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Volume 46 Issue 9
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WANG Luyang, WU Qi, ZHOU Zhenglong, ZHANG Xinlei, WANG Binghui, CHEN Guoxing. Experimental study on development patterns of volumetric strain and predictive modeling for saturated coral sands[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(9): 1965-1973. DOI: 10.11779/CJGE20230522
Citation: WANG Luyang, WU Qi, ZHOU Zhenglong, ZHANG Xinlei, WANG Binghui, CHEN Guoxing. Experimental study on development patterns of volumetric strain and predictive modeling for saturated coral sands[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(9): 1965-1973. DOI: 10.11779/CJGE20230522
shu

Experimental study on development patterns of volumetric strain and predictive modeling for saturated coral sands

  • 1.

    Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China

  • 2.

    Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China

  • 3.

    School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China

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  • Received Date: June 07, 2023
  • Available Online: March 24, 2024
    Graphical Abstract
    • Abstract
  • The coral sand has better drainage conditions, and the drainage deformation of the saturated coral sand under earthquake and wave loads can easily cause damage to the seabed and nearby structures. Focusing on the properties of the saturated coral sand and by investigating the effects of fines content FC, relative density Dr and cyclic stress ratio CSR on its deformation characteristics, a series of cyclic drainage loading tests are carried out on the specimens of Nansha islands using the GDS dynamic triaxial instrument. The test results show that the development rate and the degree of deformation of cumulative volumetric strain εvp of the coral sand increase with the increase of FC and CSR, and decrease with the increase of Dr. The εvp-N relationship curve of the saturated coral sand shows two development modes, cyclic smoothness and cyclic creep. The potential damage factor DP is introduced to characterize the influences of FC on the development pattern of εvp, and a DP×CSR-Dr framework is established to evaluate the development patterns of its volumetric strain. To characterize the effects of FC and Dr on its εvp-N relationship curve, the equivalent skeleton void ratio esk* is introduced, and it is found that there is a good correlation between εvp-s and esk* under both development modes, thus, a model for the development of volumetric strain in the saturated coral sand under drainage cyclic loading conditions is established, which can well predict the development patterns of volumetric strain in the saturated coral sand.
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    • References (26)
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