Stability charts for unsupported plane strain tunnel headings in homogeneous undrained clay

Shiau, Jim and Sams, Mathew and Al-Asadi, Fadhil and Mirza Hassan, Mohammad (2018) Stability charts for unsupported plane strain tunnel headings in homogeneous undrained clay. International Journal of GEOMATE, 14 (41). pp. 19-26. ISSN 2186-2982


ABSTRACT: This paper investigates the stability of plane strain tunnel headings in undrained soils. Using the factor of safety approach via the strength reduction technique, the idealised tunnel heading models are studied using the finite difference program FLAC. This problem is also similar to underground long wall excavations in plane strain condition. The finite difference results are presented alongside upper and lower bound limit solutions for validation. A thorough comparison between these two methods finds a very good agreement. Design charts are presented for a wide range of practical scenarios using dimensionless ratios, similar to Taylor’s design charts used for slope stability. Typical examples are presented to illustrate the usefulness for practising engineers.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright © Int. J. of GEOMATE. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 26 Mar 2018 05:25
Last Modified: 25 Mar 2019 04:43
Uncontrolled Keywords: plain strain heading, undrained clay, stability, strength reduction method, 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
Identification Number or DOI: doi:10.21660/2018.41.29138

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