Revisiting Broms and Bennermarks’ original stability number for tunnel headings

Shiau, Jim and Al-Asadi, Fadhil (2018) Revisiting Broms and Bennermarks’ original stability number for tunnel headings. Geotechnique Letters, 8 (4).

Text (Online Accepted Version)

Download (1074Kb) | Preview


For undrained clay without volume loss during plastic shearing, stability results are independent of loading directions, and the combination of surcharge, self-weight and internal supporting pressures can produce failure either in collapse or blowout in tunnel stability problems. This paper investigates the use of Broms and Bennermark’s original stability number for tunnel heading problems. The shear strength reduction method is used to obtain rigorous upper bound and lower bound factors of safety for the models under different combinations of pressures. The factor of safety results, which are functions of the stability number and depth ratio, are compared and validated by using the finite difference method as well as other existing solutions available in the literature. The dimensionless ratios employed in this study make the design charts suitable to cover a broad range of tunnel geometries and soil parameters. The charts can also be used to provide an estimation of internal tunnelling pressures, making them useful for designers and practising engineers.

Statistics for USQ ePrint 35123
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published online in ‘accepted manuscript’ format: 05 November 2018.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 29 Nov 2018 06:27
Last Modified: 10 Dec 2018 04:41
Uncontrolled Keywords: tunnel heading, stability number, factor of safety, shear strength reduction method, design chart
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1680/jgele.18.00145

Actions (login required)

View Item Archive Repository Staff Only