| 高温冻土物理力学特性研究现状 |
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| 引用本文： | 刘世伟,张建明.高温冻土物理力学特性研究现状[J].冰川冻土,2012,34(1):120-129. |
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| 作者姓名： | 刘世伟 张建明 |
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| 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,甘肃兰州730000／中国科学院研究生院,北京100049;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,甘肃兰州,730000 |
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| 基金项目： | 国家自然科学基金，冻土工程国家重点实验室自主研究课题 |
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| 摘 要： | 高温冻土又称近相变区冻土,通常用来描述相对较高温度的冻土.由于其温度区间处于冻土的剧烈相变区,冻土中冰和未冻水的比例对温度的变化极其敏感,因此,高温冻土的物理力学性质具有强烈的不稳定性,极易在温度变化的影响下发生实质性改变.基于有关高温冻土物理力学性质研究的文献,综述了高温冻土的定义及其温度界限,同时论述了未冻水对高温冻土物理力学性质的巨大影响,并提出了一种在冻结状态下高温冻土中未冻水孔隙水压力的测试方法.重点从强度特征、变形特性以及本构模型三方面对高温冻土力学特性的研究现状进行了总结和分析,并提出要进一步探究高温冻土变形机理及本构模型,可以为高温不稳定多年冻土区各类工程的基础变形及稳定性预报、评价提供理论基础.
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| 关 键 词： | 高温冻土 未冻水含量 孔隙水压力 物理力学特性 |
Review on Physic-Mechanical Properties of Warm Frozen Soil |
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| LIU Shi-wei,ZHANG Jian-ming.Review on Physic-Mechanical Properties of Warm Frozen Soil[J].Journal of Glaciology and Geocryology,2012,34(1):120-129. |
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| Authors: | LIU Shi-wei ZHANG Jian-ming |
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| Institution: | 1(1.State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | Warm frozen soil refers to the frozen soil in the temperature range with severe phase changes.The term of warm frozen soil is usually used for describing frozen soil in relatively higher temperature blow 0 ℃.As a result of the temperature range with severe phase changes,the proportion of ice to unfrozen water is extremely sensitive to temperature change.Therefore,warm frozen soil is prone to considerable variation in physic-mechanical properties.Based on documents on physic-mechanical properties of warm frozen soil,the definition and temperature boundary of warm frozen soil are reviewed in this paper.It is revealed that unfrozen water has a tremendous impact on the physic-mechanical properties of warm frozen soil,and pointed out that to measure the pore water pressure in the warm frozen soil is meaningful and interesting.The general findings of recent researches are reviews in this paper.The mechanical properties of warm frozen soil are summarized from three different respects,including strength characteristics,deformation properties and constitutive models.In order to provide theoretical basis for analysis of deformation and stability of foundations for various engineering projects in warm permafrost regions,further researches on the mechanism of deformation and proper constitutive model of warm frozen soil is around the corner. |
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| Keywords: | warm frozen soil unfrozen water content pore water pressure physic-mechanical properties |
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