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Erschienen in:
2017 | OriginalPaper | Buchkapitel
Stress Paths on Displacement Piles During Monotonic and Cyclic Penetration
verfasst von : Jakob Vogelsang, Gerhard Huber, Theodoros Triantafyllidis
Erschienen in: Holistic Simulation of Geotechnical Installation Processes
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Abstract
In this contribution, a study on the behavior of instrumented model piles in slow, cyclic penetration tests using a cylindrical full model test set-up is presented. The tests are performed under 1g-conditions in a uniform medium sand. A hydraulic driving system enables a displacement controlled penetration similar to the pile motion during vibro-driving at strongly reduced frequency. The pile instrumentation allows the measurement of shaft and tip force during the driving process. Systematic variation of soil density and displacement amplitude reveals the occurrence of typical stress paths of vibratory pile penetration. By comparison with results from monotonic and vibratory penetration tests, the influence of the penetration mode is deduced. Results from FE simulations applying a hypoplastic soil model help to illustrate the strong requirements and the considerable challenges to obtain realistic simulations of cyclic pile penetration processes. Some hints towards a further numerical modeling of the tests are given.