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http://dx.doi.org/10.7843/kgs.2011.27.1.041

Suction Stress Characteristic Curve before Failure in the K0 Consolidated Triaxial Tests for the Compacted Residual Soil  

Oh, Se-Boong (Dept. of Civil Engrg., Yeungnam Univ.)
Lu, Ning (Division of Engrg., Colorado School of Mines)
Song, Ha-Dong (Dept. of Civil Engrg., Yeungnam Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.27, no.1, 2011 , pp. 41-52 More about this Journal
Abstract
The hypothesis on effective stress of unsaturated soil is validated by $K_0$ consolidation results of triaxial tests for the compacted residual soil. The stress characteristic curve (SSCC) can describe unsaturated soil behavior on water contents, which was defined from shear strength or from soil water characteristic curves. In this study, it was found that the stress path of $K_0$ consolidation can also define the SSCC. The effective stress was defined by SSCC. $K_0$ paths for various matric suctions could be described as a unique line by effective stress. The measured values of $K_0$ were interpreted by effective stress as a constant with respect to matric suction. Since the SSCC from $K_0$ consolidation agrees with that from the shear strength, the SSCC from soil water retention curve could describe effective stress behavior consistently on both $K_0$ consolidation path and stress at failure. The effective stress based on SSCC can describe the entire unsaturated behavior from consolidation to failure.
Keywords
Consolidation; Effective stress; Suction stress; Unsaturated soils;
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