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Volume 46 Issue 7
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LIANG Xiaomin, GU Xiaoqiang, ZHAI Chongpu, WEI Deheng. Anisotropic wave velocities of granular materials and microscopic fabric using X-ray computed tomography[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(7): 1398-1407. DOI: 10.11779/CJGE20230425
Citation: LIANG Xiaomin, GU Xiaoqiang, ZHAI Chongpu, WEI Deheng. Anisotropic wave velocities of granular materials and microscopic fabric using X-ray computed tomography[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(7): 1398-1407. DOI: 10.11779/CJGE20230425
shu

Anisotropic wave velocities of granular materials and microscopic fabric using X-ray computed tomography

  • 1.

    Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

  • 2.

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China

  • 3.

    Institute of Geomechanics and Underground Technology, RWTH Aachen University, Aachen 52074, Germany

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  • Received Date: May 16, 2023
  • Available Online: November 26, 2023
    Graphical Abstract
    • Abstract
  • The anisotropy of wave velocities of granular materials is investigated from both the macroscopic and microscopic scales. The effects of stress states on the P- and S-wave velocities propagating along multiple directions in granular samples of PVC particles are examined in a cylindrical torsion-shear apparatus with two bender elements. Using the X-ray computed tomography, the fabric evolution of the specimen, including the coordination number, particle orientation and contact normal, during consolidation along different stress paths is analyzed. The results indicate that an initial stiffness anisotropy can be observed that the horizontal stiffness of the specimen is larger than that in the vertical direction, which is related to the long axes of particles. As the ratio of vertical to horizontal stress increases, the wave velocity along the vertical distribution of direction increases, while the horizontal wave velocity remains nearly constant before an obvious decrease. This trend is strongly associated with the variation of coordination number. Moreover, the ratio of vertical to horizontal stress-normalized wave velocity keeps almost unchanged and then gradually approaches to 1.0 as the stress ratio increases, which is related to the evolution of long axes of particles and normal fabric anisotropy of contact.
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    • References (33)
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