Replacing worn disc cutters in a tunnel boring machine (TBM) operation is a time-consuming and expensive process. This article presents the study of disc cutter wear rate during the excavation of 36 km Naqadeh water conveyance tunnel with a diameter of 6.325 m. The construction of this tunnel in northwest Iran has been recently completed. The geological setting of the tunnel consists of variable lithology, including limestone, shale, granite, and granodiorite units. Field data were collected and analyzed from TBM tunneling of 9.5 km of the tunnel. The analysis was performed by incorporating the types of wear and comparing the accuracy of traditional cutter wear prediction models. The new model was developed using statistical analysis of the observed cutter wear in this project. The validity of the proposed model was evaluated using the excavation data for the following 2 km of the tunnel. The model developed in this study allows estimating wear rate and cutter life using common rock characterization parameters such as the Cerchar abrasivity index (CAI) and the uniaxial compressive strength (UCS).

在隧道掘进机 (TBM) 操作中更换磨损的盘形刀具是一个耗时且昂贵的过程。本文介绍了直径为 6.325 m 的 36 km Naqadeh 输水隧道在开挖过程中盘式刀具磨损率的研究。这条位于伊朗西北部的隧道的建设已于近期完成。隧道的地质环境由可变岩性组成，包括石灰岩、页岩、花岗岩和花岗闪长岩单元。从隧道 9.5 公里的 TBM 隧道中收集和分析现场数据。该分析是通过纳入磨损类型并比较传统刀具磨损预测模型的准确性来进行的。新模型是使用该项目中观察到的刀具磨损的统计分析开发的。所提出的模型的有效性使用隧道以下 2 公里的开挖数据进行评估。本研究中开发的模型允许使用常见的岩石表征参数（例如 Cerchar 磨蚀性指数 (CAI) 和单轴抗压强度 (UCS)）来估计磨损率和刀具寿命。