الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
A lot of the old low-rise buildings at Port-Said city has been replaced by modern much higher buildings in the last few decades. As the city is located to the east in the vicinity of the Nile Delta, many settlement problems were reported due to the thick clay layers, which extend deeply beneath the ground surface. Rafts were successfully used in order to diminish the settlement effects at Port-Said. However, the challenges arising from the continual need for higher buildings necessitate the use of more reliable and efficient foundation systems. Piled raft systems can provide better solutions as they can mobilize much higher soil resistance.
Based on the Egyptian code and realistic site conditions and soil properties, the behavior of piled raft in Port Said soil was investigated in this thesis. Various load-settlement models and different calculation methods were considered, including the simple assumption model, Winkler’s model, and more sophisticated continuum models. Both elastic and rigid raft behaviors were analyzed. Firstly, the behavior (based on the Egyptian code) of a single pile in Port Said clay was compared with its behavior resulting from the hyperbolic function model, to assess the validity of code for pile calculations in Port Said area. Then a simplified case of circular piled raft was studied for demonstration. A parametric study was carried out for more complicated piled raft systems to investigate the effective parameters; namely: pile length, pile diameter, pile spacing, type of load-settlement model, and type of calculation method. The study showed that the Egyptian code needs much more investigations to assess its validity for piled raft in Port-said soil.