Loading and Dynamic Character Analysis of Tbm Cutterhead-Cutter System Considering Contact-Vibration Coupling

Abstract

The cutter-rock frictional contact during TBM operation significantly affects cutterhead loads and induces severe vibrations. In this study, a coupled particle flow discrete element–multi-body dynamics model was developed to dynamically link rock-cutter interaction and cutterhead vibration. Results show that increased rock strength, penetration depth, or rotation speed amplifies cutting forces and system vibrations. The damping effect at the cutter-rock interface plays a crucial role in vibration attenuation. Compared with circular-top cutters, flat-top cutters, due to larger contact areas and greater rock powder generation, exhibit stronger damping behavior and lower vibration intensities under equivalent loading. The unified model enables simultaneous acquisition of rock-breaking, load, and vibration data, providing a reliable basis for TBM service state evaluation.

Keywords: Tunnel boring machine, disc cutter, frictional contact induced vibration, loading characteristic