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Article: Characterization of the disturbed zone in a large rock excavation for the Three Gorges Project
Title | Characterization of the disturbed zone in a large rock excavation for the Three Gorges Project |
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Authors | |
Keywords | Brittle rock mass Disturbed zone Excavation Finite element method Mechanical properties Reinforcement |
Issue Date | 2001 |
Publisher | NRC 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? |
Abstract | Excavation 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 Identifier | http://hdl.handle.net/10722/42064 |
ISSN | 2023 Impact Factor: 3.0 2023 SCImago Journal Rankings: 1.513 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Deng, JH | en_HK |
dc.contributor.author | Lee, CF | en_HK |
dc.contributor.author | Ge, XR | en_HK |
dc.date.accessioned | 2007-01-08T02:28:04Z | - |
dc.date.available | 2007-01-08T02:28:04Z | - |
dc.date.issued | 2001 | en_HK |
dc.identifier.citation | Canadian Geotechnical Journal, 2001, v. 38 n. 1, p. 95-106 | en_HK |
dc.identifier.issn | 0008-3674 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/42064 | - |
dc.description.abstract | Excavation 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.extent | 2754317 bytes | - |
dc.format.extent | 4105 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.publisher | NRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgj | en_HK |
dc.relation.ispartof | Canadian Geotechnical Journal | en_HK |
dc.rights | Canadian Geotechnical Journal. Copyright © N R C Research Press. | en_HK |
dc.subject | Brittle rock mass | en_HK |
dc.subject | Disturbed zone | en_HK |
dc.subject | Excavation | en_HK |
dc.subject | Finite element method | en_HK |
dc.subject | Mechanical properties | en_HK |
dc.subject | Reinforcement | en_HK |
dc.title | Characterization of the disturbed zone in a large rock excavation for the Three Gorges Project | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+Project | en_HK |
dc.identifier.email | Lee, CF: leecf@hkucc.hku.hk | en_HK |
dc.identifier.authority | Lee, CF=rp00139 | en_HK |
dc.description.nature | published_or_final_version | en_HK |
dc.identifier.doi | 10.1139/cgj-38-1-95 | en_HK |
dc.identifier.scopus | eid_2-s2.0-57249110458 | en_HK |
dc.identifier.hkuros | 61010 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-57249110458&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 38 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | 95 | en_HK |
dc.identifier.epage | 106 | en_HK |
dc.identifier.isi | WOS:000167370700008 | - |
dc.publisher.place | Canada | en_HK |
dc.identifier.scopusauthorid | Deng, JH=7402612983 | en_HK |
dc.identifier.scopusauthorid | Lee, CF=8068602600 | en_HK |
dc.identifier.scopusauthorid | Ge, XR=8579160600 | en_HK |
dc.identifier.issnl | 0008-3674 | - |