Soil-Water Characteristic Curve for Unsaturated Mixed-Soil Considering Physical Form and Dry Density Effect

Abstract:

A test is conducted to get the soil-water characteristic curve for three typical composite unsaturated soils in west Sichuan, considering its physical composition, physical form and dry density. Test data shows that the variation of physical composition, particle size and dry density can result in great change of soil-water characteristic curve. The bigger the dry density is and the more hydrophilic mineral it has, the more gently the soil-water characteristic curve is, and the higher dry density soil sample has higher residual moisture content. In addition, matrix suction decreased with less clay content and more content under the same water content. For three typical composite unsaturated soils, the change of soil-water characteristic curve resulting from variation of dry density is less in bigger water content, and is more in lower water content.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 785-789
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.785
• Online since: August 2013
• Authors: Kai Cui, Hui Huang
• Keywords: Dry Density, Matrix Suction, Physical Composition, Soil-Water Characteristic

References

[1] LIAO Shi-wen, QU Yong-xin: The first national symposium on expansive soil science. (Southwest Jiaotong University Publications, Chengdou1990).

[2] FREDLUND D. G, XING. A: Equations for the soil-water characteristic curve. Canadian Geotechnical Journal, Vol. 31 (1994), p.521.

DOI: 10.1139/t94-061

[3] Vanapalli S.K., Pufahl D. E&Fredlund D. G: The influence of soil structure and stress history on the soil-water characteristic of a compacted till. Geotechnique, Vol. 49 (1999), p.143.

DOI: 10.1680/geot.1999.49.2.143

[4] ZHAN Liang-tong, BAO Cheng-gang, Gong Bi-wei: Soil-water characteristic curve and its application in unsaturated soil mechanics. Wuhan Yangtze river academy of sciences (1998).

[5] JEFFREY T. STOICESCU, MOIR D. HAUG, DELWYN G. FREDLUND: The soil-water Characteristic of Sand-Bentonite Mixtures Used for Liners and Covers. Proceedings of the Second International Conference on Unsaturated Soils, Vol. 2 (1998), p.143.

[6] OBERG-HOGSTA: Comparison of Matrix Suction Values with Water Retention Curves at Threes Test Sites. Proceedings of the Second International Conference on Unsaturated Soils, Vol. 2 (1998), p.368.

[7] LU Jing, Cheng Bin. Research on soil-water characteristic curve of unsaturated loess. Chinese Journal of Geotechnical Engineering, Vol. 29 (2007), p.1591.

[8] LUAN Mao-tian, LI Shun-qun, YANG Qing : Theoretical soil—water characteristic curve for unsaturated soils. Chinese Journal of Geotechnical Engineering, Vol. 27 (2005), p.611.

[9] XU Yong-fu, DONG Ping: Fractal models for the soil-water characteristics of unsaturated soils. Rock and soil mechanics, Vol. 23 (2002), p.400.