Reduction of smear effects around PVD using thermo-PVD

Pothiraksanon, Chanidnun; Saowapakpiboon, J.; Bergado, Dennes T.; Than, N. Y.

doi:10.1680/grim.2008.161.4.179

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…Taking the projects into consideration, a horizontal smear zone with the midpoint of the EKG electrode as the center and with its width at 2b s will be formed during the treatment of combined reinforcement, as shown in Figure 1. The hydraulic permeability coefficient of this area is less than k h , which is assumed to be k s [45,46]. Additionally, radial seepage with the EKG drainage body as its center will be formed under vacuum loading when reinforcing the soft foundation.…”

Section: Establishment Of Consolidation Equation For Combined Methods 21 Mathematical Modelmentioning

confidence: 99%

Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential

Feng

Shen

et al. 2021

J. Cent. South Univ.

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Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods. Many studies indicate that the soil electrical potential is non-linearly distributed in the treatment process by the combined method. However, in the previous theoretical study, the non-linear-distribution impacts of soil's electrical potential on soft soil foundation treatment have not been considered. It is always assumed to be linear distribution, which is different from the experimental results. In this paper, the coupling consolidation model of this technology under the two-dimensional plane strain condition is initially established; and the well resistance effect, the vacuum load decreasing along the soil depth and the non-linear variation of electrical potential in the soil are considered. Then, the analytical solutions of the average excess pore water pressure and soil's consolidation degree in the anode affected area are acquired based on the soil's electrical potential distribution. Finally, the rationality of the analytical solution is testified by conducting an experimental model test, which proves the scientificity of the analytical solution. The analytical solution is adopted to better predict the dissipation of excess pore water pressure and soil consolidation degree when using the combined technology. This study can provide a reference with more accuracy for the engineering practices of this combined technology in the future.

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Section: Establishment Of Consolidation Equation For Combined Methods 21 Mathematical Modelmentioning

confidence: 99%

Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential

Feng

Shen

et al. 2021

J. Cent. South Univ.

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“…Examples include the use of electrical PVDs (Jones 2002;Chew et al 2004) and thermal PVDs (Pothiraksanon et al 2008). Examples include the use of electrical PVDs (Jones 2002;Chew et al 2004) and thermal PVDs (Pothiraksanon et al 2008).…”

Section: Chaptermentioning

confidence: 99%

Deformation Analysis in Soft Ground Improvement

Chai

Carter

2011

Geotechnical, Geological, and Earthquake Engineering

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“…This result shows that the higher the temperature, the higher the volume contraction and the higher the rate of consolidation. Thus, heating the clay has achieved higher settlement and also a faster rate of consolidation than PVD only (Abuel-Naga et al, 2006a; Pothiraksanon et al, 2008). The compressibility increases due to thermally induced irreversible contraction of saturated normally consolidated soft Bangkok clay.…”

Section: Back-calculation Of Coefficient Of Consolidation (C H ) and mentioning

confidence: 99%

“…To reduce the drainage retardation effects of the smear zone adjacent and around the PVDs, the effects of an innovative thermal technique capable of enhancing the performance of PVDs in soft Bangkok clay were investigated by Abuel-Naga et al (2006a) and Pothiraksanon et al (2008) in the consolidometer in the laboratory test.…”

Section: Introductionmentioning

confidence: 99%

Soft ground improvement with solar-powered drainage

Pothiraksanon¹,

Saowapakpiboon²,

Bergado³

et al. 2010

Proceedings of the Institution of Civil Engineers - Ground Impr

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In this study, raising the temperature of soft Bangkok clay up to 90°C using solar-powered prefabricated vertical drains during a preloading process was investigated in full-scale field tests. Two identical 6 m high, full-scale test embankments for preloading were constructed over the soft Bangkok clay where a conventional vertical drainage system was installed underneath one embankment and a solar-powered system was utilised for the other. Analyses were carried out to determine the flow parameters by back-calculation of field settlements in terms of the horizontal coefficient of consolidation (Ch) and the ratio between the horizontal hydraulic conductivity in the undisturbed zone (Kh) to the horizontal hydraulic conductivity in the smear zone (Ks). The field test analysis based upon the back-calculated results shows that the Kh/Ks values were 6·2 and 4·1 for drainage without and with heat, respectively, with corresponding Ch values of 6·8 and 8·5 m2/year, respectively. Thus, the use of solar heating can increase the drainage performance by reducing the drainage retardation effects in the smear zone around the drain.

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Reduction of smear effects around PVD using thermo-PVD

Cited by 12 publications

References 16 publications

Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential

Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential

Deformation Analysis in Soft Ground Improvement

Soft ground improvement with solar-powered drainage

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