首页|Load Characteristics and Optimal Layout of Center and Gage Cutters of Rock Formation Compound Tunnel Boring Machine
Load Characteristics and Optimal Layout of Center and Gage Cutters of Rock Formation Compound Tunnel Boring Machine
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The cutter layout of a full-face tunnel boring machine(TBM)directly affects its tunneling efficiency.The revolving diameter of the center cutter is small,and the double-edged design results in its rock breaking mechanism and force characteristics being significantly different from those of the single-edged cutter.The gage cutter is installed on the transition arc of the cutterhead,and the installation inclination complicates its movement and force.In this paper,by taking sandstone as the research object,the composite rock breaking models of the center cutter group and the gage cutter group of a compound TBM are separately established based on the three-dimensional particle discrete element method.The numerical models are verified by comparing results with the full-scale rotary cutting laboratory test.From the view point of the force characteristics of a single cutter,the propagation of rock cracks between adjacent cutters,the overall mechanical properties of the cutterhead,the load characteristics and layout form of the double-edged center cutter,and the installation angle range of the gage cutter were studied.Results demonstrate that the use of a cross-shaped center cutter layout can reduce the force of a single cutter ring and the overall load of the cutterhead,which is conducive to TBM stability during tunneling.Therefore,it is recommended that a cross-shaped layout for the double-edged center cutter of a rock formation compound TBM should be used.To improve the stability and service life of the cutter,we recommend setting the installation angle of the innermost gage cutter of the rock formation compound TBM to about 9°,and the installation angle of the outermost gage cutter should not exceed 70°.
center cuttergage cutterload characteristicslayout forminstallation angleparticle flow
张康健、胡哲钏、张志强
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Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Chengdu 610031,China
School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China
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维普
