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SOME INITIAL EXPERIMENTAL FINDINGS ON THE INFLUENCE OF MODE OF SHEAR ON THE MONOTONIC SHEAR RESPONSE OF RECONSTITUTED SILTS
Session: Laboratory Testing I / Essais en laboratoire I
Daniel Barnes, University of British Columbia (Canada)
Priyesh Verma, University of British Columbia (Canada)
Dharma Wijewickreme, University of British Columbia (Canada)
An experimental research program has been undertaken to investigate the influence of mode of shear on the monotonic shear response of relatively low plastic reconstituted silt obtained from a soil deposit located in Kamloops, British Columbia, Canada. The consolidated monotonic shear response of the reconstituted silt under undrained triaxial compression, undrained triaxial extension, and constant volume direct simple shear loading conditions were compared. In the triaxial tests, the silt specimens were reconstituted from an initial slurry state and then consolidated to three target effective confining stress levels. At all confining stress levels, the undrained shear strength observed under triaxial compression was observed to be approximately 20% greater than that noted from triaxial extension tests. The undrained shear strength measured from the direct simple shear loading at an effective confining stress level of 100kPa was observed to be similar to that measured in the triaxial extension test. This limited test data suggests similar trends to what has been observed for Ko - consolidated low plastic soft clays.
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