Abstract
The main objective of this work was to experimentally investigate the influence of key environmental factors, including compaction-induced matric suction and confining pressure, on small-strain stiffness properties of partially saturated sandy and clayey soils using the pressure plate, resonant column, and bender element testing techniques. To achieve this goal, a comprehensive series of resonant column (ASTM D 2325-68), bender element (ASTM C 778), pressure plate (ASTM D 4015-92), and filter paper (ASTM D 5298) tests were conducted on several identically prepared specimens of loose, poorly graded sand (SP) and compacted, high plasticity clay (CH) subject to different compaction-induced (post-compaction) suction and confining stress states prior to resonant column and bender element testing. Compaction-induced suctions in all specimens were assessed prior to testing via a full set of previously calibrated soil- water characteristic curves (SWCC). Compaction-induced matric suction was found to exert a significant effect on the small-strain stiffness response of partially saturated SP and CH soils both from bender element and resonant column testing techniques.
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