Stress-strain behavior and shear strength of unsaturated residual soil from triaxial tests
Nyunt, T. T.
Leong, Eng Choon
Date of Issue2012
Asia-Pacific Conference on Unsaturated Soils: Theory and Practice (5th : 2012 : Pattaya, Thailand)
School of Civil and Environmental Engineering
Multi-stage triaxial compression tests were performed on undisturbed samples of residual soils from Bukit Timah Granite formation in Singapore. Tests were carried out under two conditions, namely, consolidated undrained test (CU) (i.e. both pore-air and pore-water pressure were not allowed to drain during shearing) and constant water content test (CW) (i.e. drained pore-air but undrained pore-water condition during shearing). Stress-strain relationships and shear strength of unsaturated soils were studied at different initial matric suctions of 50 kPa, 100 kPa, 200 kPa, and 400 kPa, by performing CU and CW tests. The variations of matric suction during shearing at two different test conditions (CU and CW tests) are also presented. From the experiments, it was observed that the stress-strain relationship from CU test is less stiff than that from CW test. A single relationship of total cohesion intercept with matric suction was obtained from CU and CW tests.
© 2011 Kasetsart University. This paper was published in Asia-Pacific Conference on Unsaturated Soils: Theory and Practice and is made available as an electronic reprint (preprint) with permission of Kasetsart University. The paper can be found at the following official DOI: [http://www.unsat.eng.ku.ac.th/Proceeding/index.html]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.