Prediction of total heave of a slab-on-grade floor on Regina clay

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Geotechnical Journal, 20, 1, pp. 69-81, 1983 The prediction of total heave on a slab-on-grade floor on regina clay Yoshida, R. T.; Fredlund, D. G.; Hamilton, J. J. Reprinted from Canadian Canadian Geotechnical JournalThe prediction of total heave of a slab-on-grade floor on Regina clay S veral analytical methods for the prediction of total heave of desiccated, expansive soils have been proposed for various geo raphic regions. The proposed method herein is based on a general theory for unsaturated soil. The in-situ stress conditions, as a sessed from the corrected swelling pressure and the required soil moduli, are deduced from the constant volume oedometer test. iVtrification of the proposed method was accomplished using data accumulated from the m~nitoring of movements of a floor slab n a light industrial building in north-central Regina, Saskatchewan. A leak in a water line buried under the floor slab resulted in a f, aximum heave of about 106 mm. Of the three final pore-water pressure distributions assumed, the one where pressure is consbnt with depth and equal to atmospheric pressure appears to be representative of the field conditions corresponding to the max'mum measured heave. The measured heave represents 89% of the predicted heave for the zero pore-water pressure t distvbution. It is concluded that the proposed method of analysis, based upon a general theory for unsaturated soils, provides a practical method to accwately assess total heave. Plusieurs mCthodes analytiques de prkdiction du soultvement total des sols expansifs dtssCchCs ont Bt C proposkes pow diffkrentes rkgions gkographiques. La mCthode proposte ici est fondCe sur une thkorie gtnCrale des sols non saturCs. Les conditions de constraintes en place, telles que dtduites de la pression de gonflement corrigke, et les modules du sol necessaires sont ddduits d'un essai oedomktrique A volume constant.La ~Crification de la mCthode proposCe a Ct C faite A partir des donnCes accumulCes 101-5 de I'obsemation d'une dalle de plancher dans un bltiment industriel lCger dans le centre-nord du RCgina, Saskatchewan. Une fuite dans une conduite d'eau enterrCe sous cette dalle a provoquC un soultvement maximum de 106 mm. Des trois distributions finales de pression interstitielle suppodes, la pression interstitielle constante avec la profondeur et Cgale A la pression atmosphCrique semble Ctre representative des conditions du terrain correspondant au soultvement maximum. Le ...