conducted on siltstone samples containing prefabricated fissures with different moisture contents to investigate the effects of fissure angle, ligament angle, and moisture contents on the mechanical properties and crack propagation. The results show that the peak stress, elastic modulus, and peak strain of rock are positively correlated with fissure angle and negatively correlated with the ligament angle. With increasing moisture content, the effects of fissure angle and ligament angle on rock mechanical properties gradually decrease, and the peak stress and elastic modulus are negatively linearly correlated with moisture content. The acoustic emission (AE) and photographic monitoring techniques were adopted to analyze the dynamic evolution laws of micro-crack propagation, and seven types of crack initiation and seven kinds of crack coalescence modes were summarized. The failure characteristics and crack coalescence of rock are controlled by fissure angle and ligament angle, and water content has an impact on the whole crack evolution process. This study provides a significant understanding of the instability and failure of underground rock engineering.

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Acknowledgments

The authors gratefully thank the anonymous reviewers for their constructive comments for improving the presentation. All authors have agreed to the listing of authors.

Funding

This research was funded by “the Fundamental Research Funds for the Central Universities,” grant number 2017XKZD06.

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Authors and Affiliations

  1. State Key Laboratory of Coal Resource and Safe Mining, China University of Mining & Technology, Xuzhou, 221116, China

    Yu Liqiang, Yao Qiangling, Li Xuehua, Wang Weinan & Han Hao

  2. School of Mines, China University of Mining & Technology, Xuzhou, 221116, China

    Yu Liqiang, Yao Qiangling, Li Xuehua, Wang Weinan, Han Hao & Zhang Mengting

Authors
  1. Yu Liqiang
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  2. Yao Qiangling
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  3. Li Xuehua
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  4. Wang Weinan
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  5. Han Hao
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  6. Zhang Mengting
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Contributions

Investigation, Hao Han; methodology, Mengting Zhang; data curation, Weinan Wang; writing—original draft preparation, Liqiang Yu; writing—review and editing, Qiangling Yao and Xuehua Li.

Corresponding author

Correspondence to Yao Qiangling.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Domenico M. Doronzo

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Yu, L., Yao, Q., Li, X. et al. Experimental study of failure characteristics and fissure propagation in hydrous siltstone. Arab J Geosci 13, 527 (2020). https://doi.org/10.1007/s12517-020-05522-4

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  • DOI: https://doi.org/10.1007/s12517-020-05522-4

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