Estimation of Degree of Consolidation for Vacuum Preloading Projects

Chu, Jian; Yan, Shuwang

doi:10.1061/(asce)1532-3641(2005)5:2(158)

Cited by 87 publications

(34 citation statements)

References 5 publications

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“…6. As shown by Chu and Yan (2005) using case studies, the DOC estimated using settlement data is generally greater than that using pore water pressure data. This can be partially explained by the fact that when only limited instruments can be used, settlement and pore water pressure gauges will be installed only at the locations where the maximum settlement and pore water pressure will be likely to occur.…”

Section: Field Monitoring and Data Interpretationmentioning

confidence: 89%

“…The DOC can be estimated based on the pore water pressure profile using the method suggested by Chu and Yan (2005). One example is shown in Fig.…”

Section: Field Monitoring and Data Interpretationmentioning

confidence: 99%

“…As a result, the DOC tends to be overestimated when settlement data are used and underestimated when pore water pressure data are used. It has bee suggested by Chu and Yan (2005) that for contracting purpose, it is necessary to specify the method used to calculate the DOC and indicate clearly whether the DOC is to be estimated using settlement or pore water pressure data.…”

Section: Field Monitoring and Data Interpretationmentioning

confidence: 99%

See 2 more Smart Citations

Vacuum Preloading Techniques — Recent Developments and Applications

Chu¹,

Yan²,

Indraratna³

2008

GeoCongress 2008

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Section: Field Monitoring and Data Interpretationmentioning

confidence: 89%

“…The DOC can be estimated based on the pore water pressure profile using the method suggested by Chu and Yan (2005). One example is shown in Fig.…”

Section: Field Monitoring and Data Interpretationmentioning

confidence: 99%

Section: Field Monitoring and Data Interpretationmentioning

confidence: 99%

See 1 more Smart Citation

Vacuum Preloading Techniques — Recent Developments and Applications

Chu¹,

Yan²,

Indraratna³

2008

GeoCongress 2008

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show abstract

“…Another possibility of assessing the degree of consolidation is based on pore water pressure measurements (Chu and Yan, 2005). The average degree of consolidation can be calculated as…”

Section: Pore Pressure-based Methods (Chu and Yan 2005)mentioning

confidence: 99%

Settlement Calculation and Back-Analysis of Soil Properties for a Test Embankment on a Soft Clay Ground Improved by PVD and Vacuum-Assisted Preloading at a Site in Vung Tau, Viet Nam

Quang

Dang

2013

Springer Series in Geomechanics and Geoengineering

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Abstract. Application of vacuum assisted preloading is helpful when a considerable load is required to meet the desired rate of settlement and an increase in the undrained shear strength in a relative short time. To facilitate the vacuum propagation, vertical drains are usually employed in conjunction. A pilot test was carried out at a land reclamation project to study the effect of ground improved by vacuum combined with PVD and surcharge preloading on the rate of consolidation of a soft clay at the site of Saigon International Terminals Vietnam (SITV) in Ba Ria-Vung Tau Province, Viet Nam. Theorectical analysis were conducted to interpret the field measurements of pore pressure and settlement, and consolidation parameters were back -calculated. The degree of consolidation estimated from the settlement is higher than that obtained from the pore-pressure dissipation measurement. The coefficient of consolidation back-calculated from the settlement is slightly larger than that obtained from the pore-pressure measurement. Furthermore, undrained shear strength was back-calculated and compared with those obtained from soil investigation after treatment.

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“…Tianjin Port is approximately 100 km from Beijing, China, as reported by Chu and Yan (2005). Due to the rapid expansion of the port, construction of a new pier on reclamation land was required for a new storage facility.…”

Section: General Description Of Embankment Characteristics and Site Cmentioning

confidence: 99%

2D and 3D Numerical Modeling of Combined Surcharge and Vacuum Preloading with Vertical Drains

2008

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Abstract:This paper presents a three-dimensional (3D) and two-dimensional (2D) numerical analysis of a case study of a combined vacuum and surcharge preloading project for a storage yard at Tianjin Port, China. At this site, a vacuum pressure of 80 kPa and a fill surcharge of 50 kPa was applied on top of the 20m thick soft soil layer through prefabricated vertical drains (PVD) to achieve the desired settlements and to avoid embankment instability. In 3D analysis, the actual shape of PVDs and their installation pattern with the in-situ soil parameters were simulated. In contrast, the validity of 2D-plane strain analysis using equivalent permeability and transformed unit cell geometry was examined. In both cases, the vacuum pressure along the drain length was assumed to be constant as substantiated by the field observations. The finite element code, ABAQUS, using the modified Cam-clay model was used in the numerical analysis. The predictions of settlement, pore water pressure and lateral displacement were compared with the available field data, and an acceptable agreement was achieved for both 2D and 3D numerical analyses. It is found that both 3D and equivalent 2D analyses give similar consolidation responses at the vertical cross section where the lateral strain along the longitudinal axis is zero. The influence of vacuum may extend more than 10m from the embankment toe, where the lateral movement should be monitored carefully during the consolidation period to avoid any damage to adjacent structures.

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Estimation of Degree of Consolidation for Vacuum Preloading Projects

Cited by 87 publications

References 5 publications

Vacuum Preloading Techniques — Recent Developments and Applications

Vacuum Preloading Techniques — Recent Developments and Applications

Settlement Calculation and Back-Analysis of Soil Properties for a Test Embankment on a Soft Clay Ground Improved by PVD and Vacuum-Assisted Preloading at a Site in Vung Tau, Viet Nam

2D and 3D Numerical Modeling of Combined Surcharge and Vacuum Preloading with Vertical Drains

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