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冰川冻土 ›› 2014, Vol. 36 ›› Issue (4): 886-894.doi: 10.7522/j.issn.1000-0240.2014.0106

• 冻土模型与冻土物理力学性质 • 上一篇    下一篇

低含水率非饱和高温冻土模型

李蒙蒙1,4, 牛永红2, 李先明3, 慕青松1,4, 汪江红1,4   

  1. 1. 兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000;
    2. 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;
    3. 哈大铁路客运专线有限公司, 辽宁 沈阳 110002;
    4. 兰州大学 土木工程与力学学院, 甘肃 兰州 730000
  • 收稿日期:2014-03-21 修回日期:2014-06-22 出版日期:2014-08-25 发布日期:2014-08-23
  • 作者简介:李蒙蒙(1988-),男,陕西蓝田人,2012年毕业于延安大学,现为兰州大学硕士研究生,主要从事寒区岩土工程和冻土力学方面的研究.E-mail:limm12@lzu.edu.cn
  • 基金资助:
    国家自然科学基金项目(41071045);铁道部科技研究开发计划项目(Z2012-062);冻土工程国家重点实验室自主立项课题(SKLFSE-ZY-15)资助

A model of unsaturated warm frozen soil with low water content

LI Mengmeng1,4, NIU Yonghong2, LI Xianming3, MU Qingsong1,4, WANG Jianghong1,4   

  1. 1. Key Laboratory of the Western Disaster and Environmental Mechanics, Ministry of Education, Lanzhou University, Lanzhou 730000, China;
    2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. Harbin-Dalian Railway Passenger Dedicated Line Co. Ltd., Shenyang 110002, China;
    4. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
  • Received:2014-03-21 Revised:2014-06-22 Online:2014-08-25 Published:2014-08-23

摘要: 在低含水率非饱和土模型的基础上,从冻土物理特性出发,只考虑毛细吸力和附加压力的作用,建立了非饱和高温冻土细观结构模型,并结合相关实验数据资料改进了高温冻土未冻水含量的经验关系式,基此推导出孔隙水压力、有效应力以及抗剪强度随温度、含水量的变化关系. 同时,通过理论计算与实验(实测)结果进行对比分析,发现本模型能够很好地反映非饱和高温冻土的相关物理力学特性,尤其在定性上能够与宏观实测结果相吻合. 最后,基于非饱和高温冻土微观模型,对非饱和高温冻土的有效应力、抗剪强度进行了讨论分析,给出了合理的理论解释,并对高温冻土相关物理力学特性做出了定性的理论预测.

关键词: 非饱和冻土, 孔隙水压力, 抗剪强度, 有效应力

Abstract: Based on the model of unsaturated soil with low water content and the physical properties of frozen soil, a microstructure model for warm frozen soil with low water content is developed, in which only the effects of additional internal pressure and capillary suction are taken into account. An empirical formula for unfrozen water content of warm frozen soil is improved based on many relevant experiment data. Through these efforts, the relations among temperature, water content and the pore water pressure are gained. The shear strength for the unsaturated warm frozen soil with low water content is also obtained. Through a comparison between the theoretical calculations and experiment results, it is found that the model could well describe qualitatively the physical properties of warm frozen soil. At last, this theoretical model is used to discuss and analyze the effective stress and shear strength of unsaturated warm frozen soil, which not only give a reasonable theoretical explanation, but also predict the physical properties of warm frozen soil qualitatively.

Key words: unsaturated frozen soil, pore water pressure, shear strength, effective stress

中图分类号: 

  • P642.14