An analytical model for predicting the wear and life of TBM disc cutters based on the dense core effect
Chao Wang,Jinfeng Zou,Yichuan Zhu,Liang Li,Dan Shu
Abstract
The life prediction of hob cutters in tunnel boring machines (TBMs) during rock breaking has been a key issue affecting TBM boring efficiency and the timing of tool changes. By defining the service life of cutters during rock intrusion and introducing the dense core effect, an analytical method for the rock breaking force of disc cutters under the comprehensive failure mode of compression and shear was established. In addition, our work has improved Rabinowicz's abrasive wear model for predicting the wear rate and lifespan of TBM disc cutters. The engineering applicability and high precision of the prediction model were verified by comparing the predicted results with theoretical calculation results, numerical simulation results, and field monitoring data. The results indicate that the predicted values of the wear rate and lifespan of the hob cutter from the prediction models agree well with the measured values from the field. Compared with the existing models, the established model improves the prediction accuracy of the lifespan values by 7.63%, 64.15%, and 61.13%, respectively. This demonstrates the necessity of considering the dense core effect and the compression and shear failure mode in TBM rock breaking calculations. The evaluation method presented in this work can provide theoretical guidance for the design of timing and tool change plans for TBM tunnels and other similar projects.
Key Words
compression and shear failure mode; dense core effect; disc cutter; life of the hob cutter; Rabinowicz's abrasive wear model; rock breaking; tunnel boring machine (TBM)
Address
Chao Wang, Jinfeng Zou, Liang Li, Dan Shu — School of Civil Engineering, Central South University, No. 22 Shaoshan South Road, Tianxin District, Changsha 410075, People's Republic of China
Yichuan Zhu — Department of Civil & Environmental Engineering, Temple University, 1947 N. 12th Street, Philadelphia, 19122, PA, The United States of America
PDF Viewer
Preview is limited to the first 3 pages. Sign in to access the full PDF.
