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不同岩石和围压下刃形对滚刀破岩性能的影响

张蒙祺 王一博 章龙管 段文军 苏叶茂 莫继良 周仲荣

张蒙祺, 王一博, 章龙管, 段文军, 苏叶茂, 莫继良, 周仲荣. 不同岩石和围压下刃形对滚刀破岩性能的影响[J]. 西南交通大学学报, 2023, 58(2): 332-339. doi: 10.3969/j.issn.0258-2724.20210171
引用本文: 张蒙祺, 王一博, 章龙管, 段文军, 苏叶茂, 莫继良, 周仲荣. 不同岩石和围压下刃形对滚刀破岩性能的影响[J]. 西南交通大学学报, 2023, 58(2): 332-339. doi: 10.3969/j.issn.0258-2724.20210171
ZHANG Mengqi, WANG Yibo, ZHANG Longguan, DUAN Wenjun, SU Yemao, MO Jiliang, ZHOU Zhongrong. Effects of TBM Cutter Profile on Rock Fragmentation Under Different Rock Type and Confining Pressure Conditions[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 332-339. doi: 10.3969/j.issn.0258-2724.20210171
Citation: ZHANG Mengqi, WANG Yibo, ZHANG Longguan, DUAN Wenjun, SU Yemao, MO Jiliang, ZHOU Zhongrong. Effects of TBM Cutter Profile on Rock Fragmentation Under Different Rock Type and Confining Pressure Conditions[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 332-339. doi: 10.3969/j.issn.0258-2724.20210171

不同岩石和围压下刃形对滚刀破岩性能的影响

doi: 10.3969/j.issn.0258-2724.20210171
基金项目: 国家自然科学基金(52005419);四川省科技重点研发项目(21ZDYF3658)
详细信息
    作者简介:

    张蒙祺(1989—),男,助理研究员,博士,研究方向为接触力学与摩擦学,E-mail:mzhang@swjtu.edu.cn

    通讯作者:

    莫继良(1982—),男,研究员,博士,研究方向为摩擦学与动力学,E-mail:jlmo@swjtu.cn

  • 中图分类号: TH122

Effects of TBM Cutter Profile on Rock Fragmentation Under Different Rock Type and Confining Pressure Conditions

  • 摘要:

    滚刀位于全断面隧道掘进机(TBM)最前端,与岩石直接发生接触,是执行破岩掘进的关键零部件. 研究TBM滚刀截面轮廓(刃形)对其破岩性能的影响机理和规律,对指导工程实际中滚刀选型与设计、提高TBM掘进效率具有重要意义. 首先建立二维颗粒流离散元模型,针对工程中最常用的平头滚刀和圆弧滚刀,选取两种强度不同的岩石并对其中一种施加固定10 MPa围压;然后,开展滚刀破岩仿真,通过分析比能、破岩体积、刀具载荷、裂纹数量等结果,对滚刀刃形与岩石破碎的关联性进行研究;最后,通过缩比滚刀破岩实验验证数值分析所得结论的正确性. 分析结果表明:滚刀刃形对其破岩性能影响显著,在本文所涉及参数范围内,对于多数岩石强度与围压组合,圆弧滚刀比能均低于平头滚刀比能,平均降低19.8%;圆弧滚刀破岩力比平顶滚刀破岩力平均低32.6%,表明破岩过程中圆弧滚刀做功较少,而二者产生的岩石碎片总体积相差不大(平均差值7%),则圆弧滚刀破除单位体积岩石所消耗的能量更少. 综上所述,两种常用滚刀刃形相比,在岩石强度与围压较高的地层中可考虑优先选用圆弧滚刀.

     

  • 图 1  颗粒间平行黏结示意

    Figure 1.  Schematic of particle connection

    图 2  滚刀破岩颗粒流模型及滚刀刃形

    Figure 2.  Schematics of the particle flow model for rock cutting and the cutter profiles

    图 3  不同刀间距下岩石内裂纹分布

    Figure 3.  Crack distributions under different cutter spaces

    图 4  不同刀间距下滚刀破岩仿真结果

    Figure 4.  Rock cutting results under different cutter space

    图 5  缩比滚刀破岩实验

    Figure 5.  Setup of the reduced-scale rock cutting experiment

    图 6  岩石试样典型破坏

    Figure 6.  Fragmentation of rock samples

    图 7  滚刀总法向力变化规律

    Figure 7.  Total normal force during rock cutting

    图 8  岩石碎片总体积的变化

    Figure 8.  Changes of the total volume of rock fragments

    表  1  岩石宏观力学属性

    Table  1.   Macroscopic mechanical properties of rocks

    岩石类型杨氏模量/
    GPa
    泊松比抗压强度/
    MPa
    抗拉强度/
    MPa
    玄武岩9.660.2128.406.60
    花岗岩41.30.24103.5914.73
    下载: 导出CSV

    表  2  颗粒流模型细观参数

    Table  2.   Microscopic parameters for the particle flow model

    参数类别参数名称玄武岩花岗岩
    模型通用参数颗粒直径下限/mm11
    颗粒直径上限/mm1.661.66
    颗粒密度/(kg·m−326502476
    阻尼系数0.70.7
    线性接触参数等效模量/GPa6.2825
    摩擦系数0.500.20
    刚度比1.451.25
    平行胶结参数初始间隙容差/×10−41.02.0
    半径系数1.001.00
    等效模量/GPa6.2825
    刚度比1.451.25
    力矩贡献系数1.001.00
    抗拉强度平均值/MPa16.533
    抗拉强度标准差/MPa4.1258.25
    内聚力平均值/MPa16165
    内聚力标准差/MPa441.25
    摩擦角/(°)30.0025.00
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-03-09
  • 修回日期:  2021-08-26
  • 网络出版日期:  2022-12-10
  • 刊出日期:  2022-07-01

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