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基于压缩和油脂逃逸试验的盾尾刷密封性分析

钟小春 黄思远 竺维彬 陈乔松 游智

钟小春, 黄思远, 竺维彬, 陈乔松, 游智. 基于压缩和油脂逃逸试验的盾尾刷密封性分析[J]. 西南交通大学学报, 2023, 58(1): 125-132. doi: 10.3969/j.issn.0258-2724.20210814
引用本文: 钟小春, 黄思远, 竺维彬, 陈乔松, 游智. 基于压缩和油脂逃逸试验的盾尾刷密封性分析[J]. 西南交通大学学报, 2023, 58(1): 125-132. doi: 10.3969/j.issn.0258-2724.20210814
ZHONG Xiaochun, HUANG Siyuan, ZHU Weibin, CHEN Qiaosong, YOU Zhi. Analysis of Sealing Performance of Shield Tail Brush Based on Compression and Grease Escape Test[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 125-132. doi: 10.3969/j.issn.0258-2724.20210814
Citation: ZHONG Xiaochun, HUANG Siyuan, ZHU Weibin, CHEN Qiaosong, YOU Zhi. Analysis of Sealing Performance of Shield Tail Brush Based on Compression and Grease Escape Test[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 125-132. doi: 10.3969/j.issn.0258-2724.20210814

基于压缩和油脂逃逸试验的盾尾刷密封性分析

doi: 10.3969/j.issn.0258-2724.20210814
基金项目: 国家自然科学基金(52178387,51678217)
详细信息
    作者简介:

    钟小春(1976—),男,副教授,博士,研究方向为盾构隧道施工技术,E-mail: xchzhong@hhu.edu.cn

  • 中图分类号: U455.43

Analysis of Sealing Performance of Shield Tail Brush Based on Compression and Grease Escape Test

  • 摘要:

    为研究盾尾刷质量问题对盾尾刷密封系统工作性能的影响,基于动态压缩试验与油脂逃逸试验,探讨了盾尾刷长期挤压、磨损程度、砂浆渗入对盾尾刷密封性能的影响机理. 首先,通过动态压缩试验,获得各个影响因素下盾尾刷贴合力变化规律;其次,利用油脂逃逸试验获取不同工况下盾尾刷的油脂逃逸量;最后,以贴合力为媒介,将影响盾尾刷质量的因素与油脂逃逸量联系起来,探讨盾尾刷的密封性能. 研究结果表明:长期挤压、盾尾刷磨损程度、砂浆渗入等因素对盾尾刷弹性性能的影响显著,尤其是砂浆渗入,盾尾刷弹性性能损失最大可达90%;油脂压力存在一临界压力,盾尾间隙为50、70、90 mm的临界油脂压力分别为0.4、0.3、0.2 MPa,低于临界压力时油脂逃逸量极少,超过临界压力时油脂逃逸量陡增,油脂压力增加0.1 MPa,油脂逃逸量增加4倍以上;在盾构平均盾尾间隙(70 mm)条件下,当保护板磨损超过1/2与砂浆渗入比超过10%时,油脂逃逸将超过工程容许上限.

     

  • 图 1  盾尾刷构造及细部尺寸

    Figure 1.  Structure and detailed dimension of shield tail brush

    图 2  盾尾刷动态压缩试验

    Figure 2.  Dynamic compression test of shield tail brush

    图 3  油脂逃逸单元体试验

    Figure 3.  Test of grease escape unit

    图 4  动态压缩试验中盾尾刷弹性系数的变化

    Figure 4.  Variation of elastic coefficient of shield tail brush in dynamic compression test

    图 5  磨损程度对盾尾刷弹性性能影响

    Figure 5.  Influence of wear degree on elastic property of shield tail brush

    图 6  不同砂浆掺入比对盾尾刷弹性性能影响

    Figure 6.  Effect of different mortar penetration ratio on elastic property of shield tail brush

    图 7  盾尾刷油脂逃逸分区

    Figure 7.  Partition diagram of shield tail brush in grease escape test

    图 8  油脂逃逸量与贴合力拟合关系

    Figure 8.  Fitting relationship between grease escape rate and adhesion force

    图 9  盾尾刷保护板磨损对密封性影响

    Figure 9.  Influence of protection plate wear on sealing performance of shield tail brush

    图 10  盾尾刷砂浆渗入比对密封性影响

    Figure 10.  Influence of mortar penetration ratio on sealing performance of shield tail brush

    表  1  正常盾尾刷的贴合力与残余高度

    Table  1.   Adhesion force and residual height of normal shield tail brush

    压缩次数/次盾尾间隙 50 mm盾尾间隙 70 mm盾尾间隙 90 mm
    贴合力/N残余高度/mm贴合力/N残余高度/mm贴合力/N残余高度/mm
    1 1509.2 182.0 1303.4 186.0 588.0 183.0
    10 1479.8 151.0 1195.6 170.0 548.8 179.0
    50 1430.8 147.5 850.6 168.0 431.2 177.0
    100 1421.0 145.0 754.6 165.0 411.6 176.0
    200 1401.4 142.5 695.8 163.0 401.8 176.0
    300 1391.6 140.0 637.0 162.5 401.8 175.0
    400 1391.6 138.0 597.8 162.0 392.0 175.0
    600 1372.0 136.0 558.6 160.5 392.0 174.0
    800 1362.2 135.0 558.6 159.5 392.0 174.0
    下载: 导出CSV

    表  2  磨损盾尾刷的贴合力与残余高度

    Table  2.   Adhesion force and residual height of worn shield tail brush

    保护板磨损程度盾尾间隙 50 mm盾尾间隙 70 mm盾尾间隙 90 mm
    贴合力/N残余高度/mm贴合力/N残余高度/mm贴合力/N残余高度/mm
    未磨损1392.4136.0597.8157.0382.2174.0
    磨损 1/41185.0125.0475.2142.0294.0174.0
    磨损 1/21114.7121.0431.2140.0117.6189.0
    磨损 2/3 686.0119.0196.0138.00190.0
    下载: 导出CSV

    表  3  不同工况下的盾尾刷贴合力

    Table  3.   Adhesion force of shield tail brush under different working conditions N

    盾尾间隙/mm砂浆渗入比/%
    0104080
    501391.61164.8490.0333.2
    601136.8891.8490.0333.2
    70602.3460.0392.2294.2
    80502.1176.4303.8254.8
    90391.288.2245.0225.4
    100245.085.4196.0219.3
    下载: 导出CSV

    表  4  盾尾刷密封性统计

    Table  4.   Sealing performance statistics of shield tail brush

    盾尾刷弹性影响因素油脂逃逸量/(L•环−1
    磨损程度 保护板磨损 1/4 75~110
    保护板磨损 1/2 80~125
    保护板磨损 2/3 120~200
    渗入比 砂浆渗入 10% 80~125
    砂浆渗入 40% 90~130
    砂浆渗入 80% 105~150
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-03
  • 修回日期:  2022-03-24
  • 网络出版日期:  2022-10-29
  • 刊出日期:  2022-03-31

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