长期冻融循环引起黄土强度劣化的试验研究

董晓宏; 张爱军; 连江波; 郭敏霞

长期冻融循环引起黄土强度劣化的试验研究

董晓宏^1,2,
张爱军^1,2, ,,
连江波^1,2,
郭敏霞^1,2

1.
西北农林科技大学水利与建筑工程学院杨凌 712100;
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兰州 730000

基金项目:

国家自然科学基金项目(50779058),冻土工程国家重点实验室开放基金项目(SKLFSE200803).

详细信息

作者简介:
董晓宏,主要从事岩土力学与工程方面的研究工作.Email: wwwdxh0529@126.com

通讯作者:
张爱军，主要从事非饱和特殊土理论与岩土工程数值计算工作.Email:zaj@nwsuaf.edu.cn

中图分类号: TU411.7
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出版历程
- 收稿日期: 2009-11-19
- 修回日期: 2010-01-25
- 刊出日期: 2010-12-25

LABORATORY STUDY ON SHEAR STRENGTH DETERIORATION OF LOESS WITH LONG-TERM FREEZING-THAWING CYCLES

DONG Xiaohong^1,2,
ZHANG Aijun^{1,2
, ,},
LIAN Jiangbo^1,2,
GUO Minxia^1,2

1.
College of Water Resources and Architectural Engineering,Northwest A &|F University,Shaanxi,Yangling 712100;
2.
Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000

摘要

摘要: 以陕西杨凌地区黄土为研究对象,进行了不同含水率、不同干密度的黄土在不同冻融循环次数作用下的直剪试验,探索出进行黄土反复冻融循环试验的方法和控制标准,探讨了封闭系统下黄土在反复冻融循环作用下的抗剪强度劣化特性规律。试验结果表明:黄土在反复冻融循环作用下,表面破坏比较严重; 随着冻融次数的增加,黄土的黏聚力先减小后增大,最低值发生在10次冻融循环之内; 内摩擦角基本不变; 反复冻融循环作用在3～5次对黄土强度有较大的影响,会导致黄土强度的劣化现象发生,但长期冻融作用则会主要体现在对黄土表面的变形破坏等其他方面。
- 黄土 /
- 冻融循环 /
- 抗剪强度 /
- 黄土劣化
Abstract: By taking the loess of Yangling area in Shaanxi province as the research object,a direct shear test is conducted with different water contents,dry densities and times of freezing-thawing cycles. The tests are to explore the way and the criterion of long-term freezing-thawing cycles.Then the characteristic of loess deterioration with long-term freezing-thawing cycles is studied in a closed system.The test result show that: (1)in the condition of long-term freezing-thawing cycles,the surface of loess is destroyed greatly; (2)the cohesion of loess decreases firstly and increases later according to the suggestion.The freezing-thawing cycles and the minimum value are normally appeared in ten freezing-thawing cycles.The internal friction angle of loess keeps invariable basically. The strength of loess is affected greatly in three-five freezing-thawing cycles,which can lead to strength deterioration of loess.But with the time going,the influence of freezing-thawing cycles is reflected on the transmutation of loess surface.
- Loess /
- Freezing-thawing cycles /
- Shear strength /
- Loess deterioration

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参考文献(1)

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