Case studies on design strength evaluation of marine deposits using combined method of unconfined compression test and triaxial test in seaport projects

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  • TSUCHIDA Takashi
    Hiroshima University Resilient Research Center, Tsuchida Geotechnical Institute

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  • 一軸圧縮強度と簡易CU強度を併用した海底地盤の強度評価法の港湾事業における事例と考察

Abstract

<p>We collected the results of geotechnical surveys at 11 locations in 7 seaports where the design shear strength of the clayey ground was evaluated by using the combined method. In the combined method, for each soil sample taken by the fixed piston sampler, both the unconfined compressive strength and the strength of triaxial CU compression test were carried out to estimate the quality of the soil sample. The quality-evaluation results of 283 samples classified to the regions I (good or very good), II (moderate), III (poor) and IV (very poor) were 49.5%, 25.1%, 9.5%, and 15.9%, respectively. The satisfactory quality was 74.6% when "good or very good" and "moderate" were combined. The average ratio of the Su(UCS), the average of qu/2 to Su(SCU), the simple CU strength was 0.773, which was slightly higher than the moderate 0.75. A practical design shear strength evaluation method was proposed for the cases where more than half of samples (50-70%) are classified to regions I and II and some (25% or less) are classified to be regions IV.</p>

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