K_0-CONSOLIDATION IN A TRIAXIAL CELL AND EVALUATION OF IN-SITU K_0 FOR MARINE CLAYS WITH VARIOUS CHARACTERISTICS

概要

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A series of K_0-consolidation tests in a triaxial cell was carried out for marine clays collected from different areas in the world in order to investigate the behavior during K_0-consolidation tests and evaluate K_0-values that are required for laboratory tests with recompression techniques, FEM analysis using elasto-plastic constitutive equations, etc. It was confirmed that the famous equation K_<0NC> = 1-sinφ' is useful; however, the definition of φ' should be concerned. Inthe case using φ' corresponding to a critical state line, i.e. (q/p)_<max>, the equation underestimates K_<0NC> by 0.05 ; in contrast, in the case using φ' corresponding to a peak strength, i.e. (q)_<max>, the equation overestimates K_<0NC> by 0.05. This study proposes a procedure for estimating the in-situ K_0-value. For a representative undisturbed clay sample, K_0-consolidation and K_0-overconsolidation tests (i.e. SHANSEP test) are consecutively carried out to obtain the K-OCR relationship. Using the profile of OCR obtained from a series of oedometer tests, the K-value corresponding to the OCR can be calculated as the in-situ K_0. The K_0-values obtained from both the K_0-overconsolidation test corresponding to the OCR in the laboratory and the flat dilatometer test (DMT test) in the field compared well.
社団法人地盤工学会の論文
2003-02-15