Numerical simulation of rock fragmentation efficiency of TBM disc cutter under different lateral pressure coefficient and rock strength
WEN Sen1,2, WU Fei1, LI Sheng1, ZHANG Luomeng1
1. Institute of Geotechnical and Rail Transit Engineering, Henan University, Kaifeng 475004, Henan, China; 2. Henan Provincial Research Center of Engineering on Intelligent Construction of Rail Transit, Kaifeng 475004, Henan, China
Abstract PFC3Dwas used to simulate the rock fragmentation of five kinds of rocks with different strength under different lateral pressure coefficient, cutter spacing and penetration. In the numerical simulation, the crack propagation diagram of the rock fragmentation process was recorded and the normal force, rolling force and the number of particles damaged in the rock fragmentation process of the disc cutter under different working conditions were monitored. Through the crack propagation analysis and the calculation of the rock fragmentation specific energy of the disc cutter under different working conditions, the following conclusions were obtained: the crack propagation diagram showed that there was an optimal s/p in the rock fragmentation process of the disc cutter(s and p were the cutter spacing and penetration, respectively); With the increase of lateral pressure coefficient, the efficiency of rock fragmentation decreased; When the lateral pressure coefficient was 0.8, 1.0, 1.2 and 1.6, the rock fragmentation efficiency of disc cutter was high when s/p=10; When the lateral pressure coefficient was 1.4, the rock fragmentation efficiency was high at s/p=12.5.
WEN Sen,WU Fei,LI Sheng, et al. Numerical simulation of rock fragmentation efficiency of TBM disc cutter under different lateral pressure coefficient and rock strength[J]. Hazard Control in Tunnelling and Underground Engineering,
2021, 3(4): 9-19.
