TBM滚刀刃形对刀-岩接触损伤行为影响机理研究  

Effects of TBM cutter profile on cutter-rock contact and damage behaviors

作　　者：勾斌 段文军[2,3] 莫继良 张蒙祺[1,2] GOU Bin;DUAN Wenjun;MO Jiliang;ZHANG Mengqi(Tribology Research Institute,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Tribological Design Laboratory of Shield/TBM Equipment,Southwest Jiaotong University,Chengdu 610031,China;China Railway Hi-Tech Industry Co.,Ltd.,Beijing 100070,China)

机构地区：[1]西南交通大学机械工程学院摩擦学研究所,成都610031 [2]西南交通大学盾构/TBM装备摩擦学设计实验室,成都610031 [3]中铁高新工业股份有限公司,北京100070

出　　处：《重庆理工大学学报（自然科学）》2022年第12期269-280,共12页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金项目(52005419);中国博士后科学基金项目(2019M663898XB);四川省重点研发项目(21ZDYF3658);成都市重大科技创新项目(2019-YF08-00100-GX)。

摘　　要：使用颗粒流离散元-有限差分混合模型对全断面隧道掘进机(TBM)盘形滚刀破岩过程进行了数值仿真研究,针对工程实际中最常用的2种刃形的TBM滚刀,即平顶滚刀和圆顶滚刀,探究了滚刀截面形状(即刃形)对刀-岩接触损伤行为产生影响的机理和规律。结果表明:所采用模型对可能发生损伤破坏的岩石区域使用颗粒流离散元法建模,而远离滚刀-岩石接触区的岩体使用基于连续介质力学的有限差分模型建模,可以在不影响计算精度的前提下有效地降低滚刀破岩仿真耗时。圆顶滚刀与岩石之间的接触区域和应力集中范围较小,使得在相同的切削深度下,圆顶滚刀所需的切削力更低;但圆顶滚刀裂纹扩展能力相对较弱,导致产生的岩石碎片体积有所减小。基于切削力和破岩体积两个参数计算了比能,发现圆顶滚刀的比能较低,表明形成单位体积的岩石碎片时,圆顶滚刀所需的能量更少。开展缩比滚刀破岩实验对仿真结果进行了定性证明。关于滚刀刃形对其破岩性能影响机理的研究可为TBM滚刀的研发和使用提供实际指导。Numerical simulations are performed by using a particle flow discrete element-finite difference hybrid model to study the rock cutting process of disc cutters of tunnel boring machine(TBM).The two most used TBM cutters,flat-top cutter and circular-top cutter,are considered in the study,and the mechanism of the influence of the cross-section profile of the cutters on the rock fracture is explored.The results show that,in the hybrid model,the rock where damage may occur is modeled by the particle flow discrete element method,and finite difference method based on continuum mechanics is used to model rock parts far away from the cutter-rock contact area,which can effectively reduce the simulation time of rock cutting process without affecting the calculation accuracy.The contact area and the stress concentration range between the circular-top cutter and the rock are small,so that the cutting force of the circular-top cutter is lower at the same cutting depth,but the crack propagation ability is relatively weak,and the volume of rock fragments produced in the cutting decreases.Finally,specific energy is calculated on the basis of cutting force and rock cutting volume,of which the specific energy of the circular-top cutter is low,implying it requires less energy when a unit volume of rock fragments forms.The validity of the simulation results is qualitatively verified through a scaling rock cutting experiment.The research on the effects of cutter profile on rock-cutting performance can provide practical guidance for the development and application of TBM cutters.

关 键 词：全断面隧道掘进机 盘形滚刀 数值仿真 颗粒流离散元法 破岩性能 

分 类 号：TH122[机械工程—机械设计及理论]