飽和砂の非排水繰返し三軸試験における液状化判定について

概要

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The experimental studies on the liquefaction of saturated sand have been developing rapidly since Niigata Earthquake and Alaska Earthquake which brought many damages to foundations or structures, and these studies will give us some suggestion to defent the disaster of sand basement. The cyclic triaxial test typifies the experimental studies on the liquefaction of saturated sand. In this report, the author conducts the cyclic undrained triaxial test of the Kiso river sand, the Nagara river sand and the Ibi river sand. Thus the experimental results indicate that the occurrence of sand liquefaction on the cyclic undrained triaxial test can be judged by the following four criterions: (i) when the cyclic load σ_d begins to decrease; (ii) when the axial strain ε_a increases suddenly; (iii) when the effective stress σ_c' equal zero, namely when the pore water pressure increases to a value equal to the confining pressure σ_c; (iv) when the dent phenomenon occurs in the pore water pressure u.
岐阜工業高等専門学校の論文
1989-02-28