冻融循环作用下土体特性研究进展

发布时间：2018-04-01 05:13

本文选题：冻融循环　切入点：冻融破坏　出处：《太原理工大学学报》2017年03期

【摘要】：中国具有广大的季节性冻土地区,研究冻融循环作用下土体的物理力学特性,对需满足一定强度及稳定性要求的寒区工程建设与防护具有十分重要的指导意义。冻融循环试验是研究土体冻融特性的基础性试验,主要涉及冻融温度、冻融时长及冻融次数3个试验指标的选择,但目前相关学者的研究对此并未给出相对统一的参考依据,给试验方案的确定及试验结果的相互对照造成不便。对目前土体冻融破坏新进展进行了全面综述,分析并介绍了国内外冻融试验方案的确定思路,提出建议性方案;并论述了冻融温度、冻融次数、含水率、塑性指数等对土体冻融破坏的影响及冻融循环作用下土体物理力学性能的研究进展;最后,提出了目前关于土体在冻融损伤机理及本构模型等方面存在的不足及展望。
[Abstract]:There are many seasonal frozen soil regions in China. It is very important to study the physical and mechanical properties of soil under freeze-thaw cycle for the construction and protection of cold regions which need to meet the requirements of strength and stability.Freeze-thaw cycle test is a basic test to study the characteristics of soil freeze-thaw, which mainly involves the selection of three test indexes, such as freezing and thawing temperature, duration and times of freezing and thawing.It is inconvenient to confirm the test scheme and compare the test results.In this paper, the new progress of freezing and thawing failure of soil is comprehensively reviewed, the determination of the test scheme at home and abroad is analyzed and introduced, and the suggestion scheme is put forward, and the freezing and thawing temperature, the times of freezing and thawing, the moisture content, the temperature of freezing and thawing are also discussed.The influence of plastic index on the freeze-thaw failure of soil and the research progress of physical and mechanical properties of soil under freeze-thaw cycle are also discussed. Finally, the shortcomings and prospects of the mechanism of freeze-thaw damage and constitutive model of soil are put forward.
【作者单位】：太原理工大学建筑与土木工程学院;
【基金】：山西省国际科技合作项目(2015081055) 山西省研究生教育创新项目(2015BY25)
【分类号】：TU43

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