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J.C. Chai
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Settlement-time curve calculation of soil-cement column and slab improved soft clay deposit S. Pongsivasathit; P. Voottipruex; J.C. Chai
Lowland Technology International Vol 19 No 2, Sep (2017)
Publisher : International Association of Lowland Technology

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The consolidation behavior of soft clayey deposit improved by a floating soil-column with a cement stabilized slab on the ground surface has been investigated by laboratory model test using a symmetric unite cell model and finite element analysis (FEA). The effects of thickness and undrained shear strength of slab on the relative penetration of column into surrounding soil were quantified. Based on the results, the method proposed Pongsivasathit et al. for calculating the settlement of a floating column improved soft subsoil has been modified. The main modification is the equation for calculating the value of Hc, which is the thickness of a soil layer at the bottom of the column improved zone. And in settlement calculation, Hc layer has been treated as an unimproved layer. The effectiveness of proposed method has been verified by comparing with the measurement results of field case histories and laboratory model tests.
Effect of cations on consolidation and permeability of polymerized bentonite N. Prongmanee; J.C. Chai; S. Shrestha
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Properties of a novel material “polymerized bentonite (PB)” and a traditional untreated bentonite (UB) were investigated through two series of laboratory tests (i.e., consolidation test and filter press test). Three different test liquids included of deionized water, 0.6 M NaCl and 0.6 M CaCl2 were used in this study. The results of consolidation tests indicated that the compression index (Cc) and swelling index (Cs) decreased, while the coefficient of consolidation (cv) increased with the increasing in concentration and valence of cation in the solutions. Comparison between two materials in the cationic solutions, the PB had higher Cc and Cs value, but it gave lower cv value compared with that of the UB. The results of estimated permeability (kfilter) from the test results of the filter press showed that the PB gave lower values of kfilter for all the test solutions compared with those of the corresponding UB due to the polymer “locked” Na+ ions carried by the bentonite particles and partially prevented it to be replaced by higher cation charge. Based on the results of permeability, it is suggested that the PB can provide better barrier properties against aggressive cationic solutions compared to that of the UB.
Behavior of an embankment on soft deposit improved by column-link method J.C. Chai; J. Ni; M.D. Liu
Lowland Technology International Vol 21 No 4, March (2020): Special Issue on: Engineering Geology and Geotechniques for Developing Co
Publisher : International Association of Lowland Technology

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The behavior of a test embankment on soft deposit improved by column-link method in Saga, Japan, was investigated by three dimensional (3D) finite element analysis (FEA). In column-link method, the column-walls under the shoulders of an embankment are linked by geogrids or cables to restrict lateral movement of the walls and partially reduce the embankment settlement. A geogrid with a tensile strength of 36 kN/m and yielding strain of 12% was used and relatively large lateral displacement of about 0.18 m occurred. The results of FEA showed that the geogrid might yield. The results indicated that to effectively restrain lateral movement of the walls, geogrids with high tensile strength and stiffness, like steel cables were needed. With the conditions of the test embankment, using steel cables, the mobilized tensile force in the cable could reach more than 600 kN/m. Further, at the upper part of the column walls, high compression or tensile stresses could be developed with strong linking geogrids. Thus, reinforcing the column walls with steel bar or H-steel is required. The results from this study showed a properly designed column-link method could be an effective and economic soft ground improvement method.
Co-Authors J. Ni M.D. Liu N. Prongmanee P. Voottipruex S. Pongsivasathit S. Shrestha