Work

Experimental study on the influence of microwave parameters on the cutting performance of microwave-assisted TBM cutter mode

Year: 2026

Type: article

Abstract: To address the problem of low mechanical excavation efficiency for cutter in extremely hard rock, the rock-breaking influence law of microwave-assisted TBM cutter mode is investigated. Rock-breaking experiments using microwave pretreatment and small-scale cutters were conducted. The fragment size distribution, cutting forces, and energy efficiency for microwave-assisted cutter were analyzed. And the influence of microwave parameters on the rock-breaking performance has been researched. Results show that under an equivalent energy input of 900 kJ, the 3kW-5 min group achieved a 41.94% increase in rock-breaking volume and a 36.34% reduction in specific energy compared to the 1kW-15 min group. Evidently, the high-power, short-time scheme significantly outperforms the low-power, long-time alternative. Furthermore, the total specific energy index identified the 3kW-5 min combination as the optimal energy efficiency window, with a total energy consumption of 135.3 MJ/m³. And the normal and rolling forces reduced by 13.66% and 15.38%, respectively, relative to the untreated condition. The study provides a quantitative scientific basis for the parameter optimization of microwave-assisted cutter breaking rock system for TBM.

Source: KSCE Journal of Civil Engineering

DOI: 10.1016/j.kscej.2026.100672

Authors: Yimin Xia, Liaoyuan Xiao, Ju Wang, Mei Yang, Feng Gao

Institutions: Central South University, China Atomic Energy Authority, Beijing Research Institute of Uranium Geology, State Key Laboratory of Metal Mine Safety Technology

Language: English

Topic: Tunneling and Rock Mechanics

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,800