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Buddhima Indraratna - One of the best experts on this subject based on the ideXlab platform.
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large strain vacuum assisted consolidation with non darcian Radial flow incorporating varying permeability and compressibility
Journal of Geotechnical and Geoenvironmental Engineering, 2017Co-Authors: Buddhima Indraratna, Rui Zhong, Patrick J Fox, Cholachat RujikiatkamjornAbstract:AbstractA numerical solution has been developed for large-strain consolidation incorporating non-Darcian (nonlinear) Radial flow with varying compressibility and permeability coefficients. The solution can accommodate both conventional fill surcharge as well as vacuum preloading. The smear effect caused by mandrel-driven vertical drains is also captured in the analysis. The proposed model is verified by comparing it with FEM simulation, existing laboratory data, other existing theoretical solutions, and its advantage of capturing the multiple factors influencing Radial Drainage and consolidation is demonstrated. The effects of non-Darcian flow are found to be significant for obtaining an accurate solution, unlike numerous past solutions that are based on linear Darcy flow. The salient finding of this study is that the conventional small-strain theory can overestimate the rate of consolidation with Radial Drainage, especially for highly compressible soils such as estuarine clays under substantial preloadin...
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analytical solution and numerical simulation of vacuum consolidation by vertical drains beneath circular embankments
Computers and Geotechnics, 2016Co-Authors: Buddhima Indraratna, Cholachat Rujikiatkamjorn, Mojtaba E Kan, D M Potts, S W SloanAbstract:Abstract This paper presents an analytical solution and numerical simulation of vacuum consolidation beneath a circular loading area (e.g. circular oil tanks or silos). The discrete system of vertical drains is substituted by continuous concentric rings of equivalent drain walls. The effectiveness of the vacuum as distributed along the drain length and the well resistance of the drains are considered. A rigorous solution of Radial Drainage towards cylindrical drain walls is presented and compared to numerical FEM predictions. The model is then successfully adopted to analyse the vacuum consolidation of a circular embankment in the Ballina field testing facility in Australia.
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Papers Faculty of Engineering and Information Sciences
2016Co-Authors: Cholachat Rujikiatkamjorn, Buddhima Indraratna, Kourosh Kianfar, Darshana PereraAbstract:Soft clay properties for non-Darcian Radial Drainage with vacuum preloading, based on Rowe cell restin
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soft clay properties for non darcian Radial Drainage with vacuum preloading based on rowe cell resting
2014Co-Authors: Buddhima Indraratna, Cholachat Rujikiatkamjorn, Kourosh Kianfar, Darshana PereraAbstract:Application of vacuum pressure with prefabricated vertical drains in soft clays is a popular and effective ground improvement method. Application of vacuum pressure via vertical drains generates a negative excess pore water pressure (PWP) resulting in an immediate increase in effective stress. This paper summarises the recent advancements in vacuum preloading based on laboratory studies, using the conventional and modified Rowe cells. Location and the magnitude of the average PWP and degree of consolidation during vacuum preloading are investigated. Based on the laboratory experiments a new Radial consolidation model is proposed for vacuum preloading incorporating non-Darcian flow. Disciplines Engineering | Science and Technology Studies Publication Details Indraratna, B., Kianfar, K., Rujikiatkamjorn, C. & Perera, D. (2014). Soft clay properties for non-Darcian Radial Drainage with vacuum preloading, based on Rowe cell resting. Australian Geomechanics Journal, 49 (4), 183-190. This journal article is available at Research Online: http://ro.uow.edu.au/eispapers/3418
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Radial consolidation modelling incorporating the effect of a smear zone for a multilayer soil with downdrag caused by mandrel action
Canadian Geotechnical Journal, 2010Co-Authors: Cholachat Rujikiatkamjorn, Buddhima IndraratnaAbstract:A system of prefabricated vertical drains with surcharge preloading is an effective method for promoting Radial Drainage and accelerated soil consolidation. A piecewise technique is employed to ana...
Evert C Lawton - One of the best experts on this subject based on the ideXlab platform.
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estimation of time rate of settlement for multilayered clays undergoing Radial Drainage
Transportation Research Record, 2013Co-Authors: Clifton B Farnsworth, Steven F. Bartlett, Evert C LawtonAbstract:This paper demonstrates how the finite difference technique can be used to estimate the time rate of settlement for soft, compressible clayey soils treated with prefabricated vertical drains at sites where primary consolidation settlement is occurring in a multilayered system at varying rates. Semiempirical methods based on surface settlement monitoring have typically been used to estimate the progression of primary consolidation settlement. However, interpretation of such methods can be problematic for multilayered soil profiles. For such sites, it is crucial to obtain a reasonable characterization of the foundation soils' horizontal Drainage properties and include these estimates in the time rate of settlement projections. Field monitoring of subsurface instrumentation is extremely valuable in providing additional information about the consolidation behavior of different layers. When subsurface field measurements are coupled with the proposed numerical method, far more reliable projections are obtained....
Cholachat Rujikiatkamjorn - One of the best experts on this subject based on the ideXlab platform.
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large strain vacuum assisted consolidation with non darcian Radial flow incorporating varying permeability and compressibility
Journal of Geotechnical and Geoenvironmental Engineering, 2017Co-Authors: Buddhima Indraratna, Rui Zhong, Patrick J Fox, Cholachat RujikiatkamjornAbstract:AbstractA numerical solution has been developed for large-strain consolidation incorporating non-Darcian (nonlinear) Radial flow with varying compressibility and permeability coefficients. The solution can accommodate both conventional fill surcharge as well as vacuum preloading. The smear effect caused by mandrel-driven vertical drains is also captured in the analysis. The proposed model is verified by comparing it with FEM simulation, existing laboratory data, other existing theoretical solutions, and its advantage of capturing the multiple factors influencing Radial Drainage and consolidation is demonstrated. The effects of non-Darcian flow are found to be significant for obtaining an accurate solution, unlike numerous past solutions that are based on linear Darcy flow. The salient finding of this study is that the conventional small-strain theory can overestimate the rate of consolidation with Radial Drainage, especially for highly compressible soils such as estuarine clays under substantial preloadin...
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analytical solution and numerical simulation of vacuum consolidation by vertical drains beneath circular embankments
Computers and Geotechnics, 2016Co-Authors: Buddhima Indraratna, Cholachat Rujikiatkamjorn, Mojtaba E Kan, D M Potts, S W SloanAbstract:Abstract This paper presents an analytical solution and numerical simulation of vacuum consolidation beneath a circular loading area (e.g. circular oil tanks or silos). The discrete system of vertical drains is substituted by continuous concentric rings of equivalent drain walls. The effectiveness of the vacuum as distributed along the drain length and the well resistance of the drains are considered. A rigorous solution of Radial Drainage towards cylindrical drain walls is presented and compared to numerical FEM predictions. The model is then successfully adopted to analyse the vacuum consolidation of a circular embankment in the Ballina field testing facility in Australia.
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Papers Faculty of Engineering and Information Sciences
2016Co-Authors: Cholachat Rujikiatkamjorn, Buddhima Indraratna, Kourosh Kianfar, Darshana PereraAbstract:Soft clay properties for non-Darcian Radial Drainage with vacuum preloading, based on Rowe cell restin
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soft clay properties for non darcian Radial Drainage with vacuum preloading based on rowe cell resting
2014Co-Authors: Buddhima Indraratna, Cholachat Rujikiatkamjorn, Kourosh Kianfar, Darshana PereraAbstract:Application of vacuum pressure with prefabricated vertical drains in soft clays is a popular and effective ground improvement method. Application of vacuum pressure via vertical drains generates a negative excess pore water pressure (PWP) resulting in an immediate increase in effective stress. This paper summarises the recent advancements in vacuum preloading based on laboratory studies, using the conventional and modified Rowe cells. Location and the magnitude of the average PWP and degree of consolidation during vacuum preloading are investigated. Based on the laboratory experiments a new Radial consolidation model is proposed for vacuum preloading incorporating non-Darcian flow. Disciplines Engineering | Science and Technology Studies Publication Details Indraratna, B., Kianfar, K., Rujikiatkamjorn, C. & Perera, D. (2014). Soft clay properties for non-Darcian Radial Drainage with vacuum preloading, based on Rowe cell resting. Australian Geomechanics Journal, 49 (4), 183-190. This journal article is available at Research Online: http://ro.uow.edu.au/eispapers/3418
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Radial consolidation modelling incorporating the effect of a smear zone for a multilayer soil with downdrag caused by mandrel action
Canadian Geotechnical Journal, 2010Co-Authors: Cholachat Rujikiatkamjorn, Buddhima IndraratnaAbstract:A system of prefabricated vertical drains with surcharge preloading is an effective method for promoting Radial Drainage and accelerated soil consolidation. A piecewise technique is employed to ana...
Arul Arulrajah - One of the best experts on this subject based on the ideXlab platform.
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step loading compression of ultra soft soil under Radial Drainage conditions
Marine Georesources & Geotechnology, 2016Co-Authors: Kai Sin Wong, Victor Choa, Arul Arulrajah, Suksun HorpibulsukAbstract:Step loading compression measurements of ultra-soft soil, obtained from marine environment, were carried out with a hydraulic consolidation cell at the moisture contents of 150 and 168%. Three different Drainage conditions were tested: Radial outward, inward, and both inward and outward Drainages. Ultra-soft soil showed a significant settlement in the first step of loading. There was little pore pressure dissipation, which implies little effective stress gain and with large magnitude of settlement in low stress range. New compression parameters , , and are proposed for viscous and intrinsic states inclusive of low stress log cycles. A correlation between void ratio at 10 kPa effective stress () and void ratio at liquid limit eL was proposed and the relevant compression parameters were predicted. The magnitudes of settlements at various loadings were subsequently predicted using the proposed basic equations and were found to agree well with the measured data. Dimensionless time factor curves for various ra...
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Preloading and prefabricated vertical drains design for foreshore land reclamation projects: a case study
Ground Improvement, 2007Co-Authors: Myint Win Bo, Arul Arulrajah, Hamid NikrazAbstract:The Changi East Reclamation Project in Singapore comprises land reclamation in foreshore conditions. As the foreshore area was underlain by a thick layer of soft marine clay, a high magnitude of primary and secondary consolidation settlement was expected, owing to fill and future live load. An average fill thickness of 10 m was predicted to contribute to a magnitude of settlement greater than 2 m over a period of several decades. In order to minimise this expected future settlement, it was necessary to accelerate the consolidation process to complete the majority of the settlement during construction stage. A combination of prefabricated vertical drains (PVDs) with preloading ground improvement was successfully applied in this project. The technique comprises the installation of prefabricated vertical drains and the subsequent placement of surcharge to accelerate the consolidation of the underlying marine clay. This paper discusses the theories of Radial Drainage and the preloading technique, and consider...
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one dimension compression of slurry with Radial Drainage
Soils and Foundations, 1999Co-Authors: Bo Myint Win, Victor Choa, Arul ArulrajahAbstract:The behavior of the self-weight consolidation of suspension has been studied by the Oxford group (Been and Sills, 1981). However the deformation behavior of slurry-like soil upon additional load is not well understood. Due to the high demand for land in coastal areas and surrounding city areas, reclamation or remediation of land on ultra soft soil like waste ponds and mine tailing ponds has become necessary. Materials in such waste ponds and mine tailing ponds are extremely soft, and high water content which is usually above the liquid limit. In addition to this, these materials are in an underconsolidated condition and are still undergoing self-weight consolidation. A laboratory study with a large diameter consolidation cell equipped with pore water pressure transducers was carried out to find out the deformation behavior of slurry-like soil under a one dimensional vertical load. It was noted that before commencing Terzaghi's consolidation process, the slurry was deformed solely due to the expelling of water from the slurry. This deformation was as high as 19% strain and no pore water pressure dissipation was detected during this period. The behavior in the laboratory results was confirmed by a case study carried out with a trail embankment on slurry-like soil contained in the containment bund.
Clifton B Farnsworth - One of the best experts on this subject based on the ideXlab platform.
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estimation of time rate of settlement for multilayered clays undergoing Radial Drainage
Transportation Research Record, 2013Co-Authors: Clifton B Farnsworth, Steven F. Bartlett, Evert C LawtonAbstract:This paper demonstrates how the finite difference technique can be used to estimate the time rate of settlement for soft, compressible clayey soils treated with prefabricated vertical drains at sites where primary consolidation settlement is occurring in a multilayered system at varying rates. Semiempirical methods based on surface settlement monitoring have typically been used to estimate the progression of primary consolidation settlement. However, interpretation of such methods can be problematic for multilayered soil profiles. For such sites, it is crucial to obtain a reasonable characterization of the foundation soils' horizontal Drainage properties and include these estimates in the time rate of settlement projections. Field monitoring of subsurface instrumentation is extremely valuable in providing additional information about the consolidation behavior of different layers. When subsurface field measurements are coupled with the proposed numerical method, far more reliable projections are obtained....
