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J. Saowapakpiboon
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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CETEAU PVD VACUUM SYSTEM IN SOFT BANGKOK CLAY: A CASE STUDY OF THE SUVARNABHUMI AIRPORT PROJECT J. Saowapakpiboon; D. T. Bergado; S. Hayashi; J. C. Chai; N. Kovittayanon; T. P. de Zwart
Lowland Technology International Vol 10 No 1, June (2008)
Publisher : International Association of Lowland Technology

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A new improvement technique is currently applied for soft Bangkok clay combining capped PVD with vacuum pressure and embankment loading whereby the prefabricated vertical drains (PVD) are connected by PE tubes to a vacuum pump called “CeTeau PVD Vacuum System”. The method uses a surface soil layer as a sealing layer for leakage protection and there is no need to place air-tightening geomembrane sheets on the ground surface. This method has two advantages for situations of a) high air/water permeability layer exist near the ground surface, and b) combining vacuum pressure with embankment load. An actual field project combining PVD vacuum and embankment loading has just been completed. The performance data of the system during the improvement of the section EW-4, a part of the third runway of Suvarnabhumi International Airport, Thailand are presented and interpreted. The monitored data indicated that the system mobilized -60 kPa atmospheric pressure. This allowed for unprecedented loading and settlement rates during the construction of an embankment and achieved the required degree of consolidation within the specified time period. The prediction by PVDCON FEM Software generally agreed with the observed values. As expected, increasing the Kh/Ks and OCR values resulted in lower settlement values.
COMPARISON ON THE PERFORMANCE OF PREFABRICATED VERTICAL DRAIN (PVD) PRELOADING COMBINED WITH AND WITHOUT VACUUM AND HEAT J. Saowapakpiboon; D. T. Bergado; S. Artidteang
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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This paper focus on performance of prefabricated vertical drain (PVD) preloading combined with and without vacuum and heat to accelerate the consolidation of soft Bangkok clay. The laboratory tests were conducted using reconstituted specimens in large scale consolidometers combined with and without vacuum and heat. The flow parameters were back calculated in terms of the horizontal coefficient of consolidation (Ch) and the ratio between the horizontal permeability in undisturbed zone (kh) to the horizontal permeability in smear zone (ks) or (kh/ks) based on Hansbo (1979) method. The back-calculation analysis results show that the combination of vacuum pressure and heat can increase the horizontal coefficient of consolidation, Ch of 126.42% and decrease of kh/ks of 63.33%. Furthermore, vacuum can increase higher rate of consolidation temperature can decrease viscosity of pore water by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rate of consolidation and higher magnitude of settlement.
INVESTIGATION OF TENSILE AND SOIL-GEOTEXTILE INTERFACE STRENGTH OF KENAF WOVEN LIMITED LIFE GEOTEXTILES (LLGS) S. Artidteang; D. T. Bergado; T. Tanchaisawat; J. Saowapakpiboon
Lowland Technology International Vol 14 No 2, Dec (2012)
Publisher : International Association of Lowland Technology

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Most geotextiles are made from polypropylene or polyester polymers formed into woven and nonwoven fabric. Recently, new type of geotextile called Limited life Geotextiles (LLGs) made of natural fibers are utilized. Natural fibers are renewable fibers that can be sustainable into woven geotextiles for various geotechnical engineering applications. Geotextiles have been widely used to improve short term stability of embankments on soft clay by two functions: tensile reinforcement and as a drainage element. The paper presents the results of experimental investigation from the suitable pattern of woven Kenaf LLGs for soil reinforcement. Three patterns of weaving Kenaf LLGs were obtained, namely: plain, knot-plain, and hexagonal patterns. Tensile strength tests were conducted in warp and weft directions to select the most appropriate pattern for soil reinforcement application. The plain pattern of woven Kenaf LLGs is the most appropriate pattern due to its high tensile strength. Moreover, large scale direct shear tests were carried out to find the interface strength of Kenaf woven LLGs with sand backfill material as well as the sand backfill materials under different normal confining pressures of 40, 80, and 120 kPa. The important variables for LLGs reinforcement structure design and analysis were investigated. Furthermore, pullout tests were performed using normal confining pressures of 20, 40 and 60 kPa which cover the range of possible applied confining pressures in the field applications. Slippage failure occurred below the normal confining pressure of 40 kPa and tensile failure occurred at higher normal confining pressures.
Co-Authors D. T. Bergado J. C. Chai N. Kovittayanon S. Artidteang S. Hayashi T. P. de Zwart T. Tanchaisawat