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Experimental investigation of mechanical damage and acoustic emission characteristics of tuff under triaxial compression

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Abstract

In this study, mechanical properties of saturated tuff with different weathering degrees under confining pressures of 0, 0.5, 2.5, and 5.0 MPa are systematically investigated by laboratory experiments with the aid of acoustic emission (AE) technology. Results reveal the influences of confining pressure and weathering degree on mechanical behaviors of saturated tuff, including elastic modulus, Poisson’s ratio, compressive strength, damage evolution, and failure mode. As the confining pressure builds up, the compressive strength and elastic modulus of the specimens increase linearly, the peak strain, deformation capacity and residual strength also increase apparently, and the ductile failure becomes more significant. The stress-strain curve at the initial loading stage shows a compaction segment, which becomes more prominent with the increase of weathering degree. AE data show that the fracture process of saturated tuff under triaxial compression can be divided into three stages: microcrack initiation stage, microcrack propagation stage, and macrocrack formation stage. In the fracture process of saturated tuff, the damage evolution is distinct. Based on the experimental results, a theoretical model of the stress-strain relationship of saturated tuff, which has taken into consideration various confining pressures, is constructed using the elastic-plastic theory.

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Acknowledgements

The authors are grateful for the financial support from the National Natural Science Foundation of China (No. 52039007) and the Natural Science Foundation for Excellent Young Scholars of Jiangsu Province (No. BK20190075).

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Authors and Affiliations

  1. College of Civil and Transportation Engineering, Hohai University, Nanjing, China

    Xudong Chen, Jiajia Wang & Zuoyu Li

  2. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, China

    Feng Dai & Mingdong Wei

Authors
  1. Xudong Chen
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  2. Jiajia Wang
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  3. Zuoyu Li
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  4. Feng Dai
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  5. Mingdong Wei
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Contributions

X.C.: conceptualization, methodology, validation, writing, and supervision. J.W.: data collection, investigation, and methodology. Z.L.: data collection, investigation, and visualization. F.D.: writing, editing, and supervision. M.W.: conceptualization, investigation, validation, writing, and editing.

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Correspondence to Mingdong Wei.

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The authors declare that they have no competing interests.

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Responsible Editor: Zeynal Abiddin Erguler

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Chen, X., Wang, J., Li, Z. et al. Experimental investigation of mechanical damage and acoustic emission characteristics of tuff under triaxial compression. Arab J Geosci 14, 2482 (2021). https://doi.org/10.1007/s12517-021-08711-x

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  • DOI: https://doi.org/10.1007/s12517-021-08711-x

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