Study on <i>φ’</i> of normally consolidated marine clay using simple CU test

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  • 簡易CU試験を用いた海底粘土地盤の正規圧密状態でのφ’の評価に関する検討

Abstract

<p>The simplified CU test is a test to determine the strength of seabed clay soil, and is a triaxial CIU test in which a clay sample is isotropically consolidated at 2/3 of the in-situ effective overburden pressure σv0’. From a series of laboratory test, of Tokyo Bay marine clay with overconsolidation ratio of 1.00-2.77, the internal friction angle φ’SCU obtained with c’ = 0 in the simple CU test was compared with the internal friction angle φ’NC obtained by the triaxial CIU test consolidating to the normal consolidation state. Regarding the representative valueφ’NC(AVG.), the relationships φ’NC(AVG.)=(0.75-0.95)φ’SCU and φ’NC(AVG.)=(0.85-1.05) φ’SCU were obtained for the highly plastic clay layer with a liquidity limit of 100% or more and for the low-plasticity clay with a liquidity limit of 60% or less, respectively. </p>

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