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

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

张蒙祺^1,,
王一博¹,
章龙管^{1, 2},
段文军^{1, 2},
苏叶茂^{1, 2},
莫继良^1, ,,
周仲荣¹

1.
西南交通大学机械工程学院，四川成都 610031
2.
中铁工程服务有限公司，四川成都 610083

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
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- 被引次数: 0
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

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

ZHANG Mengqi^1
,,
WANG Yibo¹,
ZHANG Longguan^{1, 2},
DUAN Wenjun^{1, 2},
SU Yemao^{1, 2},
MO Jiliang^{1
, ,},
ZHOU Zhongrong¹

1.
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
China Railway Engineering Services Co., Ltd., Chengdu 610083, China

摘要

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.
- 全断面隧道掘进机 /
- 滚刀刃形 /
- 比能 /
- 颗粒流离散元法 /
- 缩比滚刀破岩实验
Abstract:
The disc cutters located at the front end of a full-section tunnel boring machine (TBM) play an important role in the rock breaking process. The influence of the cross-sectional profile of the disc cutter on the rock fragmentation is important to study, to improve the TBM tunneling efficiency in engineering practice. Here, a two-dimensional particle flow model for rock cutting is established. Aiming at the flat-tip and circular-tip cutters, which are commonly used in engineering, two kinds of rocks with different strengths are selected, and a fixed confining pressure of 10 MPa is applied to one of the rocks. Then the rock cutting simulation is carried out, and the correlation between the cutter profile shape and the rock fragmentation is studied by analyzing the results of specific energies, rock fragment volumes, cutting forces, and crack numbers. A reduced-scale rock cutting experiment is performed to verify the correctness of the conclusions obtained from the simulations. The simulation results show that the cutter profile has a significant influence on the rock cutting performance. The specific energy of the circular-tip cutter is lower than that of the flat-tip cutter under most rock strengths and confining pressure conditions. The average reduction in the specific energy is 19.8% because the cutting force of the circular-tip cutter is 32.6% lower than that of the flat-top cutter on average. This indicates that the circular-top cutter does less work when tunneling, even though the total volumes of rock fragments created by the two types of cutters are similar (the average difference is 7%). Therefore, the circular-top cutter consumes less energy to break the same volume of rock. In summary, of the two commonly used cutter profiles, the circular-tip cutter is preferred for hard rock and high confining pressure tunneling.
- tunnel boring machine /
- cutter profile /
- specific energy /
- particle flow discrete element method /
- reduced-scale rock cutting experiment

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图 1 颗粒间平行黏结示意

Figure 1. Schematic of particle connection

下载: 全尺寸图片幻灯片

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

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图 3 不同刀间距下岩石内裂纹分布

Figure 3. Crack distributions under different cutter spaces

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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

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图 5 缩比滚刀破岩实验

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

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图 6 岩石试样典型破坏

Figure 6. Fragmentation of rock samples

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图 7 滚刀总法向力变化规律

Figure 7. Total normal force during rock cutting

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图 8 岩石碎片总体积的变化

Figure 8. Changes of the total volume of rock fragments

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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	9.66	0.21	28.40	6.60
花岗岩	41.3	0.24	103.59	14.73

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/mm	1	1
	颗粒直径上限/mm	1.66	1.66
	颗粒密度/（kg·m⁻³）	2650	2476
	阻尼系数	0.7	0.7
线性接触参数	等效模量/GPa	6.28	25
	摩擦系数	0.50	0.20
	刚度比	1.45	1.25
平行胶结参数	初始间隙容差/×10⁻⁴	1.0	2.0
	半径系数	1.00	1.00
	等效模量/GPa	6.28	25
	刚度比	1.45	1.25
	力矩贡献系数	1.00	1.00
	抗拉强度平均值/MPa	16.5	33
	抗拉强度标准差/MPa	4.125	8.25
	内聚力平均值/MPa	16	165
	内聚力标准差/MPa	4	41.25
	摩擦角/（°）	30.00	25.00

下载: 导出CSV

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