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dc.contributor.authorHarwood, Cary P.en_US
dc.date.accessioned2014-03-14T21:45:57Z
dc.date.available2014-03-14T21:45:57Z
dc.date.issued1996-06-12en_US
dc.identifier.otheretd-09182008-063231en_US
dc.identifier.urihttp://hdl.handle.net/10919/44801
dc.description.abstract

A 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_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V855_1996.H379.pdfen_US
dc.subjectcoal miningen_US
dc.subjectLongwallen_US
dc.subjecttailgateen_US
dc.subjectsecondary supporten_US
dc.subjectcapacityen_US
dc.subject.lccLD5655.V855 1996.H379en_US
dc.titleOptimizing secondary tailgate support selectionen_US
dc.typeThesisen_US
dc.contributor.departmentMining and Minerals Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairHaycocks, Christopheren_US
dc.contributor.committeememberKarmis, Michael E.en_US
dc.contributor.committeememberLuttrell, Gerald H.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09182008-063231/en_US
dc.date.sdate2008-09-18en_US
dc.date.rdate2008-09-18
dc.date.adate2008-09-18en_US


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