Effect of existing building on tunneling-induced ground movements
Name
812869906-MIT.pdf
Description
Full printable version
Size
12.86 MB
Format
Adobe PDF
Checksum (MD5)
08a80c9832109d6d3877b3fe6e95381b
Author(s)
Law, Rachel Hoi-chee
Advisor(s)
Andrew J. Whittle.
Date Issued
2012
Publisher
Massachusetts Institute of Technology
Abstract
The goal of this thesis is to assess the influence of an existing structure on tunneling-induced ground movements. This is accomplished through 2D numerical simulations that are compared with similar prior studies reported by Potts and Addenbrooke (1997). The current study uses the Plaxis finite element code together with the Hardening Soil (HS and HSS) family of constitutive models in order to represent the undrained shear behavior of clay. Input parameters of the HS and HSS models were calibrated for the case of London Clay and compared with results of Potts and Addenbrooke (1997) who used a non-linear elastic model (PJ model). Results have clearly indicated that the choice of soil model has an important influence on the prediction of greenfield ground settlement. The HSS model with the selected set of stiffness parameters provides a reasonable fit with the PJ model and matches closely the greenfield settlement trough expected from empirical models. Numerical analyses are carried out to evaluate the effects of the self-weight, and equivalent elastic bending and axial stiffness of a surface building on tunneling-induced ground movements. For the case of a weightless building, design modification factors for bending and axial stiffness are consistent with results promulgated in Potts and Addenbrooke (1997). For the self-weight scenario, the current analyses indicated that neglecting this factor in the analyses can result in nonconservative estimate of modification factors for deflection ratio and horizontal strain. It is therefore suggested that the effect of building weight cannot be neglected when the boundary effect of building stiffness on the ground is used as a tool to reduce the estimated values of greenfield settlement trough or deflection ratio and horizontal strain of existing buildings in a building damage assessment.
Description
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 113-115).
Subjects
Civil and Environmental Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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