Study on the rock-breaking characteristics of linear cutting by a hob under a free-face generated by a water jet

被引：0
|
作者：
Zhang X. [1 ]
Tan T. [1 ]
Zhong K. [1 ]
Long J. [1 ]
Xia Y. [2 ]
机构：
[1] College of Engineering and Design, Hu′nan Normal University, Changsha
[2] College of Mechanical and Electrical Engineering, Central South University, Changsha
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2024年 / 45卷 / 02期
关键词：
cutting width; finite element simulation; free face; hob; rock cutting; rock-breaking efficiency; rock-breaking force; water jet;
D O I：
10.11990/jheu.202206065
中图分类号：
学科分类号：
摘要：
To examine the rock-breaking characteristics induced by the hob under a free-face condition caused by a water jet, a rock-breaking model of the hob under a free-face condition was developed based on the finite element simulation method, and the rock-cutting process of the hob under different-cutting widths was simulated, achieving the variation laws of rock-breaking force and rock-breaking state under the free-face condition caused by the water jet. The simulation was confirmed by the linear-cutting experiment. The findings revealed that the cutting process of the hob may produce tensile cracks on the surface and inside the rock sample under the free-face condition generated by the water jet. When the cutting width is less than the critical value of 50 mm, the tensile cracks near the free face can extend to the free face and advance rock fragmentation. For cutting rock under the free-face condition produced by the water jet, the vertical force of the hob is the largest and the lateral force is the smallest, and the suitable cutting width can remarkably enhance the cutting force of the hob. When the hob can effectively utilize the free face to break the rock, the specific energy consumption is much lower than that without the free surface effect. The former is only about 30% of the latter, and the rock-breaking efficiency is significantly enhanced. This work offers guidance for designing rock-breaking parameters in the rock-breaking process assisted by water jets. © 2024 Editorial Board of Journal of Harbin Engineering. All rights reserved.
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页码：367 / 374
页数：7
相关论文
共 15 条
  • [1] LIN Laikuang, XIA Yimin, WU Dun, A hybrid fuzzy multiple criteria decision-making approach for comprehensive performance evaluation of tunnel boring machine disc cutter [ J], Computers & industrial engineering, 149, (2020)
  • [2] YANG Mei, JI Zhiyong, ZHANG Ling, Et al., A hybrid comprehensive performance evaluation approach of cutter holder for tunnel boring machine, Advanced engineering informatics, 52, (2022)
  • [3] HONG Kairong, DU Yanliang, CHEN Kui, Et al., Full-face tunnel boring machines(shields / TBMs) in China: history, achievements, and prospects, Tunnel construction, 42, 5, pp. 739-756, (2022)
  • [4] LIU Jianqin, BIN Huaicheng, GUO Wei, Load characteristics of the TBM cutterhead under mixed-face rock ground condition, Journal of Harbin Engineering University, 39, 3, pp. 575-583, (2018)
  • [5] ZHANG Kui, YANG Chang, CHEN Chunlei, Et al., Scale model test on laser-assisted rock indentation by TBM disc cutter indenter, Rock and soil mechanics, 43, 1, pp. 87-96, (2022)
  • [6] LU Gaoming, LI Yuanhui, HASSANI F, Et al., The influence of microwave irradiation on thermal properties of main rock-forming minerals, Applied thermal engineering, 112, pp. 1523-1532, (2017)
  • [7] CHENG Jianlong, JIANG Zihao, HAN Weifeng, Et al., Breakage mechanism of hard-rock penetration by TBM disc cutter after high pressure water jet precutting [ J ], Engineering fracture mechanics, 240, (2020)
  • [8] CICCU R, GROSSO B., Improvement of disc cutter performance by water jet assistance, Rock mechanics and rock engineering, 47, 2, pp. 733-744, (2014)
  • [9] CHENG Jianlong, WANG Yongxing, WANG Lianguo, Et al., Penetration behaviour of TBM disc cutter assisted by vertical precutting free surfaces at various depths and confining pressures, Archives of civil and mechanical engineering, 21, 1, pp. 1-18, (2021)
  • [10] XU Futong, LU Jingjing, ZHOU Hui, Et al., Research on combined rock-breaking mode of pre-cutting groove and TBM mechanical cutter, Rock and soil mechanics, 42, 5, pp. 1363-1372, (2021)
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