中文摘要：

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。

英文摘要：

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.