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  • 全国中文核心期刊
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XIAO Xing, JI Dongwei, WU Qi, LI Yuanxi, CHEN Guoxing. Experimental investigation on cyclic failure criteria for marine clay based on energy method[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2361-2370. DOI: 10.11779/CJGE20230730
Citation: XIAO Xing, JI Dongwei, WU Qi, LI Yuanxi, CHEN Guoxing. Experimental investigation on cyclic failure criteria for marine clay based on energy method[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2361-2370. DOI: 10.11779/CJGE20230730

Experimental investigation on cyclic failure criteria for marine clay based on energy method

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  • Received Date: July 31, 2023
  • Available Online: May 10, 2024
  • The reasonable determination of the cyclic strength of marine clay is critical for ensuring the stability of marine structures throughout their service life. In order to study the cyclic failure criteria for the marine clay, a series of constant-volume cyclic direct simple shear tests are performed on the undisturbed saturated marine clay in the Yangtze River Estuary with different plasticity indexes (IP) under different cyclic stress ratios (CSRs). The cyclic responses of the marine clay specimens are presented. The cyclic failure criteria are investigated by employing the energy method. The results indicate that there is a threshold cyclic stress ratio (CSRth) in the undisturbed marine clay. When the CSR is smaller than the CSRth, the energy dissipation per cycle (Wi) develops linearly only within a limited range that does not contribute to the cyclic failure of marine clay. However, when the CSR exceeds the CSRth, the development curve of Wi with the number of cycles (N) shows an inflection point due to the serious damage of the soil structures. This point serves as the critical point for cyclic failure to determine the number of cycles to failure (Nf) and the double-amplitude shear strain to failure (γDA,f). The CSRth of the marine clay in the Yangtze River Estuary exhibits a power function relationship with the increasing IP. Additionally, with the increasing CSR and IP, both Wi and γDA,f tend to increase, while the Nf gradually decreases. Furthermore, the data points of γDA,f/IP1.5 ~ CSR-CSRth for all the tests are distributed in a narrow band, and a virtually positive linear relationship exists between the γDA,f/IP1.5and CSR-CSRth. Finally, a γDA,f evaluation method applicable to the marine clay in different seas is proposed for practical geotechnical engineering.
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