The seepage study of transient caisson pull-out in sand

Moghaddam, F. Khazaeli; Imam, Reza

doi:10.1016/j.oceaneng.2022.111804

Cited by 3 publications

(2 citation statements)

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“…The calculation of Based on Equation (1), the average hydraulic gradient along the drainage path can be defined as: i ave = p/(γ w s ave ). The caisson pullout velocity may be given roughly as: v = k•i ave according to Darcy's law [17]. Therefore, the differential pressure beneath the lid can be expressed by…”

Section: Effect Of Normalized Pullout Velocitymentioning

confidence: 99%

“…The obvious permeability of sand results in a significant seepage field in soil domain [11], which has a prominent influence on the development of differential pressure. Pore pressure was a simulated transmission in numerical simulation by adding a thin layer of "water elements" between caisson lid and soil [12][13][14][15][16][17]. Vaitkunaite [18] conducted a series of large-scale model tests to study the development of differential pressure under axial loading.…”

Section: Introductionmentioning

confidence: 99%

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Calculation Method for Uplift Capacity of Suction Caisson in Sand Considering Different Drainage Conditions

Xu¹,

Jiang²,

et al. 2022

Sustainability

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Uplift capacity of suction caissons is one of the main concerns in the design of jackets with multi-caissons supported offshore wind turbine. The uplift movement of suction caissons leads to soil stress variation and increases the difficulty to predict the uplift capacity. In this paper, a calculation method considering soil stress release and differential pressure contribution is proposed to predict the uplift capacity of caisson. Firstly, a series of numerical simulations based on the SANISAND model are conducted to study the uplift responses of suction caisson in sand, and it is verified with centrifuge test results. Considering the soil drainage condition during caisson being pulled out, the fully drained, partially drained and undrained are divided, and an equation is provided to assess differential pressure beneath the caisson lid incorporating the effects of main factors. Based on the above simulation results, a calculation method is proposed to calculate the uplift capacity of caissons. The prediction results are compared with the centrifuge model tests and previous studies, which indicate that the prediction accuracy is much improved. This proposed method contributes to the more accurate assessment of uplift capacity of suction caisson in sand.

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Section: Effect Of Normalized Pullout Velocitymentioning

confidence: 99%