On the pullout of footings backfilled with cemented sand

L'Amante, D., Helinski, M., Richards, D.J., Lehane B, B.M. and Consoli, N. (2007) On the pullout of footings backfilled with cemented sand. 5th International Workshop on Applications of Computational Mechanics in Geotechnical EngineeringGuimaraes, Guimarães, Portugal. 31 Mar - 03 Apr 2007. pp. 331-339 .

Abstract

The kinematics of failure and the uplift response of shallow footings embedded in loose sand, as well as on layers of weakly to moderately cemented loose sands, when subjected to vertical pullout tests carried out on a drum centrifuge are discussed in this paper. The utilization of a cemented top layer increased uplift capacity and changed soil behavior to a noticeable brittle behavior. An attempt has been made to delineate the rupture surfaces of the shallow footings embedded in artificially cemented layers according to level of cementation. The mode of failure was also drastically affected according to the degree of cementation, varying from a vertical punching pattern for the uncemented loose sand to the development of fissures folllowed by small blocks for the weakly cemented sand (1% cement-q(u) = 25 kPa), formation of a rounded fissure with the incidence of encircle radial fissures for 3% cement (q(u) = 87 kPa) and finally formation of a few radial fissures starting at the center of loading giving rise to the formation of large blocks extending the failure to almost all the cement improved area for the moderately cemented (5% cement-q(u) = 365 kPa) sand.

This record has no associated files available for download.

Contributors

Download statistics