冻融循环作用下土体特性研究进展
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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。
China has a large seasonal frozen soil region.The study of physical and mechanical properties of soil under the action of freeze-thaw cycles,for the need to meet certain strength and stability requirements of cold region engineering,has important guiding significance to the construction and protection.Freeze-thaw cycle test is a basic test in studying the characteristics of soil freezing and thawing,mainly involving three test indexees:the temperature,time and number of freezing and thawing,but current research related scholars gave not reached a relatively unified reference basis for facilitationg the determination of test scheme and the comparasion of test results.In this paper,a the comprehensive review is given on the progress in the soil freezing and thawing damage research,the determination of freeze-thaw test scheme is introduced and analyzed,and a consgruetive,scheme is put forward.The influence of the freezing and thawing temperature,number,moisture content,plasticity index of soil on the freeze-thaw damage is discussed,and the research progress in physical and mechanical properties under the action of freezethaw cycles is reviewed.Finally,the deficiencies and prospects of current studies on the soil in the freezing and thawing damage mechanism and constitutive model are given.
China has a large seasonal frozen soil region.The study of physical and mechanical properties of soil under the action of freeze-thaw cycles,for the need to meet certain strength and stability requirements of cold region engineering,has important guiding significance to the construction and protection.Freeze-thaw cycle test is a basic test in studying the characteristics of soil freezing and thawing,mainly involving three test indexees:the temperature,time and number of freezing and thawing,but current research related scholars gave not reached a relatively unified reference basis for facilitationg the determination of test scheme and the comparasion of test results.In this paper,a the comprehensive review is given on the progress in the soil freezing and thawing damage research,the determination of freeze-thaw test scheme is introduced and analyzed,and a consgruetive,scheme is put forward.The influence of the freezing and thawing temperature,number,moisture content,plasticity index of soil on the freeze-thaw damage is discussed,and the research progress in physical and mechanical properties under the action of freezethaw cycles is reviewed.Finally,the deficiencies and prospects of current studies on the soil in the freezing and thawing damage mechanism and constitutive model are given.
引文
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