Relating volume loss and greenfield settlement

Shiau, Jim and Sams, Mathew (2019) Relating volume loss and greenfield settlement. Tunnelling and Underground Space Technology, 83. pp. 145-152. ISSN 0886-7798

Abstract

This paper develops a numerical procedure for investigating settlement induced by circular tunnels in soft soils. The numerical procedure aims to simulate the movement and relaxation of the soil around the shield and lining annulus that occurs due to the overcutting and grouting of the tunnel void by a tunnel boring machine. A stress relaxation technique that progressively reduces the tunnel support pressure from a specific amount until a point of failure is detected. For three separate stages before this point of failure, the surface settlement data is exported for analysis. Using a regression of the commonly used Gaussian equation on the settlement data, ix values can be determined for each case. This is done for a number of geometry and soil stiffness and strength ratios which will cover the most practical range for soft cohesive soils. The results of this study are quite positive, settlement results compare well with previous experimental and observational results. Design charts using dimensionless ratios have therefore been presented.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 24 Oct 2018 05:54
Last Modified: 05 Apr 2019 02:07
Uncontrolled Keywords: tunnel; greenfield settlement; undrained; cohesive soil; volume loss
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
Identification Number or DOI: 10.1016/j.tust.2018.09.041
URI: http://eprints.usq.edu.au/id/eprint/34956

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