The effect of model domain size for unsupported plain strain tunnel headings in undrained clay

Shiau, Jim and Al-Asadi, Fadhil (2017) The effect of model domain size for unsupported plain strain tunnel headings in undrained clay. In: Third International Conference on Science, Engineering and Environment (SEE-2017), 13-16 Nov 2017, Springfield, Brisbane, Australia.

Official URL: http://www.geomate.org/

Abstract

This paper examines the effect of model domain size for unsupported plain strain tunnel headings in
undrained clay. The tunnel heading models for different soil parameters (depth ratio C/D and strength ratio
Su/γD) are studied using the finite element limit analysis and strength reduction technique to determine the ideal
geometric parameters X/C, L/C, and B/C of established numerical models. The upper and lower bound limit
solutions are presented alongside finite difference results for validation. A thorough comparison between these
two methods finds a very good agreement. Design charts are established for a broad range of practical scenarios
using dimensionless ratios, similar to the traditional slope stability design chart. Typical examples are presented
to illustrate the usefulness for practicing engineers.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright @ 2017 by The GEOMATE International Society.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 16 Jan 2019 05:29
Last Modified: 24 Jun 2019 03:15
Uncontrolled Keywords: model domain size, plain strain heading, undrained clay, strength reduction method, limit analysis, design chart
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
01 Mathematical Sciences > 0103 Numerical and Computational Mathematics > 010301 Numerical Analysis
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/33795

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