Determination of the effect of roof pressure on coal hardness and excavation productivity: an example from a Cayirhan lignite mine, Ankara, Central Turkey

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dc.contributor.authorBilim, Niyazi
dc.contributor.authorOezkan, Ihsan
dc.date.accessioned2020-03-26T17:26:39Z
dc.date.available2020-03-26T17:26:39Z
dc.date.issued2008
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractMechanized longwall mines require a systematic excavation schedule to control roof stress. Excavation sometimes becomes easier when the cutting cycle is interrupted and the face is subjected to in-situ strain, because the excavation machine may perform more efficiently. However, under those circumstances, it is important to determine the critical point at which this advantage overcomes the negative safety (high roof pressure) and productivity (long wait) aspects. This study was conducted in a retreating longwall underground mine in which a mechanized excavation system is used. To determine the most efficient extraction rate, time-dependent changes in the support pressures and coal hardness measurements made with the Schmidt hammer method were determined at the coal face. Thus, a time-dependent relationship between the hardness of the coal face and roof pressure was established. As a result of these analyses, the optimum waiting time before excavation was determined (for the mine in which the measurements were carried out) in terms of support safety and excavation productivity. (C) 2008 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.coal.2008.04.002en_US
dc.identifier.endpage118en_US
dc.identifier.issn0166-5162en_US
dc.identifier.issue2en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage113en_US
dc.identifier.urihttps://dx.doi.org/10.1016/j.coal.2008.04.002
dc.identifier.urihttps://hdl.handle.net/20.500.12395/22316
dc.identifier.volume75en_US
dc.identifier.wosWOS:000257615400007en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherELSEVIER SCIENCE BVen_US
dc.relation.ispartofINTERNATIONAL JOURNAL OF COAL GEOLOGYen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectcoalen_US
dc.subjectSchmidt hammeren_US
dc.subjectroof pressureen_US
dc.subjectcoal hardnessen_US
dc.subjectshield supporten_US
dc.subjectlongwallen_US
dc.titleDetermination of the effect of roof pressure on coal hardness and excavation productivity: an example from a Cayirhan lignite mine, Ankara, Central Turkeyen_US
dc.typeArticleen_US

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