Unsaturated shear strength of a silty sand

作者：Schnellmann Reto; Rahardjo Harianto^*; Schneider Hans R

来源：Engineering Geology, 2013, 162: 88-96.

DOI：10.1016/j.enggeo.2013.05.011

• 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.

• 出版日期2013-7-25