Buoyancy Reduction Coefficients for Underground Silos in Sand and Clay

Zhang, Qingzhang; Ouyang, Liuzhang; Wang, Zhenqing; Liu, Haiyan; Zhang, Yongbing

doi:10.1007/s40098-018-0316-4

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…The buoyancy acting on the structure varies depending on the type of the soil (clay or sand). It is proved that the buoyancy of a structure in saturated sand is almost equal to the calculated value of Archimedes' law [1,2]. When liquefaction occurs, the buoyancy is much greater than that in hydrostatic state [3][4][5].…”

Section: Introductionmentioning

confidence: 84%

Field Test on Buoyancy Variation of a Subsea Bottom-Supported Foundation Model

Fang

Liu²,

et al. 2019

JMSE

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The bottom-supported foundation is the most important component of offshore platforms, as it provides the major support to the upper structure. The buoyancy of the bottom-supported foundation is a critical issue in platform design because it counteracts parts of the vertical loads. In this paper, a model box was designed and installed with earth pressure transducers and pore pressure transducers to simulate the sitting process of the bottom-supported foundation. The buoyancy acting on the model box was calculated on the basis of two different methods, i.e., the water pressure difference between top and bottom surface and the effective stress at the bottom of the model. Field tests with different sitting times were carried out on the saturated soft clay seabed. Numerical coupled analysis was performed to verify the dissipation of the excess pore pressure at the bottom of the model. The results showed that the buoyancy of the model could reach twice the calculated value of Archimedes’ law in the initial stage, however, it eventually stabilized near the theoretical value as the excess pore pressure dissipated. There was a slight fluctuation in buoyancy due to the phase lag of the pore pressure response caused by the low permeability of the seabed.

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Section: Introductionmentioning

confidence: 84%

Field Test on Buoyancy Variation of a Subsea Bottom-Supported Foundation Model

Fang

Liu²,

et al. 2019

JMSE

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“…They found that the measured buoyancy of clay soil foundations is less than the theoretical buoyancy, but the test setup did not account for lateral friction in the underground structure. Zhang et al [ 13 ] studied the water buoyancy effect and buoyancy reduction coefficient of an underground grain silo in sandy and clay soil. Considering only the hydrostatic effect, the buoyancy reduction coefficient was 0.95 in the sandy layer and 0.79 in the saturated silty clay.…”

Section: Introductionmentioning

confidence: 99%

Buoyancy of underground structures and pore water pressure conduction law in silty clay strata

Guo,

Zhou,

Sun

et al. 2024

Heliyon

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“…Tey are generally exposed to high buoyancy forces, which may uplift the underground structure. Terefore, the reasonable antifoating design of the underground structure is one of the most important projects in these areas [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…At present, the most commonly used method for the calculation of the buoyancy acting on the structure is based on the classical Archimedes' principle and a further reduction is generally given when considering the soil properties [9,10]. Terefore, a reasonable prediction of the underground water level is the premise of the accurate buoyancy calculation.…”

Section: Introductionmentioning

confidence: 99%

Impact of Seepage on the Underground Water Level in a Complex Soil‐Water‐Structure System

Li¹,

Cao³

2022

Advances in Civil Engineering

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The antifloating design of underground structures is very important in areas with high underground water levels, and reasonable evaluation of the buoyancy is based on accurately describing the distribution of the groundwater level. However, the natural groundwater flow would be disturbed by the structure, which is not considered in the antifloating design. In the present paper, the influence of the width of an underground structure on the groundwater level in homogeneous soil is investigated through an indoor physical model test in the first place, which serves as a benchmark for the numerical simulation. Then, the parametrical study is carried out with numerical simulation. The results show that the width of the structure has the greatest influence on the water level around the structure, followed by the influence of the insertion depth, whereas the length has little influence. The hydraulic gradient has a significant effect on that as well. Moreover, the hydraulic conductivity ratio between different soil layers also affects the water level magnitude. Based on the results, a prediction method for the groundwater level around the structure for both homogeneous soil and multilayer soil has been developed and evaluated.

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Buoyancy Reduction Coefficients for Underground Silos in Sand and Clay

Cited by 15 publications

References 6 publications

Field Test on Buoyancy Variation of a Subsea Bottom-Supported Foundation Model

Field Test on Buoyancy Variation of a Subsea Bottom-Supported Foundation Model

Buoyancy of underground structures and pore water pressure conduction law in silty clay strata

Impact of Seepage on the Underground Water Level in a Complex Soil‐Water‐Structure System

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