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This paper presents some measurements of the distribution of load transfer from the shafts of instrumented, bored, cast-in-situ concrete piles formed in London clay using a limited number of installation techniques. The measurements were included in a study of whether the use of bentonite slurries to stabilize open bore holes prior to concreting inhibits the development of friction on the shafts of piles in stiff clays. The instrumentation consisted of rod extensometers of various lengths and vibrating-wire gages clamped to the reinforcing cages. Devices attached to the bottom of each reinforcing cage prevented the development of any bearing forces at the pile bases. A method of correcting the extensometer observations for bending of the laterally unsupported length of shaft cased through fill is described, and the results are compared with a finite element analysis of the pile-soil system.
bored pile, clay, friction, load test, settlement, instrumentation, finite element method, stress distribution
Principal scientific officer, Building Research Station, Garston, Watford