DYNAMIC PULLOUT RESISTANCE OF ANCHORS IN SAND.

The resistance of buried anchors to dynamic loading was investigated through the use of model anchors tested in laboratory conditions. The soil used for the model was a uniformly graded dry sand placed at a uniform relative density. Three inch and five inch diameter half anchors were tested at three depths of embedment. The sand was placed in layers of alternating color and the half anchors were placed adjacent to a transparent side of the test container. A high speed camera was used during dynamic testing to record the anchor movement and delineate the failure surface shape for each anchor size and depth of embedment. The resulting failure surfaces were compared to those generated by static loading for the same embedment depth and anchor diameter. Refs.