Experimental Validation of Suction Stress Characteristic Curve from Nonfailure Triaxial K-0 Consolidation Tests

Title
Experimental Validation of Suction Stress Characteristic Curve from Nonfailure Triaxial K-0 Consolidation Tests
Author(s)
오세붕Ning Lu[Ning Lu]김태경[김태경]이영휘
Keywords
UNSATURATED SOIL; SHEAR-STRENGTH; FRAMEWORK; MODEL
Issue Date
201309
Publisher
ASCE-AMER SOC CIVIL ENGINEERS
Citation
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, v.139, no.9, pp.1490 - 1503
Abstract
In recent years, the suction stress characteristic curve (SSCC) has been shown to represent a key constitutive relationship for defining effective stress in variably saturated soils. The SSCC can be deduced either from shear strength tests under variably saturated conditions or from soil water retention tests. This paper provides an alternative way to obtain the SSCC by conducting nonfailure K-0 consolidation tests. Multiple remolded specimens from two different granitic residual soils, a silty sand (SM) and a clayey sand (SC), were evaluated in suction-controlled triaxial tests under K-0 conditions. The results from these tests show that the stress paths for remolded specimens with different initial suction values differ during K-0 consolidation when plotted in terms of the net normal stress, but follow a single path when plotted in terms of the effective stress defined using the SSCC. This observation confirms the validity of the effective stress principle before failure. Further, the results of the shear strength tests under different matric suctions show that the failure envelope can be uniquely defined by the effective stress representation, a reconfirmation of the validity of the effective stress principle in describing the shear strength behavior of soils. The results obtained from the K-0 consolidation tests also reveal that K-0 (or the horizontal to vertical stress ratio) defined by effective stress is invariant to matric suction, whereas K-0 defined by the total stress varies greatly with matric suction. These results provide a further confirmation of the validity of the effective stress principle. Because the SSCCs deduced independently in this study from shear strength tests, soil water retention tests, and K-0 consolidation tests compare favorably with each other, the SSCC-based effective stress can be used to describe the consolidation and shear strength behavior of unsaturated soils. (C) 2013 American Society of Civil Engineers.
URI
http://hdl.handle.net/YU.REPOSITORY/29030http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000880
ISSN
1090-0241
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공과대학 > 건설시스템공학과 > Articles
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