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S. Artidteang
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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.
Performance of Ruzi Grass Combined with Woven Limited Life Geotextiles (LLGS) for Soil Erosion Control S. Artidteang; D.T. Bergado; S. Chaiyaput; T. Tanchaisawat; L.G. Lam
Lowland Technology International Vol 18 No 1, June (2016)
Publisher : International Association of Lowland Technology

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Natural fibers can be made into woven geotextile and combined with growing vegetation for slope protection. Thailand has highly abundant natural fibers and rural communities have been converting them into handicrafts. The water hyacinth yarns were fabricated to woven geotextile called limited life geotextiles (LLGs) to help stabilize the slope and improved the growth of vegetation for erosion control in geotechnical application. The study was aimed to assess the effectiveness of the LLGs new material for geotextile made from water hyacinth combined with Ruzi grass to control soil erosion in a representative slope. The erosion control test was performed by using the artificial rainfall. The flow rates of water runoff and amount of soil loss were investigated. Consequently, the limited life geotextiles made from water hyacinth LLGs combined with Ruzi grass can reduce the flow rate of runoff and amount of soil loss.
Co-Authors D. T. Bergado D.T. Bergado J. Saowapakpiboon L.G. Lam S. Chaiyaput T. Tanchaisawat