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http://dx.doi.org/10.7474/TUS.2022.32.4.243

Application of Rotary Cutting Test for Performance Assessment of Tunnel Boring Extender  

Jeong, Hoyoung (Department of Energy Resources Engineering, Pukyong National University)
Jeon, Seokwon (Department of Energy Systems Engineering, Seoul National University)
Cho, Jung-Woo (Korea Institute of Industrial Technology)
Publication Information
Tunnel and Underground Space / v.32, no.4, 2022 , pp. 243-253 More about this Journal
Abstract
In this study, the cutting efficiency of TBE (Tunnel Boring Extender) was evaluated by using rotary cutting tester. In the rotary cutting test, a specimen which has a drilled hollow hole at the center was made of rock-like material. The specimen was cut by UDC (undercutting disc cutter) with spiral cutting path to simulate the cutting process of TBE. The cutting forces and specific energy were evaluated under different cutting conditions. The results indicated that the cutter forces of UDC linearly increased with the vertical and radial penetration depths. Among the three directional cutter forces, the normal force is larger than other force components. While the specific energy decreased with the two penetration depths, in particular, it was presumed that the specific energy was minimized at a certain value of the ratio of radial to vertical penetration depth.
Keywords
Rotary cutting test; TBE (Tunnel Boring Extender); Undercutting; Cutting efficiency;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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