中南大学学报（自然科学版）2011，Vol.42Issue(4)：954-959,6.
盾构刀具破岩过程及其切削特性
Rock fragmentation process and cutting characteristics on shield cutter
摘要
Abstract
By means of simulating technology and functional finite element method, the nonlinear elastic-plastic constitutive model was chosen as the material model of soft rock based on the Ottosen four parameters failure criterion by introducing the damage factor. A simplified 2-D finite element model to simulate cracks generation and propagation in the cutting process was developed using finite element analysis. By building a 3-D finite element model, the change of cutting force during the whole cutting process was analyzed. The feasibility and effectiveness of the method were also verified by experiment. The influence and tendency of tool geometry and cutting parameters in cutting force were analyzed by finite element method. The results show that the fragmentation process of rock or chip formation is caused by the propagation of tensile and shear cracks. The cutting force and time follow a fluctuation variable relationship,which reflects the dynamic fragmentation response process of soft rock in fragmentation by shield cutter in practical. It provides reference for the further optimization design of shield cutter.关键词
刀具/破岩过程/切削参数/有限元分析Key words
cutter/ rock fragmentation process/ curing parameters/ finite element analysis分类
信息技术与安全科学引用本文复制引用
夏毅敏,薛静,周喜温..盾构刀具破岩过程及其切削特性[J].中南大学学报（自然科学版）,2011,42(4):954-959,6.基金项目
国家重点基础研究发展计划("973"计划)项目(2007CB714002) （"973"计划）
国家自然科学基金资助项目(51074180) （51074180）
中国博士后科学基金特别资助项目(201003519) （201003519）
湖南省科技重大专项(2010FJ1002) （2010FJ1002）
长沙市科技重大专项(K1003149-11) （K1003149-11）
湖南省博士后基金资助项目(2009RS3023) （2009RS3023）
