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受力历史是影响冻土力学行为的关键因素。引入融土中考虑应力历史的一维蠕变模型并进行了相应修正,使其能够反应温度对冻土蠕变特性的影响,通过不同温度条件下的K_0加载试验获取相关模型参数,经过回归分析得到了各参数与温度的函数关系。通过对比试验和模型计算结果表明,修正后得到的冻土一维蠕变模型在预测不同温度条件下土体的蠕变发展规律时具有较好的预测精度。同时,随着施加压力的增大,该模型能够准确描述当外压力超过其历史上所受最大压力时所产生的应变急剧增长现象。因此,该模型可以作为寒区工程稳定性分析和设计的可靠依据。
The history of stress is the key factor affecting the mechanics behavior of frozen soil. The one-dimensional creep model considering the history of stress and the corresponding correction were introduced to make it able to reflect the influence of temperature on the creep characteristics of frozen soil. The model parameters were obtained by K0 loading test under different temperature conditions. After regression analysis The function of each parameter as a function of temperature is obtained. The results of comparative experiments and model calculations show that the revised one-dimensional creep model of frozen soils has good prediction accuracy in predicting the creep development of soils under different temperature conditions. At the same time, as pressure increases, the model accurately describes the rapid strain growth that occurs when the external pressure exceeds its maximum pressure history. Therefore, the model can be used as a reliable basis for stability analysis and design of cold engineering.