Consolidation behaviour of clay slurry and lumpy soil as observed from model tests

B. Li, S.F. Wu, J. Chu, K.P. Lam

Dans les comptes rendus d’articles de la conférence: 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: Ground Improvement/Remediation

ABSTRACT: Lumpy soil is a common waste material from dredging or excavation and is often used as backfilled material. Lumpy soil has both intra-lumpy porosity (within the soil lumps) and inter-lumpy porosity (in between the soil lumps). Thus, consolidation behaviour can be quite different from that of normal soil. In this paper, the consolidation behaviour of both clay slurry and lumpy soil under vacuum preloading as observed from laboratory model tests is studied. Pore-water pressure distributions in the soil, ground settlement, and other soil properties were monitored during the experiments. The results indicate that lumpy soil induces large settlement and pore pressure dissipation at the initial stage of loading and the rate of consolidation decreases dramatically after the inter-lumpy voids close up. In contrast, uniform marine clay experiences slower but consistent rate of consolidation. Under the same consolidation stress, lumpy soil ends up with a lower shear stress than marine clay. This may be because the overall void ratio of the lumpy soil is still higher than uniform soil after consolidation.

RÉSUMÉ: fréqeumment rencontré dans le dragage de sol en cours de construction, et usuellement utilisé comme le matériau pour remblayer ensuite. Comme le sol avec double porosité, qui a à la fois la -chargement à vide est idéale par rapport à la méthode de surcharge par remblayer pour la consolidation de boue de sol, qui est trop mou pour la -chargement , le présentés dans cet article.

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