Comparative study on the liquefaction properties of seabed silt under wave loading in the Huanghe River Delta

Song Yupeng; Sun Yongfu; Song Binghui; Dong Lifeng; Du Xing

doi:10.12284/hyxb2021100

Volume 43 Issue 6

Jun. 2021

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Song Yupeng，Sun Yongfu，Song Binghui, et al. Comparative study on the liquefaction properties of seabed silt under wave loading in the Huanghe River Delta[J]. Haiyang Xuebao，2021, 43(6)：129–138 doi: 10.12284/hyxb2021100

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Comparative study on the liquefaction properties of seabed silt under wave loading in the Huanghe River Delta

doi: 10.12284/hyxb2021100

Song Yupeng^{1, 3
,},
Sun Yongfu^{2, 3
,
,},
Song Binghui¹,
Dong Lifeng¹,
Du Xing¹

1.
Marine Engineering Environment Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
National Deep Sea Center, Qingdao 266237, China
3.
Laboratory for Marine Geology and Environment, Pilot National Oceanography Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2020-06-18
Rev Recd Date: 2020-10-19

Available Online: 2021-04-02

Publish Date: 2021-06-30

Abstract

Abstract

As a common submarine geological disaster, wave-induced seabed liquefaction seriously threatens the safety of subsea engineering facilities in the Huanghe River Delta. The structure, physical and mechanical properties of seabed soil after wave-induced liquefaction all have changed, so it has important theoretical significance and practical value to study on the evaluation of potential possibility of re-liquefaction of seabed soil after previous liquefaction. In this paper, a series of cyclic triaxial liquefaction tests were conducted on core samples collected from submarine non-liquefied and liquefied zone in the Huanghe River Delta, respectively. The differences between non-liquefied and liquefied seabed soil in the developing trends of pore pressure and axial dynamic strain with cycles were analyzed and discussed, and the corresponding liquefaction potentials were also comparatively evaluated. The test results show that compared to pore pressure, the strain standard is more suitable to evaluate the liquefaction potential of the seabed silt in the Huanghe River Delta. The pore pressure and dynamic axial strain development characteristics indicate that the re-liquefaction resistance of the liquefied seabed silt is improved to some extent compared with the non-liquefied silt. Furthermore, the correlations between the normalized pore pressure ratio u_d/σ₃ and the normalized cycle ratio N/N_f could be described quantitatively by the hyperbolic or exponential functions for liquefied and non-liquefied seabed silts. Finally, the critical cyclic stress ratio for the non-liquefied seabed silt is around 0.20 compared to 0.35 for the liquefied one in the Huanghe River Delta. The research findings will contribute to deepening the understanding of the wave-induced liquefaction mechanism of seabed silt, and also provide an example reference for the study of the mechanical properties of soil subjected to previous cyclic stress history.
- Huanghe River Delta,
- seabed silt,
- re-liquefaction,
- cyclic triaxial test

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