The Air Force Memorial is a national place of pride, reverence, and remembrance located just outside the Nation’s Capital. It is dedicated to the Men and Women of the United States Air Force and its Heritage Organizations. The memorial is located on a promontory which overlooks the Pentagon and is adjacent to Arlington Cemetery.
Soil conditions for the foundation at the memorial site varied from loose sandy fills and very soft clays to hard consolidated marine clays. Borings typically caved in the fills at five to six ft in depth. The loading for structures, walls and benches at the site varied from 110 kips to 1,800 kips for the larger granite steps.
Due to the variable and caving soil conditions Impact Pier elements were selected to support all structures with the exception of the spires. The benefit of the Impact Pier elements is that they can be installed in a variety of soil conditions including caving soils. The Impact Pier steel mandrel penetrated the caving soils and maintained the hole while aggregate was rammed with the mandrel head to form the Impact Pier elements.