الفهرس 
LITERATURE SURVEYOnly 14 pages are availabe for public view
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Abstract
Implementation of subway systems became one of the effective
solutions to overcome some of the enviromental problems which face
man’s life sepecially in large highly populated cities.
Construction of subway stations and tunnels using the cut-and-
cover terhnique empIoy mg reinforced concrete diaphragm walls is
considered one of the most effective methods for controlling ground
movements wi th minor effects on the adjacent existing structures.
Analysis of such braced walls is considered one of the most
sophisticated soil-structure interaction problems.
This research proposes a numerical modelling for analysis of
diaphragm walls during the different construction stages of tunnels
and subway stations. The associated variations in the soil stress
field and deformations were investigated. In order to carry out
such analysis, a computer program was specially upgraded using the
Fortran language. Eight-node isoparametric finite elements were used
to simulate the soil continuum and the diaphragm wall, the nonlinear
stress-strain behaviour of the soil employing modified Duncan model
(1984) were utilized. Spring type interface elements were also
introduced to model the soil-diaphragm wall contact surface.
This thesis presents a comparative study between results of the
nonlinear finite element analysis and the field measurements which
had been compiled during construction of the Greater Cairo
Underground Metro, Phase 1. Also, results of the analysis were
compared with the predicted values from the commonly used empirical
design rules of such walls.
An extensive parametric study was also carried out to evaluate
the sensi tivity of the utilized numerical model and the effect of
different factors concerning the soil-wall interaction on the
behaviour of the diaphragm wall and the associated soil deformations
and stress field.