Abstract
The strength properties of unsaturated soil are far more complicated than those of saturated soil. As a kind of typical and widely spread unsaturated soil, expansive clay shows a very close relationship between its shear strength and water content, for its high content of hydrophile, such as montmorillonite, illite and etc. The shear strength of soil is of much significance in the design of foundation and slope in expensive soil area. The determination of shear strength for expensive soil is always an important issue in this aspect. Based on the investigation of expansive clay in a slope along Han-Shi highway, Hubei Provence, some unsaturated shear tests with suction control have been conducted, and then, unsaturated mechanical parameters have been obtained using double-variables strength theory, and characteristics of the unsaturated shear strength of the specimen have been explored. Results indicate that slight shear dilatation appeared during the unsaturated shearing course and its value decreases with the increase of confining pressure and suction. For lower suction, the cohesion of the tested soil specimen linearly increases with suction increases. The shear coefficient for testing specimen is 10.7°.
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References
Barbour SL (1998). Nineteenth Canadian Geotechnical Colloquium: The soil-water characteristic curve: a historical perspective [C]// Canadian Geotechnical Journal, 35(5): 873–894.
Bishop AW (1959). The principle of effective stress. Lecture delivered in Oslo, Norway, in 1955, published in Tecknish Ukebland. 106(39): 859–863.
Chen ZH, Wang YS, Xie DY (1994). Effective stress in unsaturated soil. Chinese Journal of Geotechnical Engineering, 16(3): 62–69 (in Chinese).
Chen ZH (2004). Development & application of consolidation apparatus and direct shear apparatus for unsaturated soils. Chinese Journal of Geotechnical Engineering. 26(2): 161–166 (in Chinese).
Deng G & Shen ZJ (2006). Numerical simulation of crack formation process in clays during drying and wetting. Geomechanics and Geoengineering, 1(1): 27–41.
Fredlund DG, Morgenstem NR, Widger RA (1978). The Shear Strength of Unsaturated Soils. Canadian Geotechnical Jounal, 15(3): 313–321.
Fredlund DG, Xing A, Fredlund MD, Barbour SL (1996). The relationship of the unsaturated soil shear strength to the soil-water characteristic curve. Canadian Geotechnical Journal, 33(3): 440–448.
Fredlund DG & Rahardjo H (1997). Soil Mechanics for Unsaturated Soil. Beijing: China Architecture and Building Press.
Gan KM, Fredlund DG, Rahardjio H (1988). Determination of the shear strength parameters of an unsaturated soil using the direct shear test. Canadian Geotechnical Jounal, 25(3): 500–510.
Huat BBK, Ali FH, Hashim S (2005). Modified Shear Box Test Apparatus for Measuring Shear Strength of Unsaturated Residual Soil. American Journal of Applied Sciences, 2(9): 1283–1289.
Kong LW & Tan LR (2000). Study on shear strength and swelling-shrinkage characteristic of compacted expansive soil. Proceedings of the Asian Conference on Unsaturated Soils, Singapore, 515–519.
Lu ZH, Chen ZH, Fang XW, Guo JF, Zhou HQ (2006). Structural damage model of unsaturated expansive soil and its application in multi-field couple analysis on expansive soil slope. Applied Mathematics and Mechanics (English Edition), 27(7): 891–900.
Luan MT, Li SQ, Yang Q (2006). Matric suction, tension suction and their equivalent in four-grain packed unsaturated soils with isolated pore water. Proceedings of the Fourth International Conference on Unsaturated Soils, 2162–2173.
Melinda F, Rahardjo H, Han KK, Leong EC (2004). Shear strength of compacted soil under infiltration condition. Journal of Geotechnical and Geoenvironmental Engineering. 130(8): 807–817.
Miao LC, Sandra LH, Ying C, Yuan JP (2007). Relationship between soil structure and mechanical behavior for an expansive unsaturated clay. Canadian Geotechnical Journal, 44(2): 126–137.
Miao TD, Mu QS, Liu ZY, Ma CW (2001). Effective stress and shear strength of unsaturated soil with low water content. Chinese Journal of Geotechnical Engineering. 23(4): 393–396 (in Chinese).
Vilar OM (2006). A simplified procedure to estimate the shear strength envelope of unsaturated soils. Canadian Geotechnical Journal, 43(10):1088–1095.
Xiao HB, Zhang CS, He J, Fan ZH (2007). Expansive soil-structure interaction and its sensitive analysis. Journal of Central South University of Technology. 14(3): 425–430.
Xu YF (2004). Fractal approach to unsaturated shear strength. Journal of Geotechnical and Geoenvironmental Engineering. 130(3): 264–273.
Yang HP & Xiao D (2005). The influence of alternate dry-wet effect on the strength characteristic of expansive soils. Journal of Changsha University of Science and Technology (Natural Science). 2(2): 1–5 (in Chinese).
Ye WM, Chen B, Bian ZX, Zhu HH, Bai Y (2006). Triaxial shear strength of Shanghai unsaturated soft clay. Chinese Journal of Geotechnical Engineering. (3): 317–321 (in Chinese).
Zhan TLT & Ng CWW (2006). Shear strength characteristics of an unsaturated expansive clay. Canadian Geotechnical Journal, 43(7): 751–763.
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© 2010 Zhejiang University Press, Hangzhou and Springer-Verlag Berlin Heidelberg
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Ye, WM., Zhang, YW., Chen, B., Zhang, SF. (2010). Characteristics of Shear Strength of Unsaturated Weak Expansive Soil. In: Chen, Y., Zhan, L., Tang, X. (eds) Advances in Environmental Geotechnics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04460-1_45
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DOI: https://doi.org/10.1007/978-3-642-04460-1_45
Publisher Name: Springer, Berlin, Heidelberg
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