Settlement analyses of underground circular tunneling in soft clay

Shiau, J. S. and Sams, M. S. and Zhang, J. and Kemp, R. J. (2014) Settlement analyses of underground circular tunneling in soft clay. In: 8th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground (TC204 ISSMGE IS-SEOUL 2014) , 25-27 Aug 2014, Seoul, South Korea.

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Abstract

An increasing number of tunnels have been constructed worldwide due to urbanization and industrial purposes. In the past few decades, tunnel boring machines (TBM) have been used to drill in increasingly difficult geotechnical conditions such as soft ground like soft clay. Because of the difficulties associated with this, it is crucial to estimate ground surface settlement induced by tunnelling. This is to ensure the safety of tunnel construction as well as to minimize the associated impact on surrounding infrastructure. In tunnel construction, prediction of ground settlement is frequently estimated using a specified tunnel volume loss, and by applying semi-empirical methods and relying on engineer's experiences. One of the key constant parameters in the semiempirical method, K, is generally estimated using basic soil classifications, which has the potential to lead to inaccurate judgement from engineers. Better estimation of the constant K has had limited attention by other studies. This paper uses a force relaxation technique and the finite difference program, FLAC, to estimate the circular settlement profile and a K value for a range of different scenarios. A number of particular cases are numerically simulated with variation in the factors that influence the tunnel transverse settlement including tunnel depth to diameter ratios (C/D) and clay strength ratios (γD/cu). Results from the study compare favourably with previous empirical and analytical studies. A range of K values is proposed for different soil strengths and tunnel dimensions.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 Korean Geotechnical Society. Permanent restricted access to published version due to publisher copyright policy. Paper presented at: 8th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground (TC204 ISSMGE IS-SEOUL 2014), Seoul, 25-27 Aug 2014.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 10 May 2015 23:18
Last Modified: 01 Aug 2017 23:49
Uncontrolled Keywords: circular; clay; settlement; tunneling (excavation); tunnel boring machine(TBM)
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0905 Civil Engineering > 090502 Construction Engineering
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
Socio-Economic Objective: B Economic Development > 87 Construction > 8704 Construction Processes > 870403 Industrial Construction Processes
Identification Number or DOI: 10.1201/b17240-63
URI: http://eprints.usq.edu.au/id/eprint/26817

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