摘要
为了研究不同切削次序对TBM刀具破岩过程的影响,基于2D离散单元法,利用离散元仿真软件建立了无围压条件下三把TBM刀具按不同次序截割节理不发育岩石的仿真模型.在此基础上设计了一组数值试验,成功地模拟出了TBM刀具在切割岩石时,岩石裂纹生成、扩展和岩石破碎块形成的全过程.仿真结果表明:不同时加载时所需的刀具临界应力更大;同时加载和顺次加载时存在两种不同的破碎模式,虽然破碎区都由侧向裂纹交汇而成,但破碎块的形状有所不同;三种加载方式下,应力的分布规律较相似,且岩石应力场沿中心刀基本对称.
To research into the effect of different cutting orders on breaking mechanism of TBM cutter, this paper establishes the simulation models of breaking rock without joints by double TBM cutters in a simultaneous and sequential orders, which is based on the 2D discrete element method. A series of numerical experiments are designed and the whole process of production and propagation of crack and rock breaking is successfully simulated. The simulation results show that the cutter order determines the breaking mode. The distribution of the principal stress contour is almost symmetrical in the two cutting orders.
出处
《湖南工程学院学报（自然科学版）》
2011年第3期18-21,共4页
Journal of Hunan Institute of Engineering(Natural Science Edition)
基金
国家自然科学基金资助项目(51074180)
长沙市重大科技专项资助项目(K1003149-11)
关键词
切削顺序
TBM刀具
破碎模式
裂纹扩展
数值仿真
cutting order
TBM cutter
breaking mode
crack propagation
numerical simulation
