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S. Chaiyaput
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Reconfirmation of Skempton-Bjerrum 2D to 3D settlement conversion using FEM of full scale embankments S. Chaiyaput; D.T. Bergado
Lowland Technology International Vol 20 No 1, June (2018)
Publisher : International Association of Lowland Technology

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Abstract

The soil is a production of natural process, which is highly variable with very complex properties, and soil behavior can be difficult to calculate. Numerical Simulation can be applied to deal with the numerous aspects of complex geotechnical structures. The 3D FEM simulation model can present the conditions of the geotechnical project in details and assumptions, which are similar to actual situations, but the process of running the 3D FEM analysis takes longer computer time. Therefore, 2D FEM simulation model is proposed to reduce calculation time, but the prediction results are usually overestimated. Accordingly, this paper re-analyzed the 2D analysis to represent the performance of 3D analysis based on Skempton-Bjerrum method. The simulated 2D and 3D FEM settlement results had been carried out and compared with the measured data of two full scale embankments including the dissipation of the excess pore pressure. Consequently, it was confirmed that predicted result of 2D and 3D FEM numerical simulation agreed with the correction of Skempton-Bjerrum method that can be applied to predict the final settlements in 3D conditions.
Mitigations of flooding and soil erosions Geo-Disasters in Thailand and Laos due to climate change: From Mountains to Lowlands D. T. Bergado; S. Chaiyaput; P. Voottipruex; T. Hino; N. Chanmee
Lowland Technology International Vol 19 No 1, June (2017)
Publisher : International Association of Lowland Technology

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In 2011, Thailand has suffered from devastating flooding due to climate change. During this time, 2 typhoons from the Pacific area went straight across Vietnam to Northern Laos and Northern Thailand instead of the usual path to Taiwan and Japan. Subsequently, huge flooding damaged many infrastructures and overtopped flood protection dikes of many industrial estates and educational institutions in the Central Plain of Thailand such as at Hi-Tech Industrial Estate, Bang Pa- In Industrial Estate, Navanakorn Industrial Estate and Asian Institute of Technology, to name a few. The same phenomenon also occurred in neighboring Laos PDR which caused unusually heavy rains and widespread river flooding. Consequently, riverbank erosions accompanied by slope failures occurred at Xedon River in Pakse, Southern Laos due to saturation caused by high water levels accompanied by high velocity flow of the flooded river. To evaluate the stability of these mitigation structures, finite element and limit equilibrium methods were utilized. PLAXIS 2D software was used to analyze the slope protection schemes at low and high water levels incorporating the various supporting and reinforcing materials. Moreover, the PLAXIS 2D software was also utilized to predict the vertical deformations of improved flood control dikes with increased embankment height at different cases of flood water levels. In addition, the SLIDE software was used to predict the factor of safety by using limit equilibrium method for the various riverbank erosion protection structures. Furthermore, RESSA software was utilized to evaluate the slope stability of the erosion protection structures with geosynthetic reinforcements of Xedon riverbank in Pakse combined with gabions and mattresses. Laos PDR is mountainous with high elevations.
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.
Effect of Boundary Conditions in Segmental Lining Model on its Sectional Force S. Chaiyaput; M. Sugimoto
Lowland Technology International Vol 18 No 1, June (2016)
Publisher : International Association of Lowland Technology

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Nowadays, underground construction becomes popular as the demand for infrastructure in urban areas increases. To develop underground space in an urban area, it is important to investigate ground surface settlement and damage to existing neighbouring structures. Consequently, 3D finite element method (FEM) continuum models have been developed. This paper introduces a 3D FEM continuum model, which can consider, longitudinal joints, circumferential joints, and nontension boundary between lining and ground, and examines the effect of boundary condition at the tunnel end and ground stiffness on the lining behavior (i.e., bending moment, axial force, normal effective earth pressure, and segment displacement) in the case of staggered building. As a result, it was found that the boundary condition at the tunnel end does not significantly affect the sectional force, except for the axial force in the case of soft soil; The two-ring model provides the safe side results from the viewpoint of segment design; and it can be adopted for segmental lining design and lining behavior simulation.
Co-Authors D. T. Bergado D.T. Bergado L.G. Lam M. Sugimoto N. Chanmee P. Voottipruex S. Artidteang T. Hino T. Tanchaisawat