The prediction of total heave of a slab-on-grade floor on Regina clay

R. T. Yoshida, D. G. Fredlund, J. J. Hamilton
1983 Canadian geotechnical journal (Print)  
Several analytical methods for the prediction of total heave of desiccated, expansive soils have been proposed for various geographic regions. The proposed method herein is based on a general theory for unsaturated soil. The in-situ stress conditions, as assessed from the corrected swelling pressure and the required soil moduli, are deduced from the constant volume oedometer test. Verification of the proposed method was accomplished using data accumulated from the monitoring of movements of a
more » ... of movements of a floor slab in a light industrial building in north-central Regina, Saskatchewan. A leak in a water line buried under the floor slab resulted in a maximum heave of about 106 rnrn. Of the three final pore-water pressure distributions assumed, the one where pressure is constant with depth and equal to atmospheric pressure appears to be representative of the field conditions corresponding to the maximum measured heave. The measured heave represents 89% of the predicted heave for the zero pore-water pressure distribution. It is concluded that the proposed method of analysis, based upon a general theory for unsaturated soils, provides a practical method to accurately assess total heave. Plusieurs mkthodes analytiques de prkdiction du soulkvement total des sols expansifs dCssCchCs ont Ct C proposCes pour diffkrentes regions giographiques. La mCthode proposCe ici est fondCe sur une thkorie g6nCrale des sols non saturts. Les conditions de constraintes en place, telles que dCduites de la pression de gonflement corrigke, et les modules du sol nkcessaires sont dCduits d'un essai oedomktrique i volume constant. La verification de la mCthode proposCe a Ct C faite i partir des donnCes accumulCes lors de l'observation d'une dalle de plancher dans un bkiment industriel lCger dans le centre-nord du Regina, Saskatchewan. Une fuite dans une conduite d'eau enterrCe sous cette dalle a provoquC un soulkvement maximum de 106 mm. Des trois distributions finales de pression interstitielle supposCes, la pression interstitielle constante avec la profondeur et Cgale i la pression atmosphCrique semble &re reprksentative des conditions du terrain correspondant au soulkvement maximum. Le soulkvement mesurk reprksente 89% du soulkvement prCdit pour une distribution nulle des pressions interstitielles. On conclue que la mCthode d'analyse proposCe, fondCe sur une thCorie gCnCrale pour les sols non saturCs, constitue une mCthode pratique pour Cvaluer le soulkvement total de f a~o n precise. [Traduit par la revue] Can. Geotech.
doi:10.1139/t83-008 fatcat:vao5vi4ktrfyxizetfrvq2kzjq