{"title":"Disc cutter wear/life analysis in a long tunnel excavated in strong to very strong, abrasive rocks","authors":"Hajar Karimi, Mashalah Khamehchiyan, Jafar Hassanpour","doi":"10.1007/s10064-024-03900-w","DOIUrl":null,"url":null,"abstract":"<div><p>The complex interaction between the cutters and rocks in the tunnel face makes it difficult to predict the cutter wear, exactly. Therefore, many researchers have tried to study this process and introduce different ways to predict the wear extent of cutters and the number of cutters required to complete a mechanized tunneling project. In this study, in addition to investigating the effect of geological parameters on cutters wear/life, new empirical equations were proposed for predicting cutter wear/life, based on data collected from a long tunnel constructed in central parts of Iran, namely Kerman Water Conveyance Tunnel (KrWCT). The data collected from this project, including information related to cutter change stations, variations of geological parameters along the bored section of the tunnel, and actual machine’s operational and performance parameters, were compiled in a database and analyzed statistically. The results of statistical analyses revealed a significant relationship between the cutter wear/life and intact rock properties. Consequently, the proposed empirical prediction equations just employ two important intact rock properties, including rock strength (UCS) and Cerchar abrasivity index (CAI), as inputs. The results showed that the presence of discontinuities with moderate-wide spacing has a negligible effect on cutter consumption. These results also proved that models focusing only on rock abrasivity without considering the rock strength as an input will not provide an accurate assessment of the cutting tool wear. The new models are based on information from a wide range of igneous, pyroclastic, and sedimentary rocks with the UCS and CAI ranges of 50–250 MPa and 0.5-5.0, respectively.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 10","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Engineering Geology and the Environment","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10064-024-03900-w","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
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Abstract
The complex interaction between the cutters and rocks in the tunnel face makes it difficult to predict the cutter wear, exactly. Therefore, many researchers have tried to study this process and introduce different ways to predict the wear extent of cutters and the number of cutters required to complete a mechanized tunneling project. In this study, in addition to investigating the effect of geological parameters on cutters wear/life, new empirical equations were proposed for predicting cutter wear/life, based on data collected from a long tunnel constructed in central parts of Iran, namely Kerman Water Conveyance Tunnel (KrWCT). The data collected from this project, including information related to cutter change stations, variations of geological parameters along the bored section of the tunnel, and actual machine’s operational and performance parameters, were compiled in a database and analyzed statistically. The results of statistical analyses revealed a significant relationship between the cutter wear/life and intact rock properties. Consequently, the proposed empirical prediction equations just employ two important intact rock properties, including rock strength (UCS) and Cerchar abrasivity index (CAI), as inputs. The results showed that the presence of discontinuities with moderate-wide spacing has a negligible effect on cutter consumption. These results also proved that models focusing only on rock abrasivity without considering the rock strength as an input will not provide an accurate assessment of the cutting tool wear. The new models are based on information from a wide range of igneous, pyroclastic, and sedimentary rocks with the UCS and CAI ranges of 50–250 MPa and 0.5-5.0, respectively.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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