Abstract
ABSTRACT Screw micro-piles are becoming progressively popular for inherent advantages and installation convenience. Their load-transfer technique and failure mechanism are complex and they bear more loads compared to the conventional piles, due to soil-thread interactive shear and bearing stresses. Available knowledge on performance of such piles is limited. The authors conducted a series of small-scale model tests on pull-out and lateral load-displacement characteristics of screw micro-piles embedded in soft cohesive soil. A sophisticated test set-up is developed to carry out the experiments under controlled conditions. The tests are followed by three-dimensional finite-element modeling by ABAQUS. The numerical output data closely matched with experimental results. Utilizing the finite-element model, interface shear stress distributions, load-transfer mechanism and failure envelop development are studied. The pile capacities are found to be influenced by different pile parameters, like pitch, embedded length, diameter, thread angle, etc. A set of important conclusions are drawn from the entire study.
Published Version
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