Comparison between theoretical and practical compression capacities of deep / long piles

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The British University in Dubai
The rate of build of high-rise buildings has accelerated rapidly, especially in the Arabian Gulf, over the last few decades, due to rapid urbanization and significant improvements in the field of the high-rise construction and technology. Many challenges were faced by the engineers in the design and construction of such buildings. One of the major challenges was the foundation systems, which are required to ensure the stability of the buildings. The common type of foundation system which is used in case of high- rise buildings is piles foundation system. In the most standards and codes of practice such as British Standard and ASTM, the piles specifications and recommendations are stated for short piles which has a maximum depth range between 18.0 to 20.0 m. Theoretical equations for pile design, charts and different soil factors and parameters are based on old studies of short piles behavior. In this research, a comparison was conducted between the theoretical pile compression capacity which is calculated from the theoretical equations and the practical pile compression capacity which is derived from the results of pile’s static load test. The study covered three different cases of bored piles constructed in U.A.E especially in Dubai. The piles used in this research have a depth ranging from 30.0 to 65.0 m. This type of piles is classified in this research as long or deep piles. A finite element model of each pile was modeled by using PLAXIS 2D software, to compare the practical and theoretical piles capacities. It was found that the theoretical compression pile capacity is 60 to 70% of the practical pile capacity with the same specifications (pile diameter and pile depth). As a conclusion of the results, the theoretical equations which are used to calculate the pile compression capacity can be improved to give results very near from the practical condition.
high-raise buildings, long piles, PLAXIS 2D, piling equipment