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dc.contributor.authorHarwood, Cary P.en
dc.date.accessioned2014-03-14T21:45:57Zen
dc.date.available2014-03-14T21:45:57Zen
dc.date.issued1996-06-12en
dc.identifier.otheretd-09182008-063231en
dc.identifier.urihttp://hdl.handle.net/10919/44801en
dc.description.abstractA model was developed to facilitate secondary tailgate support selection based on analysis of a data base of over 100 case studies compiled from two different surveys of operating longwall coal mines in the United States. The ALPS (Analysis of Long wall Pillar Stability) program was used to determine adequacy of pillar design for the successful longwall case histories. A relationship was developed between the secondary support density necessary to maintain a stable tailgate entry during mining and the CMRR (Coal Mine Roof Rating). This relationship defines the lower bound of secondary support density currently used in longwall mines. The model used only successful tailgate case history data with adequate ALPS SF according to the CMRR for each case. This model facilitates mine design by predicting secondary support density required for a tailgate entry depending on the ALPS SF and CMRR, which can result in significant economic benefits.en
dc.format.extentx, 118 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.isformatofOCLC# 35332690en
dc.relation.haspartLD5655.V855_1996.H379.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcoal miningen
dc.subjectLongwallen
dc.subjecttailgateen
dc.subjectsecondary supporten
dc.subjectcapacityen
dc.subject.lccLD5655.V855 1996.H379en
dc.titleOptimizing secondary tailgate support selectionen
dc.typeThesisen
dc.contributor.departmentMining and Minerals Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineMining and Minerals Engineeringen
dc.contributor.committeechairHaycocks, Christopheren
dc.contributor.committeememberKarmis, Michael E.en
dc.contributor.committeememberLuttrell, Gerald H.en
dc.type.dcmitypeTexten
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09182008-063231/en
dc.date.sdate2008-09-18en
dc.date.rdate2008-09-18en
dc.date.adate2008-09-18en


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