The multi-stage rock fragmentation load prediction model of tunnel boring machine cutter group based on dense core theory

Disk cutter is a working part of the tunnel boring machine (TBM), which is directly in contact with the rock, bearing a strong impact load and vibration, so the structure is very easy to have damage and failure. The accurate prediction of the cutter group load is the key to structure design of cutters. However, the existing prediction model cannot reflect the multi-peak characteristics in the breaking process. In this paper, a theoretical...