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Fracture evolution and energy mechanism of deep-buried carbonaceous slate

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Abstract

In order to study the influence of confining pressure and water content on the mechanical properties, fracture evolution and energy damage mechanism of deep-buried carbonaceous slate, uniaxial and triaxial compression tests were carried out under natural and saturated states and acoustic emission monitored. The deep-buried carbonaceous slate samples were obtained at a depth of 1020 m from the Lanjiayan tunnel in Sichuan province, China, where the maximum in situ stress has been measured at 44.2 MPa. The results suggest that water has a significant softening effect on the strength and deformation characteristics of carbonaceous slate, but the effect decreases with an increase in the confining pressure. When both the confining pressure and water content are increased, the acoustic emission events and dissipated energy gradually increase at the pre-peak and post-peak stages. Thus, the AE evolution type seen in the natural state under low confining pressure usually presents as a main shock-type event, and it changes to a foreshock–main shock–after shock event when saturated and at high confining pressures. Based on the S-shaped energy evolution law, the damage evolution process of carbonaceous slate was analyzed. The damage stress thresholds σ ea and σ eb were obtained, which can be considered as the thresholds of the rock entering the energy-hardening and energy-softening stages. Finally, a new brittleness energy index BDE is proposed to describe the influence of confining pressure and water content on the damage mechanism of deep-buried carbonaceous slate.

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Acknowledgements

This research was financially supported by the National Key R&D Program of China (Nos. 2016YFC0802201 and 2016YFC0802210) and Doctoral Innovation Fund Program of Southwest Jiaotong University.

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Authors and Affiliations

  1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, China

    Ziquan Chen, Chuan He, Di Wu, Guowen Xu & Wenbo Yang

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  1. Ziquan Chen
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  2. Chuan He
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  3. Di Wu
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  4. Guowen Xu
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  5. Wenbo Yang
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Correspondence to Ziquan Chen.

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Chen, Z., He, C., Wu, D. et al. Fracture evolution and energy mechanism of deep-buried carbonaceous slate. Acta Geotech. 12, 1243–1260 (2017). https://doi.org/10.1007/s11440-017-0606-5

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  • DOI: https://doi.org/10.1007/s11440-017-0606-5

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