期刊
ENGINEERING GEOLOGY
卷 162, 期 -, 页码 88-96出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.enggeo.2013.05.011
关键词
Direct shear test; Unsaturated shear strength; Shear strength prediction; Matric suction
Series of single stage, consolidated drained direct shear tests under different net normal stresses and matric suctions were carried out to evaluate the unsaturated shear strength behavior of a silty sand. A back pressure shear box was used to measure and control pore-air and pore-water pressures. The experimental data show that matric suction increases shear strength of the soil significantly following a highly non-linear relationship. An increase in net normal stress results in a higher shear strength and the shearing behavior changes gradually from a peak shear strength followed by a strain-softening behavior to a strain-hardening behavior. A comparison between experimental shear strength measurements and predicted unsaturated shear strength values was made and the results are presented in the paper. (C) 2013 Elsevier B.V. All rights reserved.
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