Abstract
In the foundation design, the geotechnical engineering parameters are of great importance. As a case study, the laboratory test results of two locations (Banpu and Lac Hoa) in Vinh Chau coast of Vietnam were analysed to acquire the accurate strength for clayey soil. Due to the sample disturbance, the undrained shear strength s u from unconfined compression test are not so reliable, while su from direct quick shear tests (DSq) are more representative in Vinh Chau. A regression analysis between the DSq tests and soil depth had been carried out, good linear correlations are provided for all the three clayey layers in Banpu and Lac Hoa, the results are relatively similar for each clay layer, indicating a same sedimentary and stress history. Furthermore, the normalised undrained shear strengths s u/σ v0’ presented negative linear correlation of liquidity index, and the regression equations have been provided to rapid and cautious estimation of Vinh Chau clay in the future, using the liquidity index.
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