Evaluation of installation timing of initial ground support for large-span tunnel in hard rock

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dc.contributor.author Feng, Jimeng
dc.contributor.author Yan, Congwen
dc.contributor.author Ye, Lun
dc.contributor.author Ding, Xiaoqi
dc.contributor.author Zhang, Junru
dc.contributor.author Li, Zili
dc.date.accessioned 2019-09-19T11:39:24Z
dc.date.available 2019-09-19T11:39:24Z
dc.date.issued 2019-08-20
dc.identifier.citation Feng, J., Yan, C., Ye, L., Ding, X., Zhang, J. and Li, Z. (2019) 'Evaluation of installation timing of initial ground support for large-span tunnel in hard rock', Tunnelling and Underground Space Technology, 93, 103087 (17 pp). 10.1016/j.tust.2019.103087 en
dc.identifier.volume 93 en
dc.identifier.startpage 1 en
dc.identifier.endpage 17 en
dc.identifier.issn 0886-7798
dc.identifier.uri http://hdl.handle.net/10468/8577
dc.identifier.doi 10.1016/j.tust.2019.103087 en
dc.description.abstract In conventional drill and blast tunnelling, initial ground support is placed immediately after the current round is shot before excavation of the next round (i.e. one-round installation method). When tunnelling in hard rock, one-round installation of initial ground support conservatively ensures tunnel integrity, but meanwhile brings up other problems such as over-break at tunnel face, slow excavation rate and so forth. In this study, a large-span tunnel in Class III hard rock was monitored by a network of sensors to investigate tunnel internal forces in three construction scenarios where initial ground supports were placed in different timing and sequence: (1) initial ground support installed immediately after current round (2) support installed after two rounds (3) support installed after three consecutive rounds. The collected field measurements together with construction records were evaluated from three aspects: structural stability, constructability and cost-effectiveness. Results show that the installation of initial ground support after two rounds generally led to the most regular and minimum tunnel internal forces of the three construction scenarios, whilst it managed to minimize under & over-break and allow more space for construction convenience. In the meanwhile, this installation sequence significantly accelerated tunnel advance rate at lower material cost. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.uri http://www.sciencedirect.com/science/article/pii/S0886779819302986
dc.rights © 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 licence. en
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.subject Hard rock tunnelling en
dc.subject Installation timing en
dc.subject Constructability en
dc.subject Initial ground support en
dc.subject Large-span tunnel en
dc.title Evaluation of installation timing of initial ground support for large-span tunnel in hard rock en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Zili Li, Civil Engineering, University College Cork, Cork, Ireland. +353-21-490-3000 Email: zili.li@ucc.ie en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 24 months after publication by request of the publisher. en
dc.check.date 2021-08-20
dc.date.updated 2019-09-19T11:33:27Z
dc.description.version Accepted Version en
dc.internal.rssid 499775560
dc.contributor.funder National Natural Science Foundation of China en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Tunnelling And Underground Space Technology en
dc.internal.copyrightchecked No
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress zili.li@ucc.ie en
dc.identifier.articleid 103087 en
dc.relation.project National Natural Science Foundation of China (No.51508476) en


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© 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 licence. Except where otherwise noted, this item's license is described as © 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 licence.
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