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EFFECT OF SOIL STRUCTURE ON IN-SITU FIELD VANE AND SEISMIC PIEZOCONE TESTS IN CHAMPLAIN CLAY
Session: In Situ Testing and Instrumentation I / Essais in situ et instrumentation I
Mark Styler, ConeTec Investigations, Ltd. (Canada)
Will McQueen, ConeTec Investigations, Ltd. (Canada)
John Howie, University of British Columbia (Canada)
In this paper we report on the interpretation of field vane shear testing at the National Canadian Geotechnical Research site in Gloucester, Ontario. Previously published investigations of the Champlain/Leda clay that underlies this site have observed cemented particle aggregates. We examined three different techniques for estimating the yield-stress ratio from field vane test results in the Champlain/Leda clay that underlies this site. We observed that all three vane interpretation methods provided similar results that were larger than laboratory reported values. We performed a seismic piezocone test and calculated the ratio of the shear stiffness to net tip resistance. For this soil, it appears that strength is a better indication of cemented particle bonds than stiffness.
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