Behaviour of a Strip Footing Near Slope Crest Under Vertical Cyclic Loading

摘要

In this paper, laboratory model tests for determining the changes in ultimate bearing capacity and permanent deformation behaviour of a strip footing near the crest of a slope at varying slope angles due to cyclic loading are presented. The change in bearing capacity due to cyclic loading was determined by first performing a monotonic load test on the model footing immediately upon completion of the cyclic loading. This bearing capacity was then compared with a reference capacity at the same slope angle tested without any cyclic load. The relationship between permanent deformation and the number of load cycles for a particular cyclic load amplitude were also investigated for each type of model slope and discussed in this paper. Both the vertical and lateral permanent deformations of a model footing near the crest of a steep slope were found to be greater than those of a footing resting on a mild slope. Improvements in bearing capacity and soil stiffness were also noticed for both mild and steep slopes after cyclic load applications. Also, the lateral movement of this model footing in the direction of the slope was found to be significantly reduced due to the application of cyclic loading.