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  Research on Vibration Characteristics of TBM Disc Cutters Based on DEM

  As a large-scale machine for rapid excavation of tunnels with complicated rock conditions and construction techniques, the tunnel boring machine (TBM) often encounters evident vibration phenomenon. This vibration is generally irregular and has many adverse effects on cutter life, advancing speed and tunneling efficiency. To study the vibration problem of TBM in excavation, the rock cutting process was simulated by the discrete element method (DEM). A 19-inch constant cross-section disc cutter model was established, as well as a larger-size rock sample model. The cutting process at different penetrations and cutter spacing were simulated. The acceleration signal was normalized to be processed by the Fast Fourier Transform Algorithm. The analysis results indicate that the penetration and cutter spacing have significant influences on the cutter vibration. The dominant frequency increases as the penetration increasing. The interconnects of rock particles break completely at 6mm. Then with the increases of penetration, the vibration of cutter gets no more severe. With larger spacing, the vibration gets more severe. But the efficiency of rock cutting can be improved. The exaggerated spacing has little influence on the vibration of the cutter. By adjusting the optimum cutter spacing, the influence of the vibration can be reduced.

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