Effects of the physico-mechanical properties of low-strength pyroclastic rocks on cutter wear of roadheaders

Basit Öğe Kaydı
dc.contributor.authorComakli, Ramazan
dc.date.accessioned2024-11-07T13:24:34Z
dc.date.available2024-11-07T13:24:34Z
dc.date.issued2019
dc.departmentNiğde Ömer Halisdemir Üniversitesi
dc.description.abstractConstruction projects that use mechanical excavators such as tunnel boring machines (TBM) or roadheaders generally result in high costs due to cutter wear. Cold storage caverns (CSC) are one area where roadheaders are used, but excavations of CSC5 show different characteristics than tunneling and mining excavations. The effects of the physico-mechanical properties of low - strength, pyroclastic rocks (tuffs) on the wear of roadheader cutters were investigated during the excavation of CSC5 in the Cappadocia region of Turkey. The excavated tuffs containing 13-19% quartz had low uniaxial compressive strength (UCS), ranging from 3.14 to 13.17 MPa. Field excavation performance parameters were continuously recorded for one week on two similar roadheaders and 14 different CSC5 projects. The average field cutter consumption rate (CCRField), defined as cutter material loss per excavation of 1 cubic meter rock, was calculated for each CSC. Physico-mechanical tests were performed on the rock samples collected from the CSC project areas. Additionally, sieve analyses were performed on the excavated rock materials to determine their coarseness index (CI) and mean particle size (d((50))). The calculated average CCR values were statistically analyzed with some physico-mechanical properties of rocks, in-situ Schmidt hammer hardness (SHHIn-situ), CI and d((50)). Negative correlations were found between CCR and each of the UCS values, Brazilian tensile strength (BTS), point load strength (I-s(50)), SHHIn-situ CI and d((50)), and a positive linear correlation was found only with the water contents of the rocks. All of these relationships were found to be dependent on crushing of the excavated materials in fine sizes, blockage of cutters by filling of the fine materials into the space between the holder and cutters and adherence of fine materials to the cutters and cutterhead, as affected by water/moisture and clay contents. This study, whose results apply to studies in the Cappadocia region of Turkey, showed that the CCRField of roadheaders decreased as the strength of rocks increased. These relationships specifically apply to easy-cutting tuffs with very low strength and high water content.
dc.description.sponsorshipScientific and Technological Research Council of Turkey [TUBITAK 217M171]
dc.description.sponsorshipA part of this study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK 217M171). The author greatly appreciates the HOYUK Construction Company for providing permission in the CSC projects and KEMPAR Company for their supports.
dc.identifier.doi10.1016/j.wear.2019.03.014
dc.identifier.endpage216
dc.identifier.issn0043-1648
dc.identifier.issn1873-2577
dc.identifier.scopus2-s2.0-85063131454
dc.identifier.scopusqualityQ1
dc.identifier.startpage205
dc.identifier.urihttps://doi.org/10.1016/j.wear.2019.03.014
dc.identifier.urihttps://hdl.handle.net/11480/14181
dc.identifier.volume428
dc.identifier.wosWOS:000471596300020
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Sa
dc.relation.ispartofWear
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241106
dc.subjectTungsten carbide bits
dc.subjectRoadheader
dc.subjectCold storage caverns
dc.subjectCutter wear
dc.subjectPhysico
dc.subjectMechanical properties
dc.titleEffects of the physico-mechanical properties of low-strength pyroclastic rocks on cutter wear of roadheaders
dc.typeArticle

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