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http://dx.doi.org/10.7843/kgs.2010.26.6.21

The Unsaturated Stress Strain Behavior of CDG (Completely Decomposed Granite) Soils  

Ham, Tae-Gew (Daewoo Engrg.)
Ahn, Tae-Bong (Dept. of Railroad and Civil Engrg., Woosong Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.26, no.6, 2010 , pp. 21-28 More about this Journal
Abstract
Decomposed granite soil is the most common type of soils. The measurement of the stress-strain-strength behavior of anisotropic decomposed granite soils is very important for the deformation and stability analysis of slopes, retaining walls, excavations. A series of unsaturated-drained triaxial compression tests were performed to know unsaturated strength properties. The sample had three different angles of the axial (major principal) direction to the sedimentation plane (compaction plane): 0, 45 and 90 degrees. The compression strain of specimens subjected to an isotropic compression was strongly influenced by the sedimentation angle. In addition, the time dependence was independent of the sedimentation angle in relation to the deformation behavior during the secondary compression process. The effect of the sedimentation angle on the triaxial compression strength and deformation was clearly shown with low confining stress. The effect of the sedimentation angle on the compressive strength and deformation was more evident in saturated specimens. A new method of predicting the shear strength of unsaturated decomposed granite soils, considering compaction angles, was proposed.
Keywords
Anisotropy; Decomposed granite soils; Unsaturated strength; Sedimentation angle;
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