Abstract
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
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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.
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The dynamic process of rock damage and stress-wave propagation is studied for synchronous cutting by an AWJ and a disc cutter.
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The rock-breaking characteristics of the single-cutter cutting mode, the precutting kerf mode, and the synchronous cutting mode are comprehensively compared.
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The influence of the AWJ kerf depth and the spacing between the disc cutter and the jet on the rock-breaking performance are investigated.
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Data Availability
The data that support the findings of this study can be available from the corresponding author upon reasonable request.
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Acknowledgements
This work is supported by the Science and Technology Major Project of Ministry of Water Resources of China (SKR-2022029), the China Postdoctoral Science Foundation (No. 2022TQ0378) and the Fundamental Research Funds for the Central Universities of Central South University (No. 2023ZZTS0648). We are grateful to the High Performance Computing Center of Central South University for assistance with the computations.
Funding
This study was funded by the China Postdoctoral Science Foundation (Grant No. 2022TQ0378) and the Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2023ZZTS0648).
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Yang, G., Zhang, J., Yang, F. et al. Research on the Features of Synchronous Cutting of Granite by Abrasive Water Jet and Disc Cutter. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03770-4
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DOI: https://doi.org/10.1007/s00603-024-03770-4