Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)
11 Construction Debris Landfill Offers Challenge for Foundation Support
J.H. Gould; RUST International Corporation, Birmingham, Ala. T.F. Mullin; Dames & Moore, Boca Raton, Fla.
A $250 million resource recovery facility was constructed at a site containing limestone borrow pits backfilled with debris from construction demolition. The debris and underlying deposits of loose to medium dense sands below the shallow groundwater level required that most of the structures be pile supported. In preparation for the commencement of construction, a preliminary geotechnical exploration relating to the specific locations proposed for major structures was commenced in late 1988. The preliminary exploration was followed by a more extensive exploration during the winter of 1989. A thorough evaluation of pile foundation alternatives was made, and the following pile types were tested during the summer of 1989: 1) open-end, high yield strength steel pipe pile; 2) square, precast, pre-stressed concrete pile; 3) square, Balken precast concrete pile; and 4) augered pressure grouted (APG) pile. The portion of the APG pile extending through the debris was cased. The APG pile was selected as the most economical, and 1,913 high capacity piles with an average length of 24.6 m (80.8 ft) were installed. Special procedures were developed to install the casing to depths as great as 10.7 m (35 ft). Even after initial modifications to equipment and installation procedures, numerous problems were encountered and overcome concerning installation of the piles as designed. It is the authors' opinion that none of the other pile types considered could have been installed as economically and timely or with less difficulty.
|article #452; publication #37 (IC-1991-IT)|