冻土的本构关系

CONSTITUTIVE MODEL OF FROZEN SOIL

对冻土的应力-应变特性进行了深入研究,在姚仰平等考虑温度的UH模型的基础上,提出考虑温度影响适用于冻土的UH模型。与原有考虑温度的UH模型相比,提出的新模型仅增加了1个抗拉强度参数,既能反映冻结黏土的前期固结压力随温度降低而升高的特性,又能反映冻结黏土随温度降低黏聚力提高的强度特性。新模型的温度适用范围为-1^-30℃,与已有的试验结果进行对比,结果显示,新模型能够较为合理地描述冻土的基本力学特性。

Based on the frozen soils stress-strain behavior and the UH model which takes account of the temperature effects,built a new UH model that is suitable for frozen soils was set up. Compared with the original UH model,the new UH model has only added one parameter of tensile strength. The new UH model not only can reflect the behavior that the frozen soils overconsolidation pressure increases with a decrease of temperature,but also can reflect the behavior that the frozen soils strength increases with a decrease of temperature. The range of temperature is-1 ^-30 ℃ in the new UH model,comparison with existing test results shows that the model can reasonably describe the basic mechanical behavior of frozen soils.