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盾构管片上浮量理论计算模型及上浮控制措施研究

杨志勇 杨星 张长旺 孙正阳 江玉生 邵小康

杨志勇, 杨星, 张长旺, 孙正阳, 江玉生, 邵小康. 盾构管片上浮量理论计算模型及上浮控制措施研究[J]. 矿业科学学报, 2021, 6(5): 591-597, 605. doi: 10.19606/j.cnki.jmst.2021.05.008
引用本文: 杨志勇, 杨星, 张长旺, 孙正阳, 江玉生, 邵小康. 盾构管片上浮量理论计算模型及上浮控制措施研究[J]. 矿业科学学报, 2021, 6(5): 591-597, 605. doi: 10.19606/j.cnki.jmst.2021.05.008
Yang Zhiyong, Yang Xing, Zhang Changwang, Sun Zhengyang, Jiang Yusheng, Shao Xiaokang. Research on theoretical calculation model of shield segments floating amount and floating control measures[J]. Journal of Mining Science and Technology, 2021, 6(5): 591-597, 605. doi: 10.19606/j.cnki.jmst.2021.05.008
Citation: Yang Zhiyong, Yang Xing, Zhang Changwang, Sun Zhengyang, Jiang Yusheng, Shao Xiaokang. Research on theoretical calculation model of shield segments floating amount and floating control measures[J]. Journal of Mining Science and Technology, 2021, 6(5): 591-597, 605. doi: 10.19606/j.cnki.jmst.2021.05.008

盾构管片上浮量理论计算模型及上浮控制措施研究

doi: 10.19606/j.cnki.jmst.2021.05.008
基金项目: 

国家自然科学基金煤炭联合基金 U1261212

详细信息
    作者简介:

    杨志勇(1980—),男,湖北松滋人,博士,讲师,主要从事盾构/TBM隧道技术的教学与研究工作。Tel:18610719295,E-mail:yangzy1010@126.com

  • 中图分类号: TU41

Research on theoretical calculation model of shield segments floating amount and floating control measures

  • 摘要: 盾构管片上浮会导致管片错台、破损,降低隧道的整体结构强度、防水性能及使用寿命。在建立管片受力模型的基础上,通过分析管片的受力状态建立了管片上浮的理论计算模型。以北京地铁新机场线3号风井至草桥站盾构区间为背景,对该区间管片异常上浮的原因进行了分析,通过改良同步注浆浆液性能有效地控制了管片的上浮量,并对改进前后的浆液特性进行了试验,最后基于浆液试验结果和理论计算模型对管片上浮量进行了计算。研究结果表明:管片上浮量的理论计算结果与实测值较为吻合,本文的理论计算模型具有较好的准确性; 管片在脱出盾尾后的短时间内会大量上浮,缩短浆液初凝时间、提高其早期强度是控制管片上浮的有效措施。
  • 图  1  管片受力示意图

    Figure  1.  Schematic diagram of segment force

    图  2  同步注浆压力分布及管路布置情况

    Figure  2.  Synchronous grouting pressure distribution and pipeline layout

    图  3  黏滞阻力计算示意图

    Figure  3.  Schematic diagram of viscous resistance calculation

    图  4  地质剖面图

    Figure  4.  Geologic profile

    图  5  280~490环管片上浮量的实测值与计算值

    Figure  5.  Measured value and calculated value of the floating amount of the segment between 280 and 490 rings

    图  6  开挖地层情况

    Figure  6.  Excavated ground conditions

    图  7  浆液改进前后管片上浮量-时间关系

    Figure  7.  Floating amount of segment before and after slurry improvement-time relationship

    图  8  浆液配比及力学特性试验

    Figure  8.  Slurry ratio and mechanical characteristics test

    表  1  管片上浮量计算参数

    Table  1.   Calculation parameters of the floating amount of the segment

    参数 数值 参数 数值
    b 1.6 m μt 1.16×103 kPa·s
    R0 4.4 m n 16
    γj 12 kN/m3 Ni 100 kN
    γc 25 kN/m3 k1 1.56×103 kPa·s
    R1 3.95 m k2 0.015
    Nj 5 000 kN lb 0.4 m
    rb 0.015 m [τ] 175 MPa
    δ1 0.175 m μ 0.31
    A 14.608 m2 E0 140 MPa
    δ2 0.05 m q1 160 kPa
    β 1.63° q2 250 kPa
    T 2.5×104 kN
    下载: 导出CSV

    表  2  同步注浆浆液配比参数

    Table  2.   Synchronous grouting slurry ratio

    浆液 水泥/kg 粉煤灰/kg 膨润土/kg 砂/kg 水/kg
    改进前 120 400 130 800 700
    改进后 160 400 150 550 640
    下载: 导出CSV

    表  3  同步注浆浆液强度及时变性参数

    Table  3.   Synchronous grouting slurry characteristics and time varying parameters

    浆液 初凝时间/h 抗压强度/kPa k1/(MPa·s) k2
    1d 2d 7d
    改进前 4.5 59 267.96 519.8 1.56 0.015
    改进后 3 217 695.3 3 154.5 2.05 0.02
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-01
  • 修回日期:  2021-05-25
  • 刊出日期:  2021-10-01

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