文献类型：期刊文献

英文题名：Comparative study on fragmentation mechanism of the rock under the spherical tooth cutters and constant cross section cutters assisted by vibration with different frequencies

作者：Minwei, Lu[1]; Bolong, Liu[1,2]; Haowen, Ruan[1]; Hao, Chen[1]; Yubo, Guo[1]; Song, Wang[1]; Yu, Zeng[1]; Fawen, Song[1]; Qin, Li[1]; Kaiyuan, Chen[1]

机构：[1] State Key Laboratory of Intelligent Deep Mental Mining and Equipment, Shaoxing University, Shaoxing, 312000, China; [2] College of Civil and Architectural Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China

年份：2025

卷号：327

外文期刊名：Engineering Fracture Mechanics

收录：EI(收录号：20253218958870)、Scopus(收录号：2-s2.0-105012756554)

语种：英文

外文关键词：Cementing (shafts) - Cutting - Cutting machines (mining) - Cutting tools - Rock bursts - Rocks - Tunneling machines - Vibrations (mechanical)

外文摘要：To improve tunneling efficiency of tunnel boring machines (TBMs) in complex rock formations, vibration-assisted cutting technology was proposed in the present study. A series of tests were carried out on the self-designed vibration-assisted TBM rotary cutting machine. The influence of frequency on the forces acting on the cutters, microstructures of the cutting grooves, fragmentation modes of sandstone by spherical tooth cutters and constant cross section (CCS) cutters and cutting efficiency of cutters were investigated. Results show that spherical tooth cutters maintain stable normal force with increasing frequency, while torque is minimized at 20 Hz. Normal force and torque acting on CCS cutters reduce significantly at 40-50 Hz. Vibration promotes the breakdown of mineral cementation and expands crushed zones, especially for spherical tooth cutters. Additionally, vibration transforms rock fragmentation from inside of the groove to both sides, with more uniform fragments observed for CCS cutters. Cutting efficiency peaks at 20–30 Hz, increasing by 61.3 % for spherical tooth cutters and 28.1 % for CCS cutters. These findings offer guidance for optimizing TBM cutting technologies in adverse geological conditions. ? 2025