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Two series of model experiments are reported in which circular plate anchors, 25 mm diameter, buried in beds of dense dry sand within a container 0.770 X 0.770 x 0.500 m, have been tested at effective stress levels appropriate to field anchors.These stress levels have been obtained by evacuating the void space within the container which was sealed at the surface by a flexible membrane and exposed to external atmospheric pressure or by the action of inertial accelerations generated within a centrifuge.Load-deflection data are presented for vertical anchor plates pulled towards the boundaries of the container together with changes in normal pressure distribution at these boundaries for a range of initial anchor positions.Flexibility of the container is shown to have a critical effect on the results from the evacuated models.The centrifuge models in which boundary deflection is restrained are shown to give more realistic results and using this technique significant changes in anchor pull-out load have been measured for variations in anchor inclination from horizontal to vertical. The pull-out loads have generally been lower than those predicted by other researchers.

Model ground anchors under gravitational and centrifugal accelerations