Nonlinear consolidation of soft foundation improved by prefabricated vertical drains based on elliptical cylindrical equivalent model

Self Cite

In this paper, the one‐dimensional rheological characteristics of multilayered saturated porous rock subjected to a ramp‐type heating is investigated. By introducing the fractional order parameter and material parameters, a viscoelastic constitutive model is proposed to describe the rheological characteristics of multilayered saturated porous rock. The general incomplete thermal contact model is established to predict the interfacial thermal contact resistance of multilayered saturated porous rock. Based on the coupled thermo‐hydro‐mechanical theory, the semi‐analytical solutions of the excess pore water pressure, temperature increment and displacement are obtained by using the Laplace transform method. The accuracy of the present solutions is verified by comparing with the classic elastic and viscoelastic models, and existing solutions. In addition, the influence of fractional order parameter, material parameter ratio, thermal contact transfer coefficient and thermal partition coefficient on the excess pore water pressure, temperature increment and displacement of multilayered saturated porous rock are investigated.

Section: Introductionmentioning

confidence: 99%

Fractional derivative modelling for rheological characteristics of multilayered saturated porous rock with interfacial thermal contact resistance

Wen

et al. 2023

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“…Subsequently, the consolidation theory has been developed by considering the well resistance, band-shaped PVD, nonlinear stress-strain relationship, vacuum preloading, vertical flow, layered soil, partially penetrating vertical drains, and other factors. [12][13][14][15][16][17][18][19][20] To replicate the realistic geometry of PVD in the consolidation model, an elliptical cylindrical equivalent model was devised by Huang et al 19 In previous studies, 21,22 the elliptical cylindrical equivalent model has been proved to be a generalized consolidation model since it could readily be converted into the typical circular cylindrical equivalent model. Also, previous studies have validated the equivalent elliptical cylindrical model by comparing it to other equivalent models and a large number of measured data.…”

Section: Introductionmentioning

confidence: 99%

Large‐strain consolidation of PVD‐improved soils considering depth‐dependent initial void ratio and initial effective stress due to soil self‐weight

Tian,

Wu,

Wang

et al. 2023

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A governing equation for large‐strain consolidation of PVD‐improved soil is developed based on the equivalent elliptical cylindrical model, which accounts for depth‐dependent initial void ratio and initial effective stress induced by soil self‐weight, well resistance with variable discharge capacity, time‐dependent load, and nonlinear variations of compressibility and permeability. Then, a numerical solution is obtained by means of COMSOL Multiphysics and is validated through comparisons with existing solutions and measured data. The parametric studies show that the difference between large‐strain consolidation and small‐strain consolidation reduces with the decreases of the compression index and applied load. Although the soil self‐weight has little effect on the degree of consolidation in some cases, the soil settlement will be significantly overestimated if the self‐weight is ignored. The development of consolidation slowed as the ratio of compressibility over horizontal permeability increased.

“…The variance of temperature field has a great influence on the surrounding rock and soil medium, which is reflected by the change of its physical and mechanical properties. [1][2][3][4] With more engineering problems being reported, such as geothermal energy extraction and storage, 5,6 radioactive waste disposal, 7 deep drilling and excavation, 8 energy piles, [9][10][11][12] ground improvement using prefabricated vertical thermal drains, [13][14][15] research on the thermo-hydro-mechanical (THM) coupling process has received increasing attention. Among them, thermal consolidation of saturated media is one of the most widely researched and yet not fully understood aspects in the field of geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

“… show the influence of thermo-osmotic coefficient S w on the development of pore water pressure and displacement for different contact models. FromFigures 11,13,15, and 17, it is found that all the excess pore water pressures calcaulated by the four models decrease sharply as the thermo-osmotic coefficient decreases. It is also found that the maximum excess pore water pressures obtained by the perfect contact model for different thermo-osmotic coeffecients are at the interface, but those obtained by the other three models are in the first layer.…”

mentioning

confidence: 96%

A general interfacial thermal contact model for consolidation of bilayered saturated soils considering thermo‐osmosis effect

Wen

Tian

et al. 2022

Self Cite

In this paper, a general interfacial thermal contact model is proposed to investigate the heat conduction characteristics at the interface of bilayered saturated soils. The semianalytical solutions of thermal consolidation of the bilayered saturated soils considering thermo-osmosis effect under ramp-type heating are derived by using the Laplace transform. Then, the expressions of the temperature increment, excess pore water pressure, and displacement are obtained in time domain by using the Crump's method. Comparisons are performed to verify the rationality of the obtained solutions, and the influences of contact transfer coefficient, partition coefficient, and the thermo-osmosis coefficient on the thermal consolidation of the bilayered saturated soil are illustrated and discussed. Neglecting the thermal contact resistance would overestimate the thermal consolidation behavior of the bilayered saturated soils. The calculated excess pore water pressure and displacement considering thermo-osmosis effect are much larger than those without thermo-osmosis effect.