SYMPOSIA PAPER Published: 01 January 1979
STP33750S

Field Evaluation of Caisson-Shale Interaction

Source

Load tests were conducted on ten full-sized cast-in-place drilled caissons (bored piles, drilled shafts) of varying diameter. Three caissons were tested to evaluate end-bearing on the surface of fissile shale; five caissons were tested to evaluate side shear of shale sockets; one caisson was tested to evaluate end-bearing below weathered shale; and one caisson was tested to evaluate side shear in soil. Nine of the shale-bearing caissons tested exhibited subgrade failure, observed as excessive settlement, while the remaining shale-bearing caisson, drilled to end-bearing below the weathered shale, failed by shearing of the concrete shaft. The end-bearing test values exceed commonly employed empirical design values by factors ranging from 3 to 23. The shale sockets supported loads of at least one-third of and in some cases exceeding the ultimate end-bearing load.

Author Information

Spanovich, M
Engineering Mechanics, Inc., Pittsburgh, Pa.
Garvin, RG
Engineering Mechanics, Inc., Pittsburgh, Pa.
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Details
Developed by Committee: D18
Pages: 537–557
DOI: 10.1520/STP33750S
ISBN-EB: 978-0-8031-4740-9
ISBN-13: 978-0-8031-0291-0