不同地质工况条件下TBM刀具破岩模式研究  

Rock-breaking modes of TBM cutters under different working conditions

作　　者：张魁[1,2] 夏毅敏[1] 朱宗铭[1] 兰浩[1] 林赉贶[1] 暨智勇[1] 

机构地区：[1]中南大学现代复杂装备设计与极端制造教育部重点实验室,湖南长沙410083 [2]School of Engineering, University of Hull,Hull, HU6 7RX, UK

出　　处：《哈尔滨工程大学学报》2015年第9期1240-1245,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51074180);国家973基金资助项目(2013CB035401);国家863基金资助项目(2012AA041801);湖南省科技计划基金资助项目(2013GK3003);湖南省战略新兴产业重大科技攻关项目(2012GK4068);湖南省研究生科研创新项目(CX2011B089);中南大学贵重仪器设备开放共享基金资助项目(CSUZC2013013)

摘　　要：为了提高TBM刀具在不同地质工况下的适应能力以及破岩效率,针对岩土介质在刀具载荷作用下呈现的复杂应力场,考虑岩土介质的裂隙、节理及围压的耦合作用,基于离散元法,依次建立了单一特定地层下单刀切割含倾斜节理岩石、双刀切割节理不发育岩石以及含水平节理岩石的2D离散单元模型,观察到岩石在不同围压、节理参数、刀间距和切割顺序下微裂纹的演化过程,并根据裂纹扩展方向和破碎块的形成规则的不同,归纳出TBM刀具切割岩土时12种不同典型破碎形式,最终获得了破碎模式与具体工况的对应关系。通过分析比较可知,大部分破碎形态与文献试验观察到的宏观破碎现象具有良好的一致性。In order to improve the adaptability and efficiency of a TBM cutter under different working conditions,simulation models were established,based on the 2-D discrete element method,of a single cutter breaking rock with inclined joints,and double cutters breaking rock without joints or with horizontal joints under a certain single formation. Factors included the complicated stress fields of rock and soil media under the load of a TBM cutter,with the coupling effect between rock cracks,joints,and various confining pressures. Microcrack propagation under different confining pressures,parameters of joints,cutter spacing,and cutting orders,was observed. Based on the propagation direction of cracks and the formation pattern of fragments,12 typical types of breaking modes were established. Finally,the relationship between breaking modes and working conditions was obtained. Most of the modes obtained from this test are in good agreement with the macroscopic fragment phenomena captured by experimental observation in other literature.

关 键 词：TBM刀具 破岩模式 裂纹扩展 工况 围压 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] U455.31[自动化与计算机技术—计算机科学与技术]