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Volume 45 Issue 11
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YANG Shengqi, HONG Wangxing, SUN Bowen, TANG Xuhai. Experimental study on triaxial mechanics and failure characteristics of shale in different brine environments[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(11): 2217-2226. DOI: 10.11779/CJGE20220829
Citation: YANG Shengqi, HONG Wangxing, SUN Bowen, TANG Xuhai. Experimental study on triaxial mechanics and failure characteristics of shale in different brine environments[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(11): 2217-2226. DOI: 10.11779/CJGE20220829
shu

Experimental study on triaxial mechanics and failure characteristics of shale in different brine environments

  • 1.

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

  • 2.

    School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 21116, China

  • 3.

    School of Civil Engineering, Wuhan University, Wuhan 430072, China

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  • Received Date: July 02, 2022
  • Available Online: March 05, 2023
    Graphical Abstract
    • Abstract
  • Shale is an ideal caprock for carbon dioxide sequestration projects in deep saline aquifers. Different brine solutions and confining pressures have a significant effect on the mechanical behaviors of caprock shale, which also affects the safety and stability of carbon dioxide geological storage projects in deep saline aquifers. Therefore, the conventional triaxial compression tests are carried out on the shale specimens saturated with different brine solutions, and their mechanical parameters and failure characteristics are analyzed. Compared with those of the dry specimens, the peak strength and elastic modulus of the specimens saturated with different brine solutions all show a downward trend to different degrees under different confining pressures; and the shale specimens saturated with 5% NaCl solution have the most obvious deterioration effects on the mechanical parameters, followed by the shale specimens saturated with 5% K2SO4 solution. The failure modes of the shale specimens saturated with different solutions show more secondary cracks, which are mainly along the bedding direction. By conducting microscopic tests to further analyze the failure characteristics of the specimens, it is found that the main reason for the deterioration of the macro-mechanical properties of the shale saturated with brine solution is that the brine solution intrudes into the shale through the bedding plane and dissolves and erodes the minerals in the bedding plane. Finally, based on the energy evolution laws in the whole process of shale stress-strain curve, the brittleness evaluation of the shale specimens saturated with different brine solutions is carried out. It is found that the brittleness index of the shale specimens saturated with brine solution decreases significantly and is sensitive to the confining pressure.
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    • References (25)
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