LIQUEFACTION PROPERTIES AND POSTLIQUEFACTION UNDRAINED SHEAR BEHAVIOUR OF NONPLASTIC SILTY FINE SANDS

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  • 非塑性シルト質細砂の液状化と液状化後の強度変形特性

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A series of undrained triaxial tests was conducted in order to evaluate liquefaction properties, strength and deformation characteristics after liquefied, and small strain stiffness of fine sands containing nonplastic silt. Tested materials were prepared by mixing silica sand No. 6, in which particles with a diameter larger than 0.25 mm were removed from the original material, and nonplastic silt called ‘‘DL clay’’. Cylindrical specimens having a dimension of 5 cm in diameter and 10 cm in height were produced by wet tamping method. The test results showed that: 1) the liquefaction resistance decreased with increasing fines content ranging from 0 to 50%; 2) the postliquefaction undrained strength increased with decreasing fines content under otherwise the same condition; 3) no clear tendency was observed in the relationship between the liquefaction resistance and small strain stiffness; and 4) the liquefaction resistance correlated with secant Young's modulus at a vertical strain of 0.1% and undrained shear strength without undrained cyclic loading history.

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