考虑应力历史的冻土一维蠕变模型

发布时间：2018-03-12 16:26

本文选题：冻土蠕变模型　切入点：应力历史　出处：《岩土工程学报》2016年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The stress history is the key factor affecting the mechanical behavior of frozen soil. A one-dimensional creep model considering stress history in thawed soil is introduced and modified accordingly to enable it to react to the influence of temperature on the creep behavior of frozen soil. The related model parameters are obtained by Katt-0 loading test under different temperature conditions, and the functional relationship between each parameter and temperature is obtained by regression analysis. The results of comparison test and model calculation show that, The modified one-dimensional creep model of frozen soil has a good prediction accuracy in predicting the creep development of soil at different temperatures. At the same time, with the increase of applied pressure, The model can accurately describe the phenomenon of rapid strain growth when the external pressure exceeds the maximum pressure in its history. Therefore, the model can be used as a reliable basis for the analysis and design of engineering stability in cold regions.
【作者单位】：中国科学院寒区旱区环境与工程研究所(冻土工程国家重点实验室);中国科学院大学;北京建筑大学;北方民族大学;
【基金】：国家基础科学人才培养基金项目(J1210003/J0109) 北京市属高等学校高层次人才引进与培养计划项目(CIT&TCD20150101) 国家自然科学基金项目(41572268)
【分类号】：TU445

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