簡易せん断試験機によるさんご石灰質砂の液状化抵抗とせん断強度回復に関する研究

概要

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The paper aims to examine the features of coral calcareous sand (Chi-bishi and kouri sands) as the material of grain crushability. The experiment was carried under undrain shear condition via 3 typed-tests: Monotonic test, stress controlled test, strain controlled test.The results was followed: (1) As to Monotonic test, angle of shear resistance of chi-bishi sand is bigger than Thyoura sand, regardless of relation density. (2) According to Stress and Strain controlled test, Chi-bishi sand had shown larger value of liquefaction resistance. (3) Trial to recompression after strain controlled test, it found that the shear strength value of Chi-bishi sand greatly increased compared with the unchanged Thyoura sand.