Physical and geotechnical properties of Urmia peat

K. Badv, T. Sayadian

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Embankments and Dams

ABSTRACT: The Urmia-Tabriz Shahid Kalantari highway embankment in Iran experienced more than one meter of settlement due to the consolidation of the peaty foundation (Urmia peat). The consolidation and direct shear tests were conducted on samples of peat and the relationship between the key mechanical and physical properties of peat was investigated. The results show that the amount of organic matter (degree of decomposition) and initial void ratio are the two important factors which control the mechanical behaviour of Urmia peat. Also it was found that the C/Cc concept of compressibility is applicable to Urmia peat.

RÉSUMÉ: Le remblai autoroute de Shahid Kalantari (Urmia à Tabriz) en Iran a connu plus d'un mètre de règlement en raison de la consolidation de la fondation tourbé (tourbe Urmia). Les essais de cisaillement direct et de consolidation ont été effectués sur des échantillons de tourbe et de la relation entre les principales propriétés mécaniques et physiques de la tourbe ont été étudiées. Les résultats montrent que la quantité de matière organique (degré de décomposition) et indice de vide initial sont les deux facteurs importants qui contrôlent le comportement mécanique de la tourbe Urmia. En outre, il a été constaté que le C/Cc notion de compressibilité est applicable à la tourbe Urmia.

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