The strength anisotropy of a residual soil in Singapore
The undrained shear strength of soil is one of the most important parameters required for geotechnical design. Depending onthe design situations, the undrained shear strength of soil may have to be determined by different tests. In this paper, some testing data on thedetermination of the undrained shear strength of a residual soil in Singapore are presented. Large blocks of undisturbed residual soil sampleswere taken from a construction site of the Deep Tunnel Sewerage System Project in Singapore. To study the inherent strength anisotropy,specimens cut in both vertical and horizontal directions were tests. The anisotropy behaviour of intact residual soil was also investigatedunder different major principal stress directions. The tests conducted included K0 consolidated undrained triaxial compression (CK0UC) andextension (CK0UE) tests, and K0 consolidated undrained direct simple shear (CK0UDSS) tests. Based on the experimental results, the cu/s10versus OCR relationships of each type of tests are established for practical applications. The failure envelopes and friction angles determinedfrom different types of tests are also compared.>
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