Theoretical and Numerical Perspectives and Field Observations for the Design and Performance Evaluation of Embankments Constructed on Soft Marine Clay

Indraratna, Buddhima; Sathananthan, I.; Bamunawita, C.; Balasubramaniam, A.S.

doi:10.1016/b978-0-08-100192-9.00003-x

Cited by 8 publications

(9 citation statements)

References 23 publications

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“…On the other hand, the loading rate that can be applied in practice is controlled by the stability of surcharge fills (Ladd, 1991;Indraratna et al, 2005c;Rujikiatkamjorn & Indraratna, 2009). Specifically, it depends on an increase in shear strength due to consolidation.…”

Section: Multi-ramp Loading Effects and A New Degree Of Dissipationmentioning

confidence: 99%

An analytical solution for consolidation with vertical drains under multi-ramp loading

Gan

Zheng

et al. 2015

Géotechnique

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Various analytical solutions have been proposed for a unit-cell consolidation with a vertical drain under surcharge loading. These solutions involve different assumptions to address various aspects of consolidation. There is a lack of generalised solution for analysing consolidation of soil assisted by a vertical drain under various loading conditions. This paper presents a simplified solution for consolidation under multi-ramp loading. Generalised governing equations of equal-strain consolidation are solved. Simultaneous radial and vertical flow conditions, as well as the combined effects of drain resistance and smear, are taken into account fully. An increase in total stress due to multi-ramp loading is reasonably modelled as a function of both time and depth. An analytical solution to calculate excess pore-water pressure at any arbitrary point in soil is derived by using the method of separation of variables. The conventional definition of the degree of consolidation is given in terms of the dissipation of excess pore-water pressure as a result of the maximum increase in total stress in soil. This definition is interpreted in relation to the ultimate ground surface settlement due to surcharge preloading. Its validity and accuracy are verified by comparing the special cases of the proposed solution with two available analytical solutions. The proposed solution is also validated by a welldocumented case history with settlement and pore-water pressure measurements. Reasonably good agreement is obtained. A new degree of dissipation is defined in terms of the dissipation of excess porewater pressure as a result of currently induced increase in total stress in soil. By using this definition, an equation is proposed to estimate the gain in undrained strength of soil due to consolidation for assessing the stability of surcharge fills more effectively and correctly. The loading path over time and the compressibility of smeared soil are shown to have a potentially important influence on the degree of consolidation and the degree of dissipation.

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Section: Multi-ramp Loading Effects and A New Degree Of Dissipationmentioning

confidence: 99%

An analytical solution for consolidation with vertical drains under multi-ramp loading

Gan

Zheng

et al. 2015

Géotechnique

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“…The value of the smear effect of permeability ratio is difficult to be determined as many uncertainties are involved [19,23,31]. In addition, the value of this parameter is also difficult and complicated to be determined by a laboratory method [5]. Most researchers estimate the value of this parameter based on the literature [5,7], but there are also those who used the method of trial and error and the results were not always consistent [23].…”

Section: Literature Reviewmentioning

confidence: 99%

“…In addition, the value of this parameter is also difficult and complicated to be determined by a laboratory method [5]. Most researchers estimate the value of this parameter based on the literature [5,7], but there are also those who used the method of trial and error and the results were not always consistent [23]. A number of studies reported that the value of the smear effect of permeability ratio is 3 [8,18,24,26,27], and it was employed in numerical solutions and found that the FEM simulation results had relatively high accuracy.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Consolidation of soft soils by PVDs is the most popular techniques because it accelerates consolidation and reduces the drainage path [5]. In addition to improving the slope safety factor, it also reduces the effects of excess pore pressure, minimizes the lateral deformation and bulk vertical hydraulic conductivity of the foundation [6].…”

Section: Introductionmentioning

confidence: 99%

“…There are two parameters of smear effect, i.e., the zone diameter of the smear (ds) and the smear effect of permeability ratio (kr). Traditionally, the researchers determine the value of these parameters based on the literature as there is no comprehensive method to measure it so far [5,7]. Previous studies have reported a range of the smear effect of permeability ratio selected values are from 1.3 to 10.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative Analysis of Settlement and Pore Water Pressure of Road Embankment on Yan soft soil Treated with PVDs

2019

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The application of prefabricated vertical drains (PVDs) in the road embankment construction has been successfully performed in many projects throughout the country. The simulation of finite element method (FEM) can assist engineers in modelling very complex structures and foundations. This paper presents a plane–strain numerical analysis that was performed to verify the effectiveness of the model embankment stabilised with PVD using Plaxis 2D version 8. This study employed the smear effect of permeability ratio (kr) of 3 in the PVD modelling. The data of settlement and pore water pressure in the left and right sides of road embankment were monitored for 177 days, then the data were collected and compared by a numerical simulation. The coefficient of determination (R2) was used to assess the performance of the comparative analysis. The results of numerical simulation on settlement and pore water pressure obtained a coefficient of determination of greater than 0.9 which has reached a good agreement with those of the field measurement. On other the hand, there was no significant difference in the performance between both sides of the embankment. The smear effect parameter (kr = 3) is recommended for PVD designs and can provide accurate FEM prediction.

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Experimental Study on Performance of Prefabricated Vertical Drain on Kaolinite with Various Drain Material

Shrivastava,

Shroff,

Dave

2024

Lecture Notes in Civil Engineering

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Theoretical and Numerical Perspectives and Field Observations for the Design and Performance Evaluation of Embankments Constructed on Soft Marine Clay

Cited by 8 publications

References 23 publications

An analytical solution for consolidation with vertical drains under multi-ramp loading

An analytical solution for consolidation with vertical drains under multi-ramp loading

Comparative Analysis of Settlement and Pore Water Pressure of Road Embankment on Yan soft soil Treated with PVDs

Experimental Study on Performance of Prefabricated Vertical Drain on Kaolinite with Various Drain Material

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