Abstract
Tunnel boring machine (TBM) is a large-scale tunnel engineering equipment, which has unparalleled advantages in safety and work efficiency. The cutter is subjected to complex and variable random impact loads, resulting in damage to bearings, cutter rings, and cutter shafts. Therefore, based on the discrete element simulation platform and experiment, this paper established the cutter rock simulation model based on the experimental data, and analyzed the rock breaking process, cutter load magnitude, and variation law. The research results show that when the cutter pole diameter decreases from 200 mm, 100 mm, and 0 mm in sequence, the rolling force increases accordingly, and the maximum increase of the rolling force is 56%. Meanwhile the lateral force decreases and the maximum average decrease value is 26%. Moreover, the rolling force showed a downward trend with the increase of the cutter spacing. When the cutter spacing is increased from 80 mm to 120 mm, the average rolling force decreases by 51%, and the maximum value rises slightly, increasing by 2%. And, the lateral force tends to increase, with an increase of 17% and the maximum lateral force value increase was 29%. The results can provide load input reference for TBM cutter layout, cutterhead structure design, and performance evaluation.
Highlights
Tunnel boring machine (TBM), it is a new, advanced large-scale high-end tunnel engineering equipment, which uses a rotary cutter to excavate and break the surrounding rock in the cave to form a complete rock tunnel
When the pole diameter is reduced from 100 mm to 0 mm, the average rolling force increases by 0.42 kN, an increase of 6%, and the maximum value increases by 7.03 kN, an increase of 32%
(2) A numerical simulation of rock breaking with a single cutter was carried out and it was found that the rolling force increased with the decrease of the cutter pole diameter
Summary
Tunnel boring machine (TBM), it is a new, advanced large-scale high-end tunnel engineering equipment, which uses a rotary cutter to excavate and break the surrounding rock in the cave to form a complete rock tunnel. TBM is widely used in water conservancy and hydro-power, municipal administration, high-speed railway tunnels, and national defense. It has the advantages of fast, high quality, safety, economy, and environmental protection. The key core components of TBM mainly rely on imports. Domestic manufacturers provide geological information to foreign manufacturers and design by foreign companies. They only manufactures and assembles certain structural components in China. There is an urgent need to absorb and digest its key core technologies, break foreign monopolies, and achieve domestic production.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
