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

dc.check.date2021-08-20
dc.check.infoAccess to this article is restricted until 24 months after publication by request of the publisher.en
dc.contributor.authorFeng, Jimeng
dc.contributor.authorYan, Congwen
dc.contributor.authorYe, Lun
dc.contributor.authorDing, Xiaoqi
dc.contributor.authorZhang, Junru
dc.contributor.authorLi, Zili
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.date.accessioned2019-09-19T11:39:24Z
dc.date.available2019-09-19T11:39:24Z
dc.date.issued2019-08-20
dc.date.updated2019-09-19T11:33:27Z
dc.description.abstractIn 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.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid103087en
dc.identifier.citationFeng, 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.2019.103087en
dc.identifier.doi10.1016/j.tust.2019.103087en
dc.identifier.endpage17en
dc.identifier.issn0886-7798
dc.identifier.journaltitleTunnelling And Underground Space Technologyen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/8577
dc.identifier.volume93en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.projectNational Natural Science Foundation of China (No.51508476)en
dc.relation.urihttp://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.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectHard rock tunnellingen
dc.subjectInstallation timingen
dc.subjectConstructabilityen
dc.subjectInitial ground supporten
dc.subjectLarge-span tunnelen
dc.titleEvaluation of installation timing of initial ground support for large-span tunnel in hard rocken
dc.typeArticle (peer-reviewed)en
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