Estimation of Champlain clay hydraulic conductivity from pressure data obtained during piezometer grouting

Vahid Marefat

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: GROUNDWATER AND HYDROGEOLOGY - I Groundwater Hydraulics

ABSTRACT: The early time pore pressure response of vibrating wire pressure transducers during piezometer grouting was used to estimate the hydraulic conductivity, K, for the Lachenaie clay deposit. The assessment of clay K is important to assess the vulnerability of groundwater from surficial contamination. From a geotechnical viewpoint, K is an important factor in problems regarding consolidation and slope stability issues in clay. The K value was between 1×10-10 and 6×10-10 m/s according to the analysis of the early pore pressure response of piezometers during piezometer grouting. The obtained values are in good agreement, at the lower bound, with previous in-situ results obtained from usual in-situ tests. The early time pore pressure due to piezometer grouting was dissipated in less than one day. This method yields a quick estimation of clay aquitard hydraulic conductivity, which can be used in conjunction with other methods (e.g., pulse test) for site characterisations and engineering applications.

RÉSUMÉ: Leur réponse immédiate en pression interstitielle pendant le scellement a été utilisée pour estimer la conductivité hydraulique, K, K est Du point de vue géotech-nique, K est un paramètre important dans les problèmes de consolidation et de stabilité de pentes des argiles. La valeur de K était entre 1×10-10 et 6×10-10 scellement. Les valeurs obtenues concordent bien avec la zone basse des valeurs obtenues par les essais usuels in une estimation rapide de la e.

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