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The fundamental behaviour of displacement screw piling augers
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However, investigations into fundamental auger mechanics have been almost exclusively directed towards CFAs. The aim of the current investigation is to study the behaviour of displacement screw piling augers in sands. In particular, the relationship between soil transport, soil displacement, radial stress and installation forces has been investigated. This thesis presents a new theoretical model to predict the soil transport, soil displacement and installation torque characteristics of screw piling augers with variable geometry.
The performance of the model has been verified by comparison with 1:4 scale model tests performed on three different displacement screw piling augers. The physical soil transport and displacement fields have been observed by installing augers into dyed, layered sands and later exhuming the augers. A second series of tests was also performed to compare the installation parameters (torque, penetration rate and rotational speed) and radial stresses acting on the auger during installation.