부산대학교 도서관

When tunnel boring machines (TBMs) tunnel in extremely hard rock, it is difficult for the cutter to penetrate the rock, resulting in an excessive cutting load, severe wear, and a short lifespan. The rock-breaking mode of synchronous cutting by an abrasive water jet (AWJ) and a disc cutter is expected to improve the rock-breaking performance. To investigate the cutting features of the new method, a synchronous cutting model is established. The results demonstrate that synchronous cutting can significantly enhance the rock-breaking efficiency and reduce the cutting load compared to single-cutter cutting. Moreover, synchronous cutting results in superior rock-breaking effectiveness compared with precutting kerf cutting, attributed to the overlapping of stress waves. The influence of the AWJ kerf depth and the spacing between the disc cutter and the jet on the rock-breaking performance is studied. As the depth of the AWJ kerf increases and the spacing decreases, the cutting load decreases, while the range of rock damage and stress-wave propagation initially increase and then decrease. When the penetration depth of the cutter, kerf depth and spacing are 6 mm, 15 mm, and 30 mm, respectively, the cutting performance of the synchronous cutting is better than that under other conditions.
Highlights: A simulation model of the synchronous cutting of granite by an AWJ and a disc cutter is constructed based on the SPH–FEM coupled algorithm.The dynamic process of rock damage and stress-wave propagation is studied for synchronous cutting by an AWJ and a disc cutter.The rock-breaking characteristics of the single-cutter cutting mode, the precutting kerf mode, and the synchronous cutting mode are comprehensively compared.The influence of the AWJ kerf depth and the spacing between the disc cutter and the jet on the rock-breaking performance are investigated.