Abstract: This paper briefly introduces the screw anchor technology, its application and its advantages. The pullout capacities of both shallow and deep anchors are also provided in this paper. These formulas were applied in designing the reaction for a static plate load testing program at a collapsible loess site treated by the dynamic compaction. The soil parameters used in the pullout predictions were obtained from the test boring information and laboratory test results. The predicted values for both single and double anchors were verified with the onsite pullout test results. So far, the screw anchors has successfully provided reactions for more than 800 static plate loading tests.

Key words: screw anchor, static plate load test, reaction device