Rock Breaking Performance of TBM Disc Cutter Assisted by High-Pressure Water Jet

Applied Sciences

Dapeng Zhou¹  Nanzhe Xiao²  Fengchao Wang²  Chuwen Guo²  Xin Zhou² 

[1] China Coal Technology Engineering Group Huaibei Blasting Technology Research Institute Limited Company, Huaibei 235099, China;School of Electrical & Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;

关键词: TBM;    high-pressure water jet;    disc cutter;    rock breaking mechanism;    numerical simulation;   

DOI  :  10.3390/app10186294

来源: DOAJ

【 摘 要 】

A high-pressure water jet can break rock efficiently, which is of great potential to overcome the problems of a tunnel boring machine (TBM) in full-face hard rock tunnel digging, such as low digging efficiency and high disc cutter wear rate. Therefore, this paper presented a new tunneling method that is a TBM coupled with a high-pressure water jet. The rock failure mechanism under the coupled forces of a disc cutter and water jet was analyzed at first. Then, the finite element method (FEM) and smoothed particle hydrodynamics (SPH) method were used to establish a numerical model of rock broken by the disc cutter and water jet. Effects of parameters on rock breaking performance were studied based on the numerical model. Moreover, an experiment of the water jet cutting marble was carried out to verify the reliability of the numerical simulation. Results showed that the high-pressure water jet can increase the TBM digging efficiency and decrease the forces and wear rate of the disc cutter. The optimum nozzle diameter is 1.5 mm, while the optimum jet velocity is 224.5 m/s in this simulation. The results can provide theoretical guidance and data support for designing the most efficient system of a TBM with a water jet for digging a full-face hard rock tunnel.

【 授权许可】

Unknown