Innovative thermal technique for enhancing the performance of prefabricated vertical drain during the preloading process

Abuel-Naga, Hossam; Bergado, Dennes T.; Chaiprakaikeow, Susit

doi:10.1016/j.geotexmem.2006.04.003

Cited by 109 publications

(42 citation statements)

References 24 publications

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“…A number of experiments were carried out to investigate the influence of temperature on the behaviors of soils. For example Baldi et al [2] examined experimentally the effect of temperature on the volumetric deformations of clay skeleton and clay-water system under constant effective stress and isotropic loading conditions at different constant temperatures; Tanaka et al [16] and Burghignoli et al [3] investigated the effect of temperature on the mechanical behavior of reconstituted and natural clayey soil specimens using the modified triaxial cells; Sultan et al [15] identified experimentally the effect of temperature on the pre-consolidation pressure of the Boom clay and the effect of the overconsolidation ratio on the thermal volume changes by performing temperaturecontrolled isotropic compression tests; Abuel-Naga et al [1] carried out tests on the soft Bangkok clay to investigate the effect of temperature on its engineering behavior and concluded that its shear strength and hydraulic conductivity improve with the increase of soil temperature under drained heating conditions.…”

Section: Introductionmentioning

confidence: 99%

A double hardening thermo-mechanical constitutive model for overconsolidated clays

Liu

Xing

2008

Acta Geotech.

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On the basis of a double hardening model for clays and available experimental results, a new thermoelasto-plastic constitutive model for saturated clays is proposed to describe the effects of temperature and overconsolidation ratio on the mechanical properties of saturated clays. Two hardening parameters are introduced: r 0 c and a. The proposed model is then applied to simulate the relevant important features of saturated clays with different overconsolidation ratios under different temperature and loading conditions. The model predictions are compared with available experimental results to demonstrate its accuracy and usefulness.

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Section: Introductionmentioning

confidence: 99%

A double hardening thermo-mechanical constitutive model for overconsolidated clays

Liu

Xing

2008

Acta Geotech.

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“…The maximum temperature of the heat source was about 728C after 8 h; the heat was applied by means of a flexible electric wire heater installed through the core of the PVD. 26 …”

Section: Consolidometer Test Programmementioning

confidence: 99%

Reduction of smear effects around PVD using thermo-PVD

Pothiraksanon¹,

Saowapakpiboon²,

Bergado³

et al. 2008

Proceedings of the Institution of Civil Engineers - Ground Impr

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This paper presents the effects of raising the temperature of soft Bangkok clay, up to 90°C, in combination with the performance of prefabricated vertical drains (PVD) during the preloading process called thermo-PVD, as measured in laboratory model tests. For both reconstituted and undisturbed specimens, higher settlements were observed for the soil specimens with thermo-PVD loaded with constant vertical stress. Furthermore, using thermo-PVD, Kh/Ks decreased while the coefficient of horizontal consolidation Ch increased for both the undisturbed and reconstituted specimens, which resulted in an increased rate of consolidation. This behaviour can be attributed to an increase in the hydraulic conductivity of the soil as the soil temperature increased within the smear zone surrounding the PVD. Therefore, using thermo-PVD, which combines a heat source and drainage with the PVD, the drainage performance can be enhanced by reducing the drainage retardation effects in the smear zone around the thermo-PVD.

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“…Usually, a surcharge load equal to or greater than the expected loading is applied over the soil surface to generate the necessary hydraulic gradient needed for vertical drainage through the PVDs. Application of PVDs method is widely used in soft ground improvement (Shen et al, 2005;Chai et al, 2006a,b;Abuel-Naga et al, 2006;Rowe and Taechakumthorn, 2008) The instability problem of the surcharge embankment dictates the height and slope of the embankment. The PVD improvement with surcharge embankment can be combined with vacuum pressure to decrease the problem of embankment instability, to reduce fill material, to accelerate the rate of consolidation and to shorten construction periods.…”

Section: Introductionmentioning

confidence: 99%

Measured and predicted performance of prefabricated vertical drains (PVDs) with and without vacuum preloading

Saowapakpiboon

Bergado

Youwai

et al. 2010

Geotextiles and Geomembranes

102

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Innovative thermal technique for enhancing the performance of prefabricated vertical drain during the preloading process

Cited by 109 publications

References 24 publications

A double hardening thermo-mechanical constitutive model for overconsolidated clays

A double hardening thermo-mechanical constitutive model for overconsolidated clays

Reduction of smear effects around PVD using thermo-PVD

Measured and predicted performance of prefabricated vertical drains (PVDs) with and without vacuum preloading

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