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Predicting the hydraulic conductivity of makassar marine clay using field penetration test (Cptu) results
Harianto T.
Asian and Pacific Coasts 2011 Proceedings of the 6th International Conference
Abstract
Recently, the Cone Penetration testing (CPT) is a rapid method for determining the mechanical and transport properties of soils. The CPT provides continuous profiles of soil characteristics that are reliable, fast, and economical. Moreover, the estimation of the hydraulic conductivity from the CPT is traditionally made from the pore pressure dissipation test data. The Hydraulic conductivity for clay soil is primarily determined by the laboratory test..The main objective of this research is to develop correlation between CPTu (field-laboratory) test data and hydraulic conductivity, and the determination of the hydraulic conductivity that can overcome the drawbacks of the conventional dissipation test method. The method proposed here is based on the analysis of the steady-state pore pressure during the piezocone penetration test, so that the full interaction between the piezocone and the soil is considered. The study area was located in the coastal area of Makassar city, Indonesia. The results indicate that the cone resistance as well as the sleeve friction exhibits a very good linear relationship with the hydraulic conductivity value of marine clay. Furthermore, the exponential relationship was found between the friction ratio and pore water pressure. The relationship between the cone resistance and hydraulic conductivity was also found to be exponential. However, the dissipation of pore water pressure shown linear relationship. Finally, The comparison between results obtained this study shown that a good correlation obtained in order to predict the hydraulic conductivity based on the CPTu results and indicated that there is some potential of using this correlation value in engineering practice.