设计、施工、监测

风化岩层盾尾同步双液浆控制管片上浮研究

  • 胡如成 ,
  • 钟小春 ,
  • 易斌斌 ,
  • 刘哲 ,
  • 刘程
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  • 1.中铁五局集团有限公司,长沙 410117;
    2.河海大学 土木与交通学院,南京 210098;
    3.广州地铁集团有限公司建设事业总部,广州 510330
胡如成(1979—),男,湖南耒阳人,硕士,高级工程师,主要从事城市轨道交通工程的研究工作。E-mail:552467528@qq.com

收稿日期: 2024-02-16

  网络出版日期: 2025-01-03

基金资助

国家自然科学基金(52178387, 51678217)

Study on Floating of Shield Tail Segment Controlled by Synchronous Two-Component Grout in Weathered Rock Strata

  • Hu Rucheng ,
  • Zhong Xiaochun ,
  • Yi Binbin ,
  • Liu Zhe ,
  • Liu Cheng
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  • 1. China Railway No. 5 Engineering Bureau Group Co., Ltd., Changsha 410117, P. R. China;
    2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, P. R. China;
    3. Construction Business Headquarters, Guangzhou Metro Group Co., Ltd., Guangzhou 510330, P. R. China

Received date: 2024-02-16

  Online published: 2025-01-03

摘要

针对盾构在全断面风化岩层中掘进易发生管片上浮量过大的问题,首先通过倒杯法测试了在不同添加剂(促强干粉(A料)、液体激发剂(B料))掺量下浆液的初凝时间,配制了初凝时间可控且泵送性满足要求的同步双液浆。其次建立管片上浮有限元模型,考虑了环间接头轴向受拉和环向剪切刚度的非线性,应用该模型可以考虑盾构掘进过程中上浮位移逐步累加效应,得到了同步双液浆对稳定围岩地层中盾尾管片上浮的影响规律。最后将开发的同步双液浆应用于广州某盾构综合管廊工程,较好地控制了管片上浮,大幅度减少了拼装管片接缝的渗漏,管片拼装质量整体优良。研究结果表明:(1)采用1%的A料、1.5%的B料在盾尾注浆管与单液砂浆混合均匀后注入盾尾空隙,能有效地减少管片上浮量高达79%;(2)上浮量随着离盾尾距离增加而逐渐增大后趋于稳定,稳定处距离盾尾约10.5 m(7环),最大上浮位移约23 mm;(3)使用该新型同步双液浆后可有效地减少拼装管片的渗漏点数,减少量高达59%,大幅度减少了因渗漏而增加的封堵注浆施工成本,具有较好的经济效益。

本文引用格式

胡如成 , 钟小春 , 易斌斌 , 刘哲 , 刘程 . 风化岩层盾尾同步双液浆控制管片上浮研究[J]. 地下空间与工程学报, 2024 , 20(6) : 2010 -2019 . DOI: 10.20174/j.JUSE.2024.06.27

Abstract

Aiming at the problem of excessive floating of segments when shield tunneling in full section weathered surrounding rock strata firstly, the initial setting time of the slurry was tested by the inverted cup method under different additive dosage (strengthening dry powder (Material A), liquid activator (Material B)), and the synchronous two-component grout with controllable initial setting time and satisfactory pumping performance was prepared. Secondly, the finite element model of segment floating was established, considering the nonlinearity of axial tension and circumferential shear stiffness of the ring joints. The model can be used to consider the gradual accumulation effect of floating displacement during shield tunneling, and the influence of synchronous two-component grout on the floating of shield tail segment in stable surrounding rock stratum was obtained. Finally, the developed synchronous two-component grout was applied to a shield tunnel project in Guangzhou, and the effect of controlling segment floating is verified, which greatly reduces the leakage of segment joint with excellent segment assembly quality. The results show that: (1) 1% Material A and 1.5% Material B are mixed evenly with the single grout mortar in the shield tail grouting pipe and injected into the shield tail gap, which can effectively reduce the floating displacement of the segment up to 79%. (2) The floating displacement gradually increases with the increase of the distance from the shield tail and tends to be stable. The stable position is about 10.5 m (7 rings) from the shield tail. The maximum floating displacement is about 23 mm. (3) The use of the new synchronous two-component grout also effectively reduces the number of leakage points of the segments. The reduction is up to 59%, which greatly reduces the construction cost of plugging grouting due to leakage and has good economic benefits.

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