Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8535
Title: Shear strength and dilative characteristics of an unsaturated compacted completely decomposed granite soil
Authors: Hossain, MA
Yin, JH 
Keywords: Axistranslation technique
Completely decomposed granite
Dilation angle
Matric suction
Shear strength
Soil-water retention curve
Issue Date: 2010
Publisher: NRC Research Press
Source: Canadian geotechnical journal, 2010, v. 47, no. 10, p. 1112-1126 How to cite?
Journal: Canadian geotechnical journal 
Abstract: Shear strength and dilative characteristics of a re-compacted completely decomposed granite (CDG) soil are studied by performing a series of single-stage consolidated drained direct shear tests under different matric suctions and net normal stresses. The axis-translation technique is applied to control the pore-water and pore-air pressures. A soil-water retention curve (SWRC) is obtained for the CDG soil from the equilibrium water content corresponding to each applied matric suction value for zero net normal stress using a modified direct shear apparatus. Shear strength increases with matric suction and net normal stress, and the failure envelope is observed to be linear. The apparent angle of internal friction and cohesion intercept increase with matric suction. A greater dilation angle is found at higher suctions with lower net normal stresses, while lower or zero dilation angles are observed under higher net normal stresses with lower suctions, also at a saturated condition. Experimental shear strength data are compared with the analytical shear strength results obtained from a previously modified model considering the SWRC, effective shear strength parameters, and analytical dilation angles. The experimental shear strength data are slightly higher than the analytical results under higher net normal stresses in a higher suction range.
URI: http://hdl.handle.net/10397/8535
ISSN: 0008-3674
DOI: 10.1139/T10-015
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