Study of the effect of penetration depth and disc speed on cutting forces using LS-DYNA simulations

Document Type : Research Article

Authors

1 Master's student in rock mechanics, Mining engineering department, Amirkabir university of technology

2 Mining Engineering, Amirkabir University, Tehran, Iran

3 Master of mechanical engineering-applied design, Director of research and development of Tunnelsaz machine

Abstract

The forces imparted upon cutting discs represent crucial design parameters for tunnel boring machines (TBMs) engaged in rock excavation processes. These forces comprise normal and rolling forces, which are influenced by factors including penetration depth, spacing, and linear and rotational velocity of the disc. Therefore, a careful examination of these forces is necessary for the design of effective TBMs. Linear cutting tests are time-consuming and financially prohibitive exercises. Consequently, precision numerical simulations can serve as a suitable alternative approach. In this report, the LS-DYNA software environment was employed to conduct simulations validating two constitutive models of concrete behavior: Johnson Holmquist (JHC) and RHT. The impact of variables such as penetration depth, and linear and rotational motion of the disc on exerted forces was investigated. The findings indicate penetration depth notably impacts both normal and rolling forces. Augmenting depth from 2.5mm to 7.6mm results in escalations of normal force from 96kN to 159kN and rolling force from 6.1kN to 22.5kN. As linear and rotational velocities of discs increase, forces decrease marginally. However, elevating linear speed from 0.33mm to 1.65mm precipitates merely a 13% reduction in normal force (from 155kN to 175kN) and 5% decrease in rolling force (from 20.6kN to 19.5kN), according to the results obtained.

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References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 12
March 2024
Pages 2487-2502

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