Abstract
The vertical uplift resistance of shallow strip and circular plate anchors buried horizontally in a two layered sand has been determined by using the upper bound theorem of limit analysis. Uplift factors f y and f q due to the effects of soil unit weight and surcharge pressure, respectively, have been established. For a given thickness of the two layers, the uplift factor f y is found to be comparatively greater when the anchor is embedded in dense sand underlying a loose sandy layer. However, the factor f q remains unaffected by the layers' relative positions. As compared to available experimental results, the theory provides a slight overestimation of the uplift resistance especially for greater embedment ratios.
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