利用数值模拟估算TBM刀具磨损量的方法
A Method for Evaluating Wear of TBM Cutter's by Using Numerical Simulation

采用有限元方法建立滚刀与岩石相互做作用模型。模拟了单刀破岩过程中盘形滚刀的受力与运动情况。并依据体积磨损量与摩擦能量之间的关系建立方程,对刀具磨损量以及刀具寿命进行了估算。研究结果表明:利用数值模拟得到的垂直力、滑移量估算刀具使用寿命的方法可行;对于同一种地质条件,滚刀存在一个最佳贯入度使得磨损量最小;安装半径与刀盘转速的增大会使刀具磨损量增大;同条件下单轴抗压强度越大的岩石对刀具磨损越严重。
The interaction model between the disc cutter and the rock was established by using the finite element method. The forces and the slip displacement of a single disc cutter when breaking rock were obtained via numerical simulation. Based on the relationship between the abrasion loss of volume and the friction energy, an estimation method for predicting the wear content of cutter was proposed. The results show that it is feasible by using the numerical simulation method to obtain the vertical force and slip displacement and then to estimate the cutter's lifespan. The examples show that there is an optimal rate of penetration to leastly decrease the wear for the same geology condition. The increase in the radius of location and rotation speed will increase the wear of the cutter. The increase in the uniaxial compressive strength will also increase the wear of the cutter. The present results may provide a concise method to evaluate the wear, to predict the cutter's lifespan and to determine the period of changing cutters