Abstract
This experimental program studies the behavior of groups of helical earth anchors embedded in granular soil. This was performed by the use of laboratory and field anchor‐pullout tests. A literature review of existing anchor‐capacity theories and related material is presented. Laboratory and field group‐anchor pullout tests were conducted to study the mutual interaction behavior of the individual anchors. Results indicate that the group pullout capacity is a function of the horizontal spacing between anchors and that the exterior anchors in a closely spaced group carry the greatest proportion of the load at impending failure. Empirical equations were developed to predict the pullout capacity of groups of anchors.
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