Study on Rock-Breaking Efficiency and Adaptability of Wedge Tooth Cutters in Complex Formations

Hongbin Liu; Tao He; Jun Li; Hanjun Liu; Changwei Zhou

doi:10.54691/9dqekm15

Authors

Hongbin Liu
Tao He
Jun Li
Hanjun Liu
Changwei Zhou

DOI:

https://doi.org/10.54691/9dqekm15

Keywords:

Wedge Tooth Cutter; Composite Formation; Formation Dip Angle; Rock Breaking Efficiency; Parameter Matching.

Abstract

In composite strata, the excavation efficiency of tunnel boring machines (TBMs) is significantly influenced by the morphology of stratigraphic interfaces. This study employs the Abaqus explicit dynamics module to establish an interaction model between wedge-toothed cutterheads and composite strata, investigating the matching relationship between stratigraphic inclination (15°–60°) and cutterhead parameters (tooth diameter, tooth count, penetration resistance, rotational speed). Results indicate that the specific rock-cutting energy exhibits a V-shaped variation with stratum inclination, first decreasing and then increasing, with optimal efficiency at a 45° inclination. Stress fluctuations decrease by 18.9%, and rock is more prone to tensile-shear combined fracturing. Analysis of variance reveals penetration depth remains a highly significant factor, while the significance of tooth diameter and tooth count increases with inclination. Based on these findings, this study proposes a synergistic parameter optimization strategy: for low inclinations, a combination of small tooth diameter, high tooth count, low penetration rate, and medium rotation speed is recommended; for high inclinations, a combination of large tooth diameter, low tooth count, high penetration rate, and low rotation speed is preferred. This research provides a theoretical foundation for selecting TBM cutters and optimizing excavation parameters in complex geological formations.

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