QUANTITATIVE EVALUATION OF MICROSTRUCTURE FEATURES OF PORES IN SUBGRADE SOIL IN SEASONAL FROST REGIONS OF NORTHEAST CHINA

ZHAO Anping; WANG Qing; LI Yang; CHE Qian

Volume 16 Issue 2

Oct. 2010

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ZHAO Anping, WANG Qing, LI Yang, CHE Qian. 2008: QUANTITATIVE EVALUATION OF MICROSTRUCTURE FEATURES OF PORES IN SUBGRADE SOIL IN SEASONAL FROST REGIONS OF NORTHEAST CHINA. JOURNAL OF ENGINEERING GEOLOGY, 16(2): 233-238.

Citation:

ZHAO Anping, WANG Qing, LI Yang, CHE Qian. 2008: QUANTITATIVE EVALUATION OF MICROSTRUCTURE FEATURES OF PORES IN SUBGRADE SOIL IN SEASONAL FROST REGIONS OF NORTHEAST CHINA. JOURNAL OF ENGINEERING GEOLOGY, 16(2): 233-238.

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QUANTITATIVE EVALUATION OF MICROSTRUCTURE FEATURES OF PORES IN SUBGRADE SOIL IN SEASONAL FROST REGIONS OF NORTHEAST CHINA

College of Constructional Engineering, Jilin University, Changchun 130026

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Received Date: 2007-09-12
Rev Recd Date: 2007-12-17
Publish Date: 2008-04-30

Abstract

Abstract

Subgrade freeze-thawing injury is an important problem that has puzzled many engineers in the seasonal frost regions of northeast China such as the cit of Chang-chun. In winter. weather in Chang-chun is very frigidity. Water in subgrade is moving and assembling in some positions under gradient of ground temperature So, subgrade is frost heave. In spring, subgrade and ice lenses which assembled in some positions begin thawing. The subgrade soil is in saturation or over saturation states. The bearing capacity is very low. Under the action of traffic vehicles, bulges, elastic springs, fractures and soil boiling can appear on pavement, which give very bad injuries to communication, transportation, and economic construction. It is urgent and necessary to research every influencing factor that affects frost heave. Pores as one of important symbols of soil structure are main entryways of water movement in soil. They decide sensibility of frost heave of the soil. In the paper, the WD-5 SEM is used to collect microstructure photos of soils from three different locations nearby Chang-chun. The photos are further used to make quantitative analysis to microstructure of pores in soil. An image quantitative analysis system is used. The quantitative analysis results in the finding that microscopic pore diameters of three samples are mainly about 5 m. This pore size makes soils have property of frost heave. There aren't noticeable difference of microcosmic pores between vertical and horizontal sections from a same sample. There are radial or reticular structure of pores, and shapes of oblate or equiaxial. The analysis further leads to the finding that when pore shape fractal dimensions are higher, there are many big pores, and the pore distribution is simple. The research site is suitable for water movement in the subgrade, therefoe, the frost heave is strong.
- Frost heave,
- Soil boiling,
- Microstructure,
- Pore feature,
- Image quantitative analysis,
- Fractal dimensions

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References(1)

References

[1] 徐学祖,王家澄,张立新.冻土物理学
[M].北京:科学出版社,2001.
Xu Xuezu, Wang Jiacheng, Zhang Lixin. Frost soil physics. Beijing: Science Publishing Company,2001.

[2] 张喜发,辛德刚,张冬青等.季节冻土区高速公路路基土中的水分迁移变化
[J].冰川冻土,2004, 26 (4):454~460.
Zhang Xifa, Xin Degang, Zhang Dongqing, etc.. Water migration and variation in the subgrade soils of express way in seasonally frozen ground regions. Journal of Glaciology and Geocryology, 2004, 26 (4):454~460.

[3] 黄小铭.我国寒区道路工程中冻土问题研究的回顾
[J].冰川冻土,1988, 10 (3):344~351.
Huang Xiaoming. Review about the research on permafrost problems of road engineering in cold region, in China. Journal of Glaclology and Geocryology, 1988, 10 (3):344~351.

[4] 朱春润.索科洛夫 B.H.成都粘性土孔隙性的微观研究
[J].地质灾害与环境保护,1994, 5 (3):38~47.
Zhu Chunrong. Sokolov V.N. Microscopical study of porosity of Chengdu clay. Geological Hazards and Environment Preservation, 1994, 5 (3):38~47.

[5] 袁琴.基于ERDAS的淤泥质土微观结构孔隙的分形特征研究
[J].资源环境与工程,2005, 19 (4):323~326.
Yua Qin. Researches on fractal characteristics of micropore texture of silty soil Based on erdas. Resources Environment and Engineering, 2005, 19 (4):323~326.

[6] 王长明,肖树芳,夏玉斌.海积软土微观结构定量化及固结模型研究
[J].长春科技大学学报,2001, 31 (4):363~367.
Wang Changming, Xiao Shufang, Xia Yubin. Research on structured model of consolidation of mar-ine soft soil. Journal of Changchun University of Science and Technology, 2001, 31 (4):363~367.

[7] 施斌.粘性土微观结构定向性的定量研究
[J].地质学报,1997, 71 (1):36~43.
Shi Bin. Quantitative research on the orientation of of microstructure of clayey soil. Acta Geologica Sinica, 1997, 71 (1):36~43.

[8] 王清,陈慧娥,蔡可易.水泥土微观结构特征的定量评价
[J].岩土力学,2003, 24 (增1):12~16.
Wang Qing, Chen Hui'e, Cai Keyi. Quantitative evaluation of microstructure features of soil contained some cement. Rock and Soil Mechanics, 2003, 24 (suppl. 1):12~16.

[9] Mandelbrot B B. Fractal Geometry of Nature. San Francisco:Freeman,1982.

[10] 王宝军,施斌,刘志彬,蔡奕.基于GIS的黏性土微观结构的分形研究
[J].岩土工程学报,2004, 26 (2):244~247.
Wang Baojun, Shi Bin, Liu Zhi bin, Cai Yi. Fractal study on microstructure of clayey soil by GIS. Chinese Journal of Geotechnical Engineer, 2004, 26 (2):244~247.

[11] 王宝军,等.基于GIS实现黏性土颗粒形态的三维分形研究
[J].岩土工程学报,2007, 29 (2):309~312.
Wang Baojun. Tri-dimensional fractal study on particle shape of clayey soil by GIS. Chinese Journal of Geotechnical Engineer, 2007, 29(2):309~312.

[12] MOORE C, Donaldson C.F. Quantifying soil microstructure using fractals
[J]. Geotechnique, 1995, 45 (1):105~116.

[13] 王家澄,程国栋.孔隙特征对材料在冻结过程中位移的影响
[J].冰川冻土,1993, 15 (1):182~185.
Wang Jiacheng, Cheng Guodong. Influence of porous characteristic of material on displacement during freeing. Journal of Glaciology and Geocryology,1993, 15 (1):182~185.

[14] 姜龙,王连俊,张喜发.季冻区公路路基砂类土冻胀分类研究
[J].工程地质学报,2007, 156 (5):629~645.
Jiang Long, Wang Lianjun, Zhang Xifa. Classification of frost heave for subgrade sand soil of highways in seasonal frost regions. Journal of Engineering Geology, 2007, 15 (5):629~645

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