الفهرس 
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Abstract
The piled raft system is one of the most important systems in the last
decades. The purpose of this research is to check the application of
piled raft system in stiff clay as well as in soft clay after introducing
the available methods for analysis of piled raft system for different
case studies.
The methodology of analysis is the finite element method using
Plaxis 3D software implementing Mohr-Coulomb and Hardening
Soil constitutive models. The numerical model has been calibrated
using a well monitored “Messeturm” high rise building in Germany
supported by Frankfurt over-consolidated clay. A study of the
application of piled raft in soft clay compared with traditional piled
raft system in view of settlement, differential settlement, piles type
and capacity and the engineering value will be discussed.
The thesis consists of six chapters:
Chapter (1) is an introduction to this research; it discusses the
importance, the scope and the main objectives of the research.
Chapter (2) is a literature review which briefly summarizes the
different methods of analysis piled raft system; also, it presents the
previous monitored piled raft systems in different soil conditions.
Chapter (3) presents a brief discussion about finite element method
and the different constitutive laws to simulate the different elements
of the piled raft foundations system.
Chapter (4) presents the verification of the numerical modeling
using two cases: conceptual simplified case and “Messeturm” high
rise building in Frankfurt, Germany.
Chapter (5) discusses a characterization of North Delta clay; with a
static pile load test in Port Said soft clay. It presents also application
of piled raft system compared with the traditional raft on piles for a
water treatment tank exist east of Al Tafreah-Port Said.
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Chapter (6) discusses the conclusions conducted from this research
and the recommendations for the future studies.