Undrained cyclic behavior of under-consolidated soft marine clay with different degrees of consolidation

Zheng, Jinhuo; Hu, Xiuqing; Gao, Shihu; Wu, Lei; Yao, Shengnan; Dai, Ming; Liu, Zhiming; Wang, Jun

doi:10.1080/1064119x.2022.2158766

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…Figure illustrates the deviator stress ( q = σ 1 ′ – σ 3 ′ ) dependence on the axial strain for hydrate-bearing and hydrate-free sediments with the different degrees of consolidation U (the degree of consolidation can be measured by pore pressure and increases significantly with depth , ) and the initial effective confining stress before shearing σ bs . The increase of σ bs and degree of consolidation would lead to the increase of deviator stress.…”

Section: Test Resultsmentioning

confidence: 99%

Mechanical Characteristics of Underconsolidated Methane Hydrate-Bearing Clayed-Silty Sediments

Liu

Chen

et al. 2023

Energy Fuels

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Natural gas hydrate reserves in the South China Sea are huge, and their commercial prospects have been proved by repeated trial production. It is essential to systematically clarify the mechanical properties of hydrate-bearing sediments for the safe drilling of hydrate reservoirs. To date, most research studies focus on the undrained mechanical behavior of hydrate-bearing sandy or clayed sediments under normal consolidation conditions, but there are few reports on underconsolidated-undrained triaxial shear experiments. In this study, the present research conducts undrained triaxial shear tests on hydrate-bearing clayed-silty sediments. The results show that underconsolidated hydrate-bearing sediments appear to show a strain-hardening phenomenon, which are different from hydratebearing sands in Nankai Trough. The excess pore water pressure of hydrate-bearing sediments remains positive during shear. The increasing degree of consolidation will increase the failure strength and the Secant Young's modulus E 50 . According to the Mohr− Coulomb criterion, the corresponding predicting formulas are established, and the cohesion increases with the increase in the degree of consolidation, while the internal friction angle is not sensitive to the degree of consolidation. In addition, the failure strength and the Secant Young's modulus E 50 increase with the increase in initial effective confining stress before shearing.

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Section: Test Resultsmentioning

confidence: 99%

Mechanical Characteristics of Underconsolidated Methane Hydrate-Bearing Clayed-Silty Sediments

Liu

Chen

et al. 2023

Energy Fuels

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“…Geotechnical in situ tests have become an effective method for determining geotechnical design parameters [14,15]. Nevertheless, due to the limited permeability of soft marine clay, the foundation treatment only results in the formation of a solid soil layer on top, while the underlying layer of soft marine clay remains incompletely consolidated, referred to as an underconsolidated condition [1,[6][7][8][9][10][11][12][13]. During the consolidation of a compressible foundation layer under consolidation, residual excess pore water pressures are present, which result from previous loads or self-weight.…”

Section: Introductionmentioning

confidence: 99%

Influence of Penetration Rate on Full-Flow Penetrometer Resistance in Underconsolidated Clay

Qiao,

Liu,

Zhou

et al. 2024

JMSE

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In the past few years, offshore site investigations have extensively utilized full-flow penetrometers like the Ball and T-bar penetrometers to assess penetration resistance and subsequently analyze the strength characteristics of marine clay. The relationship between penetration rate and the measured resistance to penetration and shear strength in clays has been extensively documented through full-flow penetration tests. Although previous studies have shown empirical correlations between undrained shear strength and penetration resistance, the resistance factor utilized in these correlations is typically suggested for cohesive soils that are overconsolidated or normally consolidated, rather than underconsolidated soils. The effects of penetration rate undrained penetration resistances in underconsolidated marine clay are investigated in this study by considering the outcomes of variable rate penetration testing and twitch penetration testing using full-flow penetrometers in laboratory model tests. The discussion focuses on penetration resistances depending on the normalized velocity of the full-flow penetrometers (Ball and T-bar).

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Effect of soil consolidation on the interface direct shear behavior of excavated clay soil reinforced with a geocomposite drainage layer

Wang,

Hu,

Qian

et al. 2024

Bull Eng Geol Environ

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Undrained cyclic behavior of under-consolidated soft marine clay with different degrees of consolidation

Cited by 6 publications

References 24 publications

Mechanical Characteristics of Underconsolidated Methane Hydrate-Bearing Clayed-Silty Sediments

Mechanical Characteristics of Underconsolidated Methane Hydrate-Bearing Clayed-Silty Sediments

Influence of Penetration Rate on Full-Flow Penetrometer Resistance in Underconsolidated Clay

Effect of soil consolidation on the interface direct shear behavior of excavated clay soil reinforced with a geocomposite drainage layer

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