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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Technology >
Thesis - Civil Engineering >
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http://hdl.handle.net/123456789/2213
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| Title: | Analysis and parametric study of deep excavation with diaphragm wall using finite element based software |
| Authors: | Tewodros, Fekadu |
| Advisors: | Prof. Alemayehu Teferra |
| Keywords: | civil engineering |
| Copyright: | Jun-2010 |
| Date Added: | 3-May-2012 |
| Publisher: | AAU |
| Abstract: | Control of soil deformation is crucial for deep excavation in congested urban areas to
minimize its effect on adjacent structures. Therefore, an analysis and parametric study
is important to realistically represent the response of the soil to excavation and to
predict the magnitude and pattern of ground movement.
This thesis presents a study of the effects of deep excavations with tie back diaphragm
wall in expansive clay and red silty clay which are located in Bole Medehanealem
area and Arada respectively, and also in cohesionless granular sandy soil. The
objectives of this study are to investigate the effect of different parameters on the
prediction of ground movement by numerical analysis and to develop a method of
estimating these effects quantitatively. Extensive review of relevant literature
published in the past four decades was conducted in order to understand the trends
and the key developments in this area. It was revealed from the literature review that
the concurrent use of the observational method and the finite element method for
monitoring and controlling of ground deformations around the excavation has become
a norm for deep excavation projects.
Parametric studies were carried out to identify important variables controlling the
mechanisms of soil-structure interaction. The analyses focus on deep excavations
supported by tie-backed diaphragm walls using techniques of top down construction.
Exact site conditions and input parameters for the soil were incorporated as much as
possible. The principal parameters considered in the study include soil type, depth of
excavation, wall embedment depth, wall stiffness, and strut spacing. These variables
were used to conduct a series of finite element analyses using simplified geometry
and ground conditions for the purpose of achieving the objective of this thesis. Results
of these analyses were recorded in terms horizontal displacement of the diaphragm
wall, ground settlement behind the diaphragm wall, and bending moments induced in
the diaphragm wall due to an adjacent deep excavation. |
| URI: | http://hdl.handle.net/123456789/2213 |
| Appears in: | Thesis - Civil Engineering
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