Lateral and uplift resistance of Geopier-supported footings
DOI:
https://doi.org/10.21703/0718-2813.2010.7.3720Keywords:
lateral and uplift loads, shallow foundations, compacted aggregate piers Geopier, full scale lateral and uplift load testsAbstract
This paper discusses the behavior of Geopier-supported shallow foundation systems when subjected to lateral and uplift (tensile) loads. Lateral and tensile loads are often applied to foundation systems when the supported structures are subject to wind or seismic events and also to lateral earth pressures. Geopier - supported shallow foundations provide resistance to lateral loads using mechanisms identical to those applicable to conventional shallow footings. These mechanisms include passive earth pressure adjacent to the footings and sliding resistance along the base of the footings. However, because of the high stress concentration to the Geopier elements and the high friction angle of the Geopier aggregate, greater resistance is achieved in comparison to a footing supported by soil not reinforced by Geopier elements. Uplift anchors are incorporated into Geopier elements to resist tensile loads. The anchors consist of a steel plate installed at the bottom of the piers and threaded bars connected to and extending from the embedded plate to the overlying footing. This paper describes methods used to design Geopier-supported footings to resist lateral and uplift load demands. Results of lateral and uplift loading tests using full-scale footing are also presented.
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