Author: Hu, Bohang
Title: Numerical tool for the back analysis of retaining wall systems
Degree: M.Sc.
Year: 2016
Subject: Hong Kong Polytechnic University -- Dissertations
Retaining walls
Structural analysis (Engineering) -- Mathematical models
Department: Faculty of Construction and Environment
Pages: xii, 212 pages : color illustrations
Language: English
Abstract: The back analysis of retaining structures is one of the most common and imperative methodology used in nowadays construction project, especially in excavation project and stable foundation of highway engineering. This dissertation aims to combine the basic lateral earth pressure calculation principle of retaining structures, which are Coulomb theory and Rankine theory, with the MATLAB GUI techniques as well as the basic programming basics to establish three kinds of isolated numerical back analysis models. These three models, which are multiple soil layer earth pressure analysis model, gravity wall back analysis model and embedded wall back analysis model, have their own operation interface and could be used in different design. Firstly, the multiple soil layer earth pressure analysis model is modelled to calculate two sides' earth pressures of embedded wall even in groundwater existence case, a worked example has been made comparison with this model under the same set of soil parameters to ensure that the basic calculation principle is correct. At the second stage, the gravity wall can take both the Coulomb theory and Rankine theory into account to analyse whether the design of the gravity wall can satisfy the design requirement or not, this chapter contains a worked example also can be checked in comparison to the gravity wall back analysis model to make sure the results originated is accurate. The following stage, the embedded wall consists of cantilever wall back analysis model and propped wall back analysis model, this model is proposed to roughly design the wall height of two types embedded wall according to the various kinds of soil parameters at both sides, meanwhile, it also can carry out back analysis under undrained condition and undrained to drained condition. As for this kind of embedded wall model, user can obtain actual pressures, pore pressures, bending moment, shear force as well as the deflection intuitively via the graphic result output window. At the following stages, this model can be adjusted manually to obtain more accurate result. Furthermore, the embedded wall model is established to make comparison with the commercial software "Frew" (Flexible Retaining Walls), the latter is constructed by Oasys Ltd., Frew enables users to define and figure out complicated embedded flexible earth retaining structures problems efficiently.
In this dissertation, the content started from the literature view, followed by these three types back analysis model, each model is illustrated in sequence of its basic calculation principle, schematic calculation diagram, results view and comparison, summary and discussion and so on. There is no doubt these three kinds of retaining wall back analysis models have their own disadvantages due to the limitation of the code editing. The merits and demerits of each model also have been discussed at the end of each chapter.
Access: restricted access

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