相同剪切波速的原状与重塑饱和松散粉土的抗液化强度
Cyclic liquefaction resistances of undisturbed and remolded saturated loose silts with the same shear wave velocity
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摘要: 采用剪切波速与振动三轴联合试验装置,研究了具有松散结构的原状和重塑饱和粉土抗液化强度之间的相关性。结果表明,具有松散结构的原状与重塑饱和土样的振动应变随振动次数的变化趋势是一致的。如果把重塑饱和土样的初始剪切波速恢复到原状饱和土样的初始剪切波速,重塑土样的抗液化强度也被恢复到原状土样的抗液化强度。此时,原状与重塑土样的抗液化强度与抗液化强度曲线之间的相关系数大于0.89,而且这种良好的相关性与确定破坏振次的液化判别标准无关。这里的研究结果支持饱和松散试验土样的初始剪切波速可以作为控制其抗液化强度的一个关键参数。Abstract: The correlation between cyclic liquefaction resistance of undisturbed and remolded saturated loose silts was studied using the cyclic triaxial apparatus with measurements of shear wave velocity.It was shown that the variation of peak-to-peak axial strain of undisturbed saturated specimens was the same as that of remolded saturated specimens.If the initial shear wave velocity of remolded saturated specimens was restored to that of undisturbed saturated specimens,the cyclic liquefaction resistance of remolded specimens was also restored to that of undisturbed specimens and the correlation coefficients between cyclic liquefaction resistance curves and test results were large than 0.89.The results supported that the initial shear wave velocity of loose saturated soils was a key parameter controlling its cyclic liquefaction resistance.
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