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P. H. Giao
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GEOTECHNICAL CHARACTERIZATION OF SOFT CLAY ALONG A HIGHWAY IN THE RED RIVER DELTA P. H. Giao; D. H. Hien
Lowland Technology International Vol 9 No 1, June (2007)
Publisher : International Association of Lowland Technology

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Abstract

The Red River Delta (RRD) consists mostly of Pleistocene to Holocene deposits, including soft clays. Besides environmental hazards such as flood, storm, coastal erosion, saltwater instruction and contamination of ground water, the wide distribution of soft clay has caused obvious geotechnical difficulties for infrastructure development projects. It is observed that the economic growth of this booming region of Vietnam goes at a faster rate than that of the infrastructure development and the latter has not yet been supported by a modern geotechnical investigation practice. Data analysis and soil characterization become even more difficult for a long linear infrastructure like a road or highway, whose route runs over different soil types. This study deals with a comprehensive geotechnical characterization of soft soils underlying the national highway No. 18 (NH18) that has often had problems of differential settlements or other construction damages. Besides the common approach of lumping testing data in the averaged graphs and tables, visualizations were made to assist in characterization of the soil layers. A number of empirical correlative relationships were deduced for various geotechnical parameters, especially the undrained shear strength and the cone tip resistance.
AN ASSESSMENT ON SOIL DISTURBANCE OF BANGKOK CLAY SAMPLES IN RELATION WITH THE INTRINSIC COMPRESSION BEHAVIOR P. H. Giao; N. Phien-wej; H. Tanaka
Lowland Technology International Vol 6 No 2, Dec (2004)
Publisher : International Association of Lowland Technology

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Recent reseraches have again stirred up the soil disturbance issue and clearly indicated how significantly it could affect on soil characterization, empirical relationship between different soil parameters and, d=finally, design calculations. In this study, analyses of sample quality were carried out for a large amount of the samples taken from a coastal site near the Gulf of Thailand. The results of the study on intrinsic, compression suggested that Bangkok clay seems to be less cemented than some other clays known for being strictured like Pusan or Louseville clays. By putting this finding next to the fact that Bangkok clay has not a big thickness, one can consider that the soil disturbance of Bangkok clay would not be so critical. On the other hand, the analysis have indicated that samples collected by the procedure of wash boring and Shelby sampling tube as commonly practiced in Bangkok plain were clearly subjected to soil disturbance. Consequently, quality of Bangkok clay samples to be tested should not be taken for granted as it has been for decades, and more studies on disturbance of Bnagkok clay as well as an improvement in sampling procedure are therefore needed.
Co-Authors D. H. Hien H. Tanaka N. Phien-wej