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Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks

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  • Jun Peng

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
    State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China)

  • Sheng-Qi Yang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China)

Abstract

High temperature treatment has a significant influence on the mechanical behavior and the associated microcracking characteristic of rocks. A good understanding of the thermal damage effects on rock behavior is helpful for design and stability evaluation of engineering structures in the geothermal field. This paper studies the mechanical behavior and the acoustic emission (AE) characteristic of three typical rocks (i.e., sedimentary, metamorphic, and igneous), with an emphasis on how the difference in rock type (i.e., porosity and mineralogical composition) affects the rock behavior in response to thermal damage. Compression tests are carried out on rock specimens which are thermally damaged and AE monitoring is conducted during the compression tests. The mechanical properties including P-wave velocity, compressive strength, and Young’s modulus for the three rocks are found to generally show a decreasing trend as the temperature applied to the rock increases. However, these mechanical properties for quartz sandstone first increase to a certain extent and then decrease as the treatment temperature increases, which is mainly attributed to the high porosity of quartz sandstone. The results obtained from stress–strain curve, failure mode, and AE characteristic also show that the failure of quartz-rich rock (i.e., quartz sandstone and granite) is more brittle when compared with that of calcite-rich rock (i.e., marble). However, the ductility is enhanced to some extent as the treatment temperature increases for all the three examined rocks. Due to high brittleness of quartz sandstone and granite, more AE activities can be detected during loading and the recorded AE activities mostly accumulate when the stress approaches the peak strength, which is quite different from the results of marble.

Suggested Citation

  • Jun Peng & Sheng-Qi Yang, 2018. "Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks," Energies, MDPI, vol. 11(9), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2350-:d:168100
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    References listed on IDEAS

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    1. Tiskatine, R. & Eddemani, A. & Gourdo, L. & Abnay, B. & Ihlal, A. & Aharoune, A. & Bouirden, L., 2016. "Experimental evaluation of thermo-mechanical performances of candidate rocks for use in high temperature thermal storage," Applied Energy, Elsevier, vol. 171(C), pages 243-255.
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    Cited by:

    1. Peng Xiao & Jun Zheng & Bin Dou & Hong Tian & Guodong Cui & Muhammad Kashif, 2021. "Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates," Energies, MDPI, vol. 14(13), pages 1-17, June.
    2. Lingyun Kong & Mehdi Ostadhassan & Siavash Zamiran & Bo Liu & Chunxiao Li & Gennaro G. Marino, 2019. "Geomechanical Upscaling Methods: Comparison and Verification via 3D Printing," Energies, MDPI, vol. 12(3), pages 1-20, January.

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