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EVALUATION OF DSS TEST RESULTS ON GRANULAR SOILS BASED ON TXSS RESULTS
Session: Laboratory Testing II / Essais en laboratoire II
Mahmoud Hussien, Université de Sherbrooke, Sherbrooke (Canada)
Mourad Karray, Université de Sherbrooke, Sherbrooke (Canada)
Mohamed Chekired, Hydro-Québec (Canada)
Although DSS tests represent quite well the cyclic shear mode of the soil under seismic loading conditions, one of its main flaws is its lack to monitor the change of confining stress of the tested specimen. Accordingly, the complete stress state of the soil sample is typically not defined, and in turn, this limits the use of DSS test results, in particular, for the calibration of soil constitutive models. In this paper, the new combined triaxial simple shear (TxSS) apparatus is employed to evaluate DSS test results on granular soils. The TxSS system consists of a direct simple shear system incorporated in a typical triaxial cell for the purpose of applying and monitoring the lateral confinement as well as the pore water pressure generation during strain-controlled loading. Parallel monotonic and cyclic TxSS tests on different saturated Baie-Saint-Paul sand specimens with (DSS) and without (TxSS) stacks of annular plates at different confining pressures and draining conditions were conducted to evaluate the performance of DSS results against the results obtained from the TxSS. The results corroborate the practical recommendations that stress the use of DSS to investigate the shearing behavior of sands at small strains, but less so for evaluating large-strain behavior.
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