Analysis of Large Diameter Bored Monopile under Static Axial Load
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Abstract
Large-diameter monopiles with a diameter exceeding 0.60 m provide optimized foundation solutions for rather heavy structures. Egyptian code practice applies the basic design equations or field data from SPT-N to calculate pile capacity. A case study of a full-scale in-situ pile loading test at the Cairo Monorail project has been carried out and the pile was constructed in dense sand soil. The present study focuses on modeling a field vertical loading test performed on a large 2.0m diameter pile using Plaxis 3D. A modified finite model is proposed in this study for the analysis of pile axial load capacity to investigate the soil-pile behavior in terms of skin friction and end bearing. The vertical load versus settlement curve for the single pile field test is compared with that obtained from the finite element model, showing fair agreement. Parametric studies have been conducted to investigate the optimum length of the pile and its effect on pile capacity. Accordingly, some correlations and appropriate constitutive relationships for an ultimate vertical load of bored large-diameter piles embedded in sandy soil are reported by changing the length (Li) of the pile. Also, the comparison between Chin and ECP methods is presented for estimating the ultimate capacity of the pile. The results show that the accuracy of Chin method is depended on the pile length and testing pile load also, the ultimate capacity of pile demonstrated from Chin method is overestimated by comparing its result by that calculated from ECP method.
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References
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