Experimental study of pullout capacity of plate anchors shallowly embedded in hydrate bearing sediments

Liu, Fang; Sun, Haoyu; Jung, Jongwon; Zhang, Xuhui; Ju, Xiaoli

doi:10.1016/j.oceaneng.2019.01.014

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…(S u /p 0 ) OC S u /p 0 = OCR Λ (10) where parameter Λ relates to changes in the e of specimens during overconsolidation, which is equal to (λ − κ)/λ. In this study, Λ is calculated to be 0.83 according to λ = 0.175 and κ = 0.029, as shown in Figure 3.…”

Section: Effects Of Ocr On S U /Pmentioning

confidence: 99%

“…The sediments within the installed piles or anchors are normally considered to be remolded and would reconsolidate with time after installation [8]. Since it is well known that changes in porosities due to consolidation obviously affects the shear strength of unconsolidated sediments [9], the resultant changes in undrained shear strength (hereafter S u ) are required to access the stability of suction piles for various submarine engineering projects [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea

et al. 2023

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Suction piles are used to ensure wellhead stability during natural gas hydrate production in the Shenhu area of the South China Sea (SCS). Undrained shear properties of clayey-silty sediments play a critical role in the stability analysis of suction piles. However, it has not been fully studied. This study conducts a series of undrained triaxial shear tests on shallow clayey-silty sediments in the Shenhu area of SCS, and stress–strain curves under different overconsolidation ratio (OCR) conditions are obtained. OCR effects on undrained shear properties of clayey-silty sediments are discussed, and a model to predict the pore pressure coefficient at failure is proposed. Results show that the isotropic compression index is 0.175, and the isotropic swelling index is 0.029. The undrained shear strength is proportional to the effective confining pressure, and the proportionality coefficient is 0.42 for normally consolidated specimens, while the undrained shear strength of OC specimens nonlinearly increases with OCRs increasing. The proposed model aptly predicts the pore pressure coefficient at the failure of clayey-silty sediments of SCS with different OCRs.

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Section: Effects Of Ocr On S U /Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea

et al. 2023

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“…In experimental study, Ilamparuthi et al 9 investigated the uplift behavior of circular anchors in loose, medium-dense and dense dry sand, the difference in the uplift behaviors of shallow and deep buried anchors was observed, and the anchor diameter, embedment ratio, and sand density significantly influenced the uplift capacity. Giampa et al 10 analyzed the effect of anchor shapes (circular, square, triangular, and kite) on the uplift behavior of shallow horizontal anchor plates through 1G physical model tests, and the results indicated that the circular anchor had the highest pullout capacity, whereas the square anchor had the lowest. Moreover, the uplift bearing characteristics of rectangular anchors in the ocean were investigated by Liu et al 11 through small-scale model tests, the effect of hydrates on the uplift capacity was evaluated, and the results indicated that hydrate dissociation adversely affected the pullout capacity of the anchors.…”

Section: Introductionmentioning

confidence: 99%

“…investigated the uplift behavior of circular anchors in loose, medium‐dense and dense dry sand, the difference in the uplift behaviors of shallow and deep buried anchors was observed, and the anchor diameter, embedment ratio, and sand density significantly influenced the uplift capacity. Giampa et al 10 . analyzed the effect of anchor shapes (circular, square, triangular, and kite) on the uplift behavior of shallow horizontal anchor plates through 1G physical model tests, and the results indicated that the circular anchor had the highest pullout capacity, whereas the square anchor had the lowest.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional upper‐bound limit analysis of ultimate pullout capacity of anchor plates using variation method

Zhao

Tan

et al. 2022

Num Anal Meth Geomechanics

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The uplift bearing capacity of anchor plates has been the focus of geotechnical engineering research. In this study, based on the upper-bound limit analysis theory and considering the nonlinear characteristics of geomaterials, the three-dimensional uplift behavior of a shallow horizontal anchor plate was analyzed. Based on the variational principle, virtual power principle, and equilibrium equation, the ultimate pullout forces of rectangular and circular anchor plates were derived, and the dimensionless breakout factor and failure mechanism of the overlying soil were obtained. The ultimate pullout forces were in good agreement with the existing research results, and the principal stresses along the rupture surface agreed well with that obtained by numerical analysis, which could demonstrate the effectiveness and accuracy of the proposed method. Moreover, the effects of the nonlinear coefficient, anchor size and aspect, embedment ratio, and surface overload on the breakout factor were investigated. Meanwhile, the shape modification factors of rectangular and circular anchor plates were obtained. The findings of this study can provide a useful reference for anchor plate design.

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Effects of Heterogeneity and Nonlinearity on Uplift Characteristics of Shallow Horizontal Anchor Plates

Zhao

Gong

et al. 2022

Geotech Geol Eng

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Experimental study of pullout capacity of plate anchors shallowly embedded in hydrate bearing sediments

Cited by 8 publications

References 42 publications

Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea

Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea

Three‐dimensional upper‐bound limit analysis of ultimate pullout capacity of anchor plates using variation method

Effects of Heterogeneity and Nonlinearity on Uplift Characteristics of Shallow Horizontal Anchor Plates

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