Advanced Laboratory Investigation of Axial Cyclic Loading in Silica Sands
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Abstract
Description
This paper describes the global behaviour of and local stress conditions
applying to highly instrumented cyclic laboratory model displacement pile tests
conducted in a calibration chamber on medium dense Fontainebleau NE34 sand.
The instrumentation provided measurements of the contact stresses on the jacked
pile shaft and the local vertical, radial and circumferential stresses in the
surrounding soil mass, in tests involving a range of cyclic load amplitudes. The
patterns of effective stress developing on and around the pile shaft are described.
The data obtained are interpreted by reference to cyclic soil element tests
conducted on the same soil, as described in the parallel investigation by
Aghakouchak et al (2015), reported in the same symposium. The calibration
chamber experiments offer a comprehensive understanding of the cyclic
degradation processes, and provide key information for improving the design of
piled foundations under cyclic loading.
Keywords
Cyclic loading, Pile–soil interface, Calibration chamber, Sand, Local stresses