关键词: K0固结, 人工冻土, 刚度特性

Abstract: The small-strain stiffness characteristic of artificially frozen soil in deep alluvium was investigated at different initial confining pressures and frozen temperatures by secant Young’s modulus representing the soil stiffness. The influence of freezing on stiffness is investigated by comparing the behavior of frozen and unfrozen soils with similar conditions. It is observed that the variation of Young’s modulus E0 with the confining pressure, represented the magnitude of the initial stiffness, mainly depends on the variation of ice in frozen soils with the confining pressure, not on the soil itself. The frozen soils secant Young’s modulus may decay with increasing strain after keeping a stage of constant value, the threshold yield strain was found to be approximately 0.05 % for all tested conditions. On the other hand, the stiffness of studied frozen soils and its degradation was heavily response to the initial confining pressure amplitude and temperature fluctuation.

Key words: K0 consolidation, artificially frozen soil, stiffness characteristic