正、偏楔形盘形滚刀破岩作业载荷对比研究

盘形滚刀是全断面岩石掘进机(TBM)上的关键核心部件,其与岩石的相互作用直接影响TBM的掘进效率和工程成本。研究发现盘形滚刀外形对其与岩石的相互作用有较大影响。论文首先建立了正楔形盘形滚刀作业对象岩石的Drucker-Prager弹塑性模型和正楔形盘形滚刀与其相互作用模型,并用罗科斯巴勒盘形滚刀破岩力预测理论对所建模型进行了验证;以此为基础,论文还建立了偏楔形盘形滚刀与其作业对象岩石的相互作用模型,并分别模拟研究了正楔形盘形滚刀和偏楔形盘形滚刀与岩石的相互作用,从而发现正楔形盘形滚刀在不同安装半径和切深条件下的垂直力、侧向力和滚动力都大于偏楔形盘形滚刀,且偏楔形盘形滚刀在小安装半径和大切深条件下,其破岩载荷较正楔形盘形滚刀减小量较大。论文研究结论为偏楔形盘形滚刀设计理论的工程应用提供了重要参考。

Loads comparisonstudy on rock breaking operation of normal and partial wedge-shaped disc cutter

Disc cutter is the key component of Full Face Rock Tunnel Boring Machine (TBM),and the interaction between rock and disc cutter directly affects the tunneling efficiency and engineering cost of TBM. It is found that theshape of disc cutter has great influence on its interaction with rock. Firstly, the working objects of normal wedge-shaped disc cutter, the Drucker-Prager elastic-plastic model of rock and its interaction model with normal wedge-shaped disc cutter, were presented, and the models were verified by the prediction theory of rock breaking force of the disc cutter established by Roxborough and Phillips. Based on the above, the interaction model between partial wedge-shaped disc cutter and its working object-rock was proposed. The interaction between normal wedge-shaped disc cutter and rock and the interaction between partial wedge-shaped disc cutter and rock weresimulated respectively. It is found that the normal force, side force and tangential force of the normal wedge-shaped cutter are greater than those of the partial wedge-shaped cutter in the conditions of different installation radius and cutting depth, and the partial wedge-shaped cutter has a larger reduction in the rock breaking force than normal wedge-shaped cutter in the conditions ofsmall installation radius and the large cutting depth. The conclusions of the paper can provide an important reference for the engineering application of the design theory of the partial wedge-shaped cutter.