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Article: Analytical design method for a truss-bolt system for reinforcement of fractured coal mine roofs - Illustrated with a case study

TitleAnalytical design method for a truss-bolt system for reinforcement of fractured coal mine roofs - Illustrated with a case study
Authors
KeywordsAnalytical design method
Case studies
Coal mining
Rock roof
Truss bolt
Tunnel
Issue Date2005
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijrmms
Citation
International Journal Of Rock Mechanics And Mining Sciences, 2005, v. 42 n. 2, p. 195-218 How to Cite?
AbstractThis paper presents an analytical design method for the truss-bolt system in reinforcing underground fractured rock roofs in coal mines. The analytical design method is based on the mechanical analysis of the fractured rock roof with reinforcement by inclined roof bolts and a horizontal tie-rod. The mechanical analysis for the system includes a non-linear bending model for the laterally inclined roof bolts and three upper and lower bounds. The lateral resistance of the inclined roof bolts in a truss-bolt-supported roadway is examined using classical theory of a non-linear beam in bending. The paper analyses the arching action by lateral behavior of the inclined roof bolts in reinforcing the fractured roof. Based on mechanical models, the design formula concerning the lateral bolt forces, tensions in the tie-rod in the truss system, as well as the reinforcement behavior have been derived. In order to ensure that the roof truss-bolt system reinforces the coal roof effectively, a lower bound of pre-tightening forces must be applied on the tie-rod for stabilizing the fractured roof by arching action. The pre-tightening forces exerted via the tie-rod also cannot be greater than its upper bound, since the excessive tightening force will cause localized failure in the rock near the bolt tail at the abutment of the fractured roof beam. The analytical formulas for both lower and upper bounds for truss pre-tightening forces are put forward in this paper. Furthermore, the paper also presents analytical equations for designing the axial forces and dimensions for bolts in this kind of system. Parametric studies and optimization analysis are also carried out on the basis of the proposed approach. A flow chart and procedures are presented to show the analytical design method for this truss-bolt system. Case studies are presented to show how the method can be used in actual coal mining tunnels. The predicted results compare well with those measured in the actual case studies. © 2004 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/71539
ISSN
2015 Impact Factor: 2.01
2015 SCImago Journal Rankings: 2.134
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Ben_HK
dc.contributor.authorYue, ZQen_HK
dc.contributor.authorTham, LGen_HK
dc.date.accessioned2010-09-06T06:32:54Z-
dc.date.available2010-09-06T06:32:54Z-
dc.date.issued2005en_HK
dc.identifier.citationInternational Journal Of Rock Mechanics And Mining Sciences, 2005, v. 42 n. 2, p. 195-218en_HK
dc.identifier.issn1365-1609en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71539-
dc.description.abstractThis paper presents an analytical design method for the truss-bolt system in reinforcing underground fractured rock roofs in coal mines. The analytical design method is based on the mechanical analysis of the fractured rock roof with reinforcement by inclined roof bolts and a horizontal tie-rod. The mechanical analysis for the system includes a non-linear bending model for the laterally inclined roof bolts and three upper and lower bounds. The lateral resistance of the inclined roof bolts in a truss-bolt-supported roadway is examined using classical theory of a non-linear beam in bending. The paper analyses the arching action by lateral behavior of the inclined roof bolts in reinforcing the fractured roof. Based on mechanical models, the design formula concerning the lateral bolt forces, tensions in the tie-rod in the truss system, as well as the reinforcement behavior have been derived. In order to ensure that the roof truss-bolt system reinforces the coal roof effectively, a lower bound of pre-tightening forces must be applied on the tie-rod for stabilizing the fractured roof by arching action. The pre-tightening forces exerted via the tie-rod also cannot be greater than its upper bound, since the excessive tightening force will cause localized failure in the rock near the bolt tail at the abutment of the fractured roof beam. The analytical formulas for both lower and upper bounds for truss pre-tightening forces are put forward in this paper. Furthermore, the paper also presents analytical equations for designing the axial forces and dimensions for bolts in this kind of system. Parametric studies and optimization analysis are also carried out on the basis of the proposed approach. A flow chart and procedures are presented to show the analytical design method for this truss-bolt system. Case studies are presented to show how the method can be used in actual coal mining tunnels. The predicted results compare well with those measured in the actual case studies. © 2004 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijrmmsen_HK
dc.relation.ispartofInternational Journal of Rock Mechanics and Mining Sciencesen_HK
dc.subjectAnalytical design methoden_HK
dc.subjectCase studiesen_HK
dc.subjectCoal miningen_HK
dc.subjectRock roofen_HK
dc.subjectTruss bolten_HK
dc.subjectTunnelen_HK
dc.titleAnalytical design method for a truss-bolt system for reinforcement of fractured coal mine roofs - Illustrated with a case studyen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1365-1609&volume=42&spage=195&epage=218&date=2005&atitle=Analytical+design+method+for+a+truss-bolt+system+for+reinforcement+of+fractured+coal+mine+roofs+-+illustrated+with+a+case+studyen_HK
dc.identifier.emailYue, ZQ:yueqzq@hkucc.hku.hken_HK
dc.identifier.emailTham, LG:hrectlg@hkucc.hku.hken_HK
dc.identifier.authorityYue, ZQ=rp00209en_HK
dc.identifier.authorityTham, LG=rp00176en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijrmms.2004.08.006en_HK
dc.identifier.scopuseid_2-s2.0-12344275660en_HK
dc.identifier.hkuros97174en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-12344275660&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume42en_HK
dc.identifier.issue2en_HK
dc.identifier.spage195en_HK
dc.identifier.epage218en_HK
dc.identifier.isiWOS:000226949100003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiu, B=36013061400en_HK
dc.identifier.scopusauthoridYue, ZQ=7102782735en_HK
dc.identifier.scopusauthoridTham, LG=7006213628en_HK

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