Soil drainage clogging mechanism under vacuum preloading: A review

Zhang, Xudong; Huang, Tianwen; Wu, Yajun

doi:10.1016/j.trgeo.2023.101178

Cited by 16 publications

(4 citation statements)

References 154 publications

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“…The sand used for the test was medium sand, the sand density was 1.457 g/cm 3 , and the sand water content was 8.73%. The specific test method and test results were as follows:…”

Section: Model Testmentioning

confidence: 99%

“…The height of the sand is filled to 0.6 m by layering compaction, and the weight of each barrel of sand and the number of drums used can be measured to determine the quality of the sand used. The sand mass used is about 874 kg, and the size of the foundation soil is l m × 1 m × 0.6 m. This results in a sand density of about 1.457 g/cm 3 .…”

Section: Model Testmentioning

confidence: 99%

“…Furthermore, it is important to consider the impact of water-related disasters, such as floods and tidal actions, on the stability and safety of high-pile foundations. Particularly in riverine and marine environments, variations in water flow intensity and direction can cause soil erosion around the pile foundations, thereby increasing the risk of structural failure [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Yang,

Zhang,

et al. 2024

Water

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High-pile foundation is a common form of deep foundation commonly used in ocean environments, such as docks and bridge sites. Aiming at the problem of bearing capacity of high pile foundations, this paper proposes the calculation of bearing capacity and the analysis of scour depth of high pile foundations under the action of scour based on the modified p-y curve. In this paper, three kinds of scour mechanisms—natural evolution scour, general scour, and local scour—are described; and the calculation methods of scour widely used at present are compared and analyzed. The solution of the vertical stress of soil around the pile under local scour is solved and applied to the β method to solve the lateral resistance of the pile under local scour. The local erosion is equivalent to the whole erosion, and the expression of the ultimate soil resistance before and after the equivalent is calculated, respectively, according to the principle that the ultimate soil resistance at a certain point above the equivalent pile end remains unchanged. The distance from the equivalent soil surface to the pile end can be obtained simultaneously, and then the equivalent erosion depth, p-y curve of sand at different depths, and high pile bearing capacity can be obtained. Finally, it is found that the bending moment of a single pile body varies along the pile body in the form of a parabola, and the maximum bending moment of the pile body is below the mud surface and increases with the increase in horizontal load. When the scouring depth is 30 m, the horizontal load is 25 KN, and the maximum bending moment of the pile body is about 150 N·m. The data with a relative error greater than 10% accounted for only 16.6% of the total data, and the error between the calculated value and the measured value was small. The formula can predict the erosion depth more accurately.

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“…The sand used for the test was medium sand, the sand density was 1.457 g/cm 3 , and the sand water content was 8.73%. The specific test method and test results were as follows:…”

Section: Model Testmentioning

confidence: 99%

Section: Model Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Yang,

Zhang,

et al. 2024

Water

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“…Moreover, the hydraulic conductivity from sensor 3 to sensor 9 in the dry density of 1.9×10 3 kg/m 3 decreased by nearly 2 orders of magnitude, more significantly. In fact, the performance of effective clogging can reduce hydraulic conductivity by 1-2 orders of magnitude in the soil [32], that can significantly block the amount of incoming water, increasing the risk of disasters such as outburst for the accumulation [12,42,43].…”

Section: Experimental Verification Of Graded Distribution Slags Cloggingmentioning

confidence: 99%

Experimental Study on the Clogging Performance of Waste Slag

Li,

Chen,

et al. 2024

Water

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The fine particles around a mining area are easy to transport under the climatic and hydrological actions such as rainfall, that causes the change in the permeability of accumulated slag and increases the hazard probability of slag debris flow. In this study, eight experiments were designed to discuss the influence of fine particle migration on the permeability characteristics and clogging of slag accumulation in different graded particles and different dry densities. The results of experiments with coarse slags of five different particle sizes show that the ratio ranging from four to six in the coarse slag size and fine size caused a significant clogging phenomenon. It is confirmed that the shape of the particles is one of the factors affecting the clogging of coarse soil besides the coarse and fine particle size, and the clogging assessment criterion for slag and the corresponding clogging patterns based on the slag shape characteristics are given. And through three kinds of different dry density-graded slag, three clogging experiments were completed to verify the clogging standard and clogging particle size. The experimental results show that the clogging particle size obtained by the clogging criteria can effectively reduce the permeability of slag accumulation, and it is considered that the equivalent particle size and particle shape characteristics are the main factors affecting the clogging performance of accumulation, while the dry density of deposits has no significant influence on it.

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A Multi‐Zone Axisymmetric Model for Consolidation of Saturated Soils Improved by PVTD With Interfacial Thermal Resistance

Tang,

Wen,

Tian

et al. 2024

Num Anal Meth Geomechanics

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During the process of treating soft soil foundations with prefabricated drainage drains (PVD), “soil columns” form around the PVD, and a “weak zone” forms outside the range of the “soil columns.” The difference in properties between the two forms a distinct interface, leading to a gradual decrease in drainage efficiency and obstruction of vertical drainage channels, which in turn causes cracks and lateral displacement in the soil during consolidation. The interfaces between adjacent soil layers are incomplete contact, and the water within the interstices impedes the transfer of heat, manifesting a thermal resistance effect. To address this phenomenon, a synchronous measurement system for the thermal gradient and the heat flux density between the soil interfaces has been developed. Applying Fourier's law of heat conduction, the thermal resistance coefficient has been determined. Based on the theory of thermo‐hydro‐mechanical coupling, a multi‐zone axisymmetric model for saturated soils that considers thermal resistance effect has been proposed. Semi‐analytical solutions were derived and validated through comparison with the custom FEM model and field experiments. The thermal consolidation characteristics of the multi‐zone soils under various thermal contact models have also been discussed, with a comprehensive analysis of the influence of different parameters. Outcomes show that: the generalized incomplete thermal contact model provides a better description of the thermal resistance phenomenon between multi‐zone soils interfaces; ignoring the thermal resistance effect leads to an overestimation of the deformation during the thermal consolidation, and, the thermal resistance effect decreases the influence of the thermo‐osmosis effect on the consolidation characteristics.

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Soil drainage clogging mechanism under vacuum preloading: A review

Cited by 16 publications

References 154 publications

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Experimental Study on the Clogging Performance of Waste Slag

A Multi‐Zone Axisymmetric Model for Consolidation of Saturated Soils Improved by PVTD With Interfacial Thermal Resistance

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