9. Field experiments with instrumented piles in sand and clay
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Published:1992
R. J. Jardine, A. J. Bond, B. M. Lehane, 1992. "9. Field experiments with instrumented piles in sand and clay", Piling European practice and worldwide trends: Proceedings of a conference organized by the Institution of Civil Engineers, and held in London on 7–9 April 1992, Institution of Civil Engineers
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The Paper describes the results of instrumented pile tests in a heavily overconsolidated clay and a normally/lightly-overconsolidated sand. Both soils dilate when sheared. Measurements of radial effective stress (σ'r) and shear stress (τrz) in the two soils are compared, and show many interesting similarities and differences. Failure of the piles during slow loading was controlled by an effective stress failure criterion, τrz = σ'rtan δ. The angle of interface friction (δ) was essentially constant along each pile, but σ'r) (and hence τrz) decreased with increasing distance above the pile tip. The value of δ depended strongly on soil type, and, in the clay, on the method and speed of pile installation.
INTRODUCTION
SITE CONDITIONS
PILE TESTING ARRANGEMENTS
INSTRUMENTATION
EQUALIZATION
LOADING TESTS
DISCUSSION
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
