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Article: Characterization of the disturbed zone in a large rock excavation for the Three Gorges Project

TitleCharacterization of the disturbed zone in a large rock excavation for the Three Gorges Project
Authors
KeywordsBrittle rock mass
Disturbed zone
Excavation
Finite element method
Mechanical properties
Reinforcement
Issue Date2001
PublisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgj
Citation
Canadian Geotechnical Journal, 2001, v. 38 n. 1, p. 95-106 How to Cite?
AbstractExcavation in a rock mass leads to the perturbation of the stress regime, often creating a stress-relieved, locally weakened zone known as the disturbed zone. This paper presents the results of in situ studies that were carried out both in the central rock barrier (or separation block) between the shiplift and the temporary shiplock and in the northern slope of the permanent shiplock of the Three Gorges Project. The vertical extent of the disturbed zone was determined jointly by cross-hole seismic wave penetration testing and borehole elastic modulus testing, and the horizontal extent was assessed by monitoring and evaluating the deformation characteristics. Compared with the undisturbed rock mass, the P-wave velocity of the disturbed zone was reduced by 34-38% and the borehole elastic modulus by 12-31%. The reductions were caused by the opening of primary structural planes or the extension of apertures due to local sliding along the structural planes. In the disturbed zone, no newly formed fractured planes were found. The observed disturbed zone was compared with the tensile stress zones and the shear-damaged zones calculated by the finite element method. A rock reinforcement scheme was recommended and implemented.
Persistent Identifierhttp://hdl.handle.net/10722/42064
ISSN
2015 Impact Factor: 1.877
2015 SCImago Journal Rankings: 2.093
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDeng, JHen_HK
dc.contributor.authorLee, CFen_HK
dc.contributor.authorGe, XRen_HK
dc.date.accessioned2007-01-08T02:28:04Z-
dc.date.available2007-01-08T02:28:04Z-
dc.date.issued2001en_HK
dc.identifier.citationCanadian Geotechnical Journal, 2001, v. 38 n. 1, p. 95-106en_HK
dc.identifier.issn0008-3674en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42064-
dc.description.abstractExcavation in a rock mass leads to the perturbation of the stress regime, often creating a stress-relieved, locally weakened zone known as the disturbed zone. This paper presents the results of in situ studies that were carried out both in the central rock barrier (or separation block) between the shiplift and the temporary shiplock and in the northern slope of the permanent shiplock of the Three Gorges Project. The vertical extent of the disturbed zone was determined jointly by cross-hole seismic wave penetration testing and borehole elastic modulus testing, and the horizontal extent was assessed by monitoring and evaluating the deformation characteristics. Compared with the undisturbed rock mass, the P-wave velocity of the disturbed zone was reduced by 34-38% and the borehole elastic modulus by 12-31%. The reductions were caused by the opening of primary structural planes or the extension of apertures due to local sliding along the structural planes. In the disturbed zone, no newly formed fractured planes were found. The observed disturbed zone was compared with the tensile stress zones and the shear-damaged zones calculated by the finite element method. A rock reinforcement scheme was recommended and implemented.en_HK
dc.format.extent2754317 bytes-
dc.format.extent4105 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgjen_HK
dc.relation.ispartofCanadian Geotechnical Journalen_HK
dc.rightsCanadian Geotechnical Journal. Copyright © N R C Research Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectBrittle rock massen_HK
dc.subjectDisturbed zoneen_HK
dc.subjectExcavationen_HK
dc.subjectFinite element methoden_HK
dc.subjectMechanical propertiesen_HK
dc.subjectReinforcementen_HK
dc.titleCharacterization of the disturbed zone in a large rock excavation for the Three Gorges Projecten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0008-3674&volume=38&issue=1&spage=95&epage=106&date=2001&atitle=Characterization+of+the+disturbed+zone+in+a+large+rock+excavation+for+the+Three+Gorges+Projecten_HK
dc.identifier.emailLee, CF: leecf@hkucc.hku.hken_HK
dc.identifier.authorityLee, CF=rp00139en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1139/cgj-38-1-95en_HK
dc.identifier.scopuseid_2-s2.0-57249110458en_HK
dc.identifier.hkuros61010-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57249110458&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue1en_HK
dc.identifier.spage95en_HK
dc.identifier.epage106en_HK
dc.identifier.isiWOS:000167370700008-
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridDeng, JH=7402612983en_HK
dc.identifier.scopusauthoridLee, CF=8068602600en_HK
dc.identifier.scopusauthoridGe, XR=8579160600en_HK

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