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ASSESSMENT OF COMPATIBILITY BETWEEN EXISTING LIQUEFACTION CHARTS IN EASTERN REGIONS OF NORTH AMERICA
Session: Problematic Soils and Ground Improvement I / Sols problématiques et amélioration du comportement I
Mourad Karray, Université de Sherbrooke (Canada)
Mahmoud Nasser, Université de Sherbrooke (Canada)
Mohamed Chekired, IREQ (Canada)
A comprehensive set of seismic (regular and irregular) loading tests on granular soil samples have been conducted using the new combined triaxial simple shear (TxSS) apparatus in order to evaluate the applicability/performance of the available seismic chart used in Eastern regions of North America and in Eastern Canada in particular. The TxSS system consists of a simple shear apparatus incorporated in a triaxial cell for the measurements of dynamic characteristics of soil samples. With TxSS, it is possible to conduct simple shear tests under control confining pressure, undrained conditions, and using arbitrary seismic loadings. In this study, different granular soil samples extracted from different sites in Québec are subjected to seismic loading obtained from response analyses using the computer code, FLAC on soil deposits subjected to earthquakes compatible and incompatible with the Eastern seismicity. The experimental and the computed results are compared, and the comparison confirmed the accuracy and the reliability of the TxSS test results as well as the adopted numerical model, and demonstrated that liquefaction charts used in the Eastern regions of North America, based on traditional tests, should be revisited.
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