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Laboratory Experimental Study on the Wear of EPB Shield Cutting Tools in Sandy Stratum
(1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031;2 China Railway 14th Bureau Group Mega Shield Construction Engineering Co., Ltd., Nanjing 211800)
Abstract In order to explore the wear law of earth pressure balance (EPB) shield cutting tools, indoor tests are car? ried out with self-made test equipment simulating the shield driving process, and the rules of the influence of installation orientation, quartz particle content and conditioner content on cutter wear are analyzed by means of microscopic observation and statistical analysis of wear-induced mass loss. The results show that: in the wear process of cutters, the installation orientation of cutters affects the wear condition; there is a positive correlation between the surface wear form, the wear-induced mass loss and the installation radius, the quartz particle content; and adding conditioner can effectively reduce the wear-induced mass loss of cutters and mitigate the development of cutter surface wear. In view of the above rules, the Rabinowicz micro-cutting model is modified, by which the correction coefficient of cutting direction and the reduction coefficient of conditioner are introduced to consider the wear difference between the front and back of cutters as well as the influence of ground pre-treatment respectively, and the abrasive wear coefficient is analyzed in detail to obtain the modified prediction formula of cutter wear-induced mass loss of EPB shields, which can provide reference for related research and practical engineering.
Abstract：
In order to explore the wear law of earth pressure balance (EPB) shield cutting tools, indoor tests are car? ried out with self-made test equipment simulating the shield driving process, and the rules of the influence of installation orientation, quartz particle content and conditioner content on cutter wear are analyzed by means of microscopic observation and statistical analysis of wear-induced mass loss. The results show that: in the wear process of cutters, the installation orientation of cutters affects the wear condition; there is a positive correlation between the surface wear form, the wear-induced mass loss and the installation radius, the quartz particle content; and adding conditioner can effectively reduce the wear-induced mass loss of cutters and mitigate the development of cutter surface wear. In view of the above rules, the Rabinowicz micro-cutting model is modified, by which the correction coefficient of cutting direction and the reduction coefficient of conditioner are introduced to consider the wear difference between the front and back of cutters as well as the influence of ground pre-treatment respectively, and the abrasive wear coefficient is analyzed in detail to obtain the modified prediction formula of cutter wear-induced mass loss of EPB shields, which can provide reference for related research and practical engineering.
CHEN Yan1 WANG Yuhao1 FANG Yong1 XU Gongyun1 ZHOU Kaige1 LIU Sijin2
.Laboratory Experimental Study on the Wear of EPB Shield Cutting Tools in Sandy Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(5): 159-166
2021, Vol. 58 