This study examines the effect of variations of the rock property and TBM parameters on the cutter failure. A new disc cutter wear model is developed by coupling Archard’s model and TBM cutter kinematics. The rock property and the TBM parameters are modelled as anisotropic cross-correlated log-normal random fields. The proposed model with a discretized algorithm allows a quantitative evaluation of the possible cutter failure during the TBM tunneling. The failure of the cutter head system is characterized by a random failure pattern and its failure can be evaluated using a probability method. With this technique, it can be a useful tool in providing an indication for the cutters replacement. Both the cutter and its mechanical system life are determined based on their allowed working distance of the TBM at the targeted safety level. The obtained results indicate that the life of the cutters and its cutter head system decreases with the presence of rock spatial heterogeneity. Finally, the obtained attenuation factors incorporating different randomness levels is practically useful for the evaluation of the cutter life.

中文翻译：

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硬岩TBM掘进过程中空间变化对圆盘刀具失效的影响

本研究检验了岩石特性和 TBM 参数的变化对刀具失效的影响。结合 Archard 模型和 TBM 刀具运动学，开发了一种新的盘式刀具磨损模型。岩石特性和 TBM 参数被建模为各向异性互相关对数正态随机场。所提出的带有离散算法的模型允许对 TBM 掘进过程中可能的刀具故障进行定量评估。刀盘系统的故障以随机故障模式为特征，其故障可以使用概率方法进行评估。使用这种技术，它可以成为一种有用的工具，可以为刀具更换提供指示。刀具及其机械系统寿命均根据其在目标安全水平下允许的 TBM 工作距离来确定。所得结果表明，随着岩石空间非均质性的存在，刀具及其刀盘系统的寿命降低。最后，获得的包含不同随机性水平的衰减因子对于评估刀具寿命非常有用。