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SIMPLE SHEAR LOADING RESPONSE OF UNDISTURBED AND RECONSTITUTED SILT
Session: Laboratory Testing I / Essais en laboratoire I
Achala Soysa, University of British Columbia (Canada)
Dharma Wijewickreme, University of British Columbia (Canada)
The mechanical behavior of relatively undisturbed low plastic natural silt was investigated using monotonic and cyclic constant volume direct simple shear testing for comparison with that derived from reconstituted specimens prepared from the same material. Natural silt, retrieved from a deltaic deposit located within the Lower Mainland of British Columbia, Canada were used for the study. Reconstituted specimens were prepared using a method of slurry deposition. During monotonic shear loading, reconstituted specimens exhibited slightly higher shear strength than that of undisturbed specimens. In cyclic direct simple shear tests, all reconstituted specimens displayed higher rate of strain accumulation and pore water pressures development compared to those observed for relatively undisturbed specimens. It appears that the combination of competing effects arising from void ratio and particle structure contribute to the shear behavior of observed at a given confining stress.
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