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Volume 46 Issue 2
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ZHANG Xinrui, KONG Gangqiang, YANG Qing. Influences of temperature stress path on strength characteristics of undisturbed marine sediments[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 357-365. DOI: 10.11779/CJGE20221308
Citation: ZHANG Xinrui, KONG Gangqiang, YANG Qing. Influences of temperature stress path on strength characteristics of undisturbed marine sediments[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 357-365. DOI: 10.11779/CJGE20221308
shu

Influences of temperature stress path on strength characteristics of undisturbed marine sediments

  • 1.

    Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China

  • 2.

    State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

  • 3.

    School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

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  • Received Date: October 23, 2022
  • Available Online: April 05, 2023
    Graphical Abstract
    • Abstract
  • The difference between the room and the in-situ temperatures leads to that of the measured physical and mechanical parameters of marine sediments. Based on the temperature-controlled triaxial apparatus, the consolidated undrained shear tests are carried out on the undisturbed marine sediments from the South China Sea. The changes of deformation, strength, pore pressure and modulus of the marine sediments are measured, and the influences of temperature, temperature cycle, confining pressure and over-consolidation ratio (OCR) on the mechanical properties of the undisturbed marine sediments are discussed. The results show that the increase of the temperature gradient increases the degree of thermal consolidation of the normally consolidated marine sediments, and the corresponding drainage volume and strength also increase. The temperature increases the drainage volume of the over-consolidated marine sediments, while the temperature decreases the strength of the marine sediments. The temperature cycle can enhance the drainage volume of the over-consolidated marine sediments, and its corresponding strength also increases. When OCR=1, the measured undrained shear strength of marine sediments at 25℃ is 8.0% higher than that at 5℃. When OCR=4, the measured undrained shear strength of marine sediments at 25℃ is 1.9% lower than that at 5℃. The shear strength after the temperature cycle of 5℃—45℃—5℃ is 11.9% higher than that at 5℃. After 4 or 10 temperature cycles, the shear strength increases by 13.8% and 17.8%, respectively.
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    • References (19)
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