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Wear mechanism and life prediction of the ripper in a 9-m-diameter shield machine tunneling project of the Beijing new airport line in a sand-pebble stratum

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Deep Underground Science and Engineering 2022年第1期1卷 65-76页

作者： Hua Jiang Jiachen Zhu Xiaoyan Zhang Jinxun Zhang Hongliang Li Lingfeng Meng Department of Urban Underground Space School of Mechanics and Civil EngineeringChina University of Mining and TechnologyBeijingChina Post-Doctoral Research Center Beijing Urban Construction Group Co.Ltd.BeijingChina

Tool wear is a noteworthy problem in the process of shield tunneling,and the degree of wear varies with *** sand-pebble strata in Beijing are typically mechanically ***,many subways are buried wholly or partially in sand-pebble *** the Beijing New Airport line tunneling project as research background,this study evaluated the wear characteristics of the multiconfiguration rippers of a 9-m-diameter spoke-type shield tunneling machine in a sand-pebble *** wear values of five ripper teeth and ripper flanks were analyzed based on field-measured data from the Beijing New Airport line *** the analytical results show,the wear value generally increases as the installation radius enlarges with the rise of cutting trace *** wear of the 190-rippers was divided into five categories:pedestal wear,ripper teeth collapse,uniform wear,ripper teeth falling off and ripper flank *** wear of the ripper teeth and ripper flank wear were the two abrasion types of the *** teeth of the 155-rippers mostly maintained their cutting capacity under the protection of the 190-rippers.A wear prediction model of linear fitting field data was developed for a 190-ripper face to obtain the optimum shield driving distance in the sand-pebble *** average wear coefficients of the 190-ripper before and after replacement matched well,being 0.045 and 0.066 mm/km,*** results of this study provide a theoretical reference for tool wear prediction in shield construction under similar geological conditions.

关键词： 9-m-diameter shield long-distance shield driving optimum driving distance sand-pebble stratum tool wear wear prediction model

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维普期刊数据库

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Research on the design method for uniform wear of shield cutters in sand-pebble strata

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Deep Underground Science and Engineering 2024年第2期3卷 216-230页

作者： Jinxun Zhang Bo Li Guihe Wang Yusheng Jiang Hua Jiang Minglun Yin Zhengyang Sun Beijing Urban Construction Group Co. Ltd.BeijingChina China University of Geosciences BeijingChina China University of Mining and Technology BeijingChina

During shield tunneling in highly abrasive formations such as sand–pebble strata,nonuniform wear of shield cutters is inevitable due to the different cutting *** downtimes and cutter replacements have become major obstacles to long-distance shield driving in sand–pebble *** on the cutter wear characteristics in sand–pebble strata in Beijing,a design methodology for the cutterhead and cutters was established in this study to achieve uniform wear of all cutters by the principle of frictional *** applicability of the design method was verified through three-dimensional simulations using the engineering discrete element *** results show that uniform wear of all cutters on the cutterhead could be achieved by installing different numbers of cutters on each trajectory radius and designing a curved spoke with a certain arch height according to the shield *** the uniform wear scheme,the cutter wear coefficient is greatly reduced,and the largest shield driving distance is increased by approximately 47%over the engineering *** research results indicate that the problem of nonuniform cutter wear in shield excavation could be overcome,thereby providing guiding significance for theoretical innovation and construction of long-distance shield excavation in highly abrasive strata.

关键词： cutter wear EDEM model long-distance shield driving sand-pebble stratum shield tunnel uniform wear design method

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维普期刊数据库

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