盾构刀盘掘进载荷的数值模拟  

Numerical Simulation of Excavation Load on Cutterhead in Shield Tunneling Machine

作　　者：苏翠侠[1] 王燕群[1] 蔡宗熙[1] 亢一澜[1] 黄田[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《天津大学学报》2011年第6期522-528,共7页Journal of Tianjin University(Science and Technology)

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA041804);国家重点基础研究发展计划(973计划)资助项目基金项目:(20060056005)

摘　　要：刀盘是盾构机的关键部件,研究掘进过程中刀盘与界面耦合作用下动态载荷分布是刀盘设计的基础.应用有限元法建立了模拟刀盘掘进的三维分析模型,采用扩展的Drucker-Prager非线性弹塑性模型作为土体的本构模型,应用包含单元删除功能的损伤失效准则模拟切屑的形成及分离,实现了盾构刀盘掘进过程的直接数值模拟,得到了刀盘系统切削载荷随掘进时间的变化曲线以及沿刀盘径向的分布曲线.研究发现,掘进初始阶段刀盘上刀具切削载荷沿径向增大且变化较大,稳定后则沿径向变化较小;刀盘扭矩自初始阶段逐渐增加到1,800,kN.m后保持稳定不变,总体变化趋势与实际相符.Cutterhead is the most important component of shield tunneling machine.The fundamental problem for the design of cutterhead is the dynamic load distribution on the excavation face during tunneling process.Finite element method（FEM） was used to simulate the interaction between cutterhead and excavation face in tunneling process,in which a 3D cutterhead model was established,and the extended Drucker-Prager elastoplastic model was selected for the soil concerning its material nonlinearity.During the excavating simulation,soil cutting including cutting scrap formation and cutting scrap separation was simulated by using the progressive damage and failure rules,which con-tain element delete function.Based on the above established models the interaction between cutterhead and excavation face was simulated and the cutting load distribution of cutterhead was analyzed.The results show that the cutting load distribution of cutterhead increases apparently in the radial direction at the beginning of the excavation and then the change is smaller.The torque increases significantly to 1 800 kN.m at first and then keeps stable,which is consis-tent with the engineering practice.

关 键 词：盾构机 刀盘 载荷分布 数值仿真 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] U455.3[自动化与计算机技术—计算机科学与技术]