DFI Journal - The Journal of the Deep Foundations Institute

Volume 9, Issue 1, January 2015
DOI: 10.1179/1937524715Z.00000000024

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Static tests on instrumented piles affected by residual load (RESEARCH PAPER)

B. H. Fellenius

Abstract


Analysis of results from a static loading tests on an instrumented pile usually assumes that the gage determined loads represent the true loads in the test pile. However, more often than not, residual load will have been present in the pile at the start of the static test. Disregarding these in the analysis will misrepresent the load–movement response and the loads determined from the strain–gage instrumentation, as presented in the paper. The results of three static loading tests: a 400 mm diameter, 45 m long, concrete filled, closed toe, steel pipe pile driven in soft clay, a 460 mm diameter, 22 m long bored pile (screw pile) in silt and sand and stiff clay, and a 600 mm diameter, 15 m long, jacked-in concrete pile in a residual, dense, silty sandy weathered sandstone. The measured load distributions are corrected for residual load, demonstrating the interdependence of the distributions of ‘‘False’’ and ‘‘True’’ distributions of load.

Keywords:
static loading tests, residual load, instrumented piles, load distribution, full scale-test, driven precast concrete pile, driven steel pipe pile, jacked-in cylinder pile