الفهرس 
Statement of the Problem
PROPERTIES OF THE CALCAREOUS CEMENTED SAND IN KUWAITOnly 14 pages are availabe for public view
 |  | from | 170 |  |  |
| | | from | 170 | | |
Abstract
The calcareous cemented sand exists in many places around the world where in
last two decades there was a huge development. During such huge development,
the foundation design was a major challenge. This research aims to introduce the
piled raft foundation as a competitor solution for this challenge.
To achieve this goal, a research plan consist of four stage was planned by the
author. These stages are investigating the characteristic behavior of calcareous
cemented sand, selecting a presentable constitutive law for the calcareous
cemented sand, utilizing pile load test result to calibrate the constitutive law
parameters, and analysis a case history dealing with conventional piled
foundation using the piled raft concept respectively.
Investigating the characteristic behavior of calcareous cemented sand reveals a
cohesion intercept because of existence of carbonates as bonding agent at points
of contact between the particles and interlocking between the particles. Also,
investigating the characteristic behavior of calcareous cemented sand shows
increased stiffness with depth, small difference between the peak friction angle
and residual friction angel, and unloading reloading stiffness is higher than the
loading stiffness.
Based on this characteristic behavior of calcareous cemented sand, double
hardening soil model has been utilized as a suitable constitutive law to represent
the stress strain behavior of calcareous cemented sand. In light of available
published triaxial tests on calcareous cemented sand, the parameters of double hardening soil model were estimated. Moreover, calibration of these parameters
was conducted via back calculation of real pile load tests in calcareous cemented
sand.
In the end of this research, a conventional case history dealing with pile
foundation was redesigned applying the piled raft concept, where raft, pile, and
soil mutual interactions were introduced using a 3D finite elements analysis. The
soil was modeled by the double hardening model, the raft was utilized using plate
element, and the piles were modeled using embedded pile model.