Equal Strain Consolidation by Vertical Drains

Leo, Chin Jian

doi:10.1061/(asce)1090-0241(2004)130:3(316)

Cited by 79 publications

(47 citation statements)

References 3 publications

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“…Recently, new fully coupled solutions have been developed [15]. This allows including the effect of the smear zone and the well resistance around drains in a more refined way because the uncoupling is not strictly valid under these conditions.…”

Section: Consolidation Analysesmentioning

confidence: 99%

Consolidation around stone columns. Influence of column deformation

Castro

Sagaseta

2008

Num Anal Meth Geomechanics

131

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SUMMARYA solution is presented for the radial consolidation around stone columns under constant surcharge load. The solution considers the influence of vertical and radial deformation of the column, either in elastic and elastoplastic regimes.The solution is in terms of the average excess pore pressure in the soil. It is based on previous solutions, initially developed for rigid column, or including only vertical deformation. For elastic column, the solution gives the variation of strains and stresses between the undrained and final states, for which it coincides with the existing elastic solutions.All the results are given in closed form, and both the elastic and plastic deformations of the column lead to an equivalent coefficient of consolidation for the radial flow, which enables the application of the existing methods of integration of the consolidation equation.A parametric study is presented, showing the influence of the main problem features. A design example is used to illustrate the application to practical cases.

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Section: Consolidation Analysesmentioning

confidence: 99%

Consolidation around stone columns. Influence of column deformation

Castro

Sagaseta

2008

Num Anal Meth Geomechanics

131

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“…(10) is a high-order non-homogeneous linear partial differential equation, so no existing method can be used directly to solve it. However, as suggested by various studies (Lei et al 2015;Leo 2004;Lu et al 2010;Tang and Onitsuka 1998), the mean excess pore water pressure at a given depth of unit cell can be expressed using a Fourier series expansion, such as…”

Section: Mathematical Solution For 'No Clogging' and 'Clogging'mentioning

confidence: 99%

Experimental simulation and mathematical modelling of clogging in stone column

2018

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In this paper, time-dependent clogging is studied considering a unit cell consisting of a single stone column interacting with the surrounding soft clay. Clogging is assessed quantitatively and the corresponding void space of the column is determined using computed tomography. It is observed that the extent of clogging is substantial in the upper part of the column, but diminishes rapidly with depth. The soil properties in the clogged zone are determined indirectly through additional tests of clay–aggregates mixtures with various clay fractions. An equal strain consolidation model based on the principle of unit cell analysis is developed to capture both the initial and time-dependent clogging. The model accounts for a reduction in permeability and an increase in compressibility of the column. This current model, as expected, offers identical results to some previous studies if clogging is ignored, while the comparison with other selected models demonstrates the influence that clogging of the stone column can have on the consolidation of the surrounding soil. Furthermore, load–settlement predictions from the proposed “equal strain” model are also compared with the consolidation response of a previously developed “free strain” model.

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“…Leo (2004) has stated, '' Barron (1948) developed solutions for two limiting cases of consolidation by vertical drains-free strain and equal strain consolidation. Barron's approach was to decouple radial and vertical drainage in the undisturbed soil mass.…”

Section: Introductionmentioning

confidence: 99%

Principle of Super Position of Rate of Settlement in 2D and 3D Consolidations

Tewatia

2015

Geotech Geol Eng

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A principle of super position of rate of settlement for two and three dimensional consolidations is introduced. Using this principle, equations for two and three dimensional consolidations are derived in simple and short manner. They are compared with the existing equations of (3D) consolidation. It is shown that they are same. In literature 3D consolidation equation exists in polar co-ordinates only that means for radial and vertical consolidation. New equations are derived for 2D and 3D consolidation in Cartesian co-ordinates. A method of 3D consolidation is proposed when the time or settlement at the instant of load-increment are not known. The method is applicable in step as well as (uniform and nonuniform) ramp loading. A method is suggested to obtain the time-compression data of radial and 3D consolidation when only the vertical consolidation test is conducted and vice versa.

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Equal Strain Consolidation by Vertical Drains

Cited by 79 publications

References 3 publications

Consolidation around stone columns. Influence of column deformation

Consolidation around stone columns. Influence of column deformation

Experimental simulation and mathematical modelling of clogging in stone column

Principle of Super Position of Rate of Settlement in 2D and 3D Consolidations

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