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隧道建设(中英文)

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大直径盾构盾尾管片上浮影响的现场试验研究

贺小宾1,2,马 帅3,陈 健2,4,李明宇3,4,*,余刘成3,4,郝军1,2   

  1. (1. 中铁十四局集团大盾构工程有限公司, 江苏 南京 211800;2. 中铁十四局集团有限公司,山东 济南
    250101;3. 郑州大学土木工程学院,河南 郑州 450001;4. 中国铁建水下隧道工程实验室,山东 济南 250101)
  • 发布日期:2023-11-09

Field Test Research on the Influence of Construction on the Segment Floating of Large-Diameter Shield Tunnel#br#

HE Xiaobin1,2,MA Shuai3,CHEN Jian2,4,LI Mingyu3,4,*,YU Liucheng3,4,HAO Jun1,2   

  1. (1. China Railway 14th Bureau Group Shield Engineering Co., Ltd., Nanjing 211800, Jiangsu, China; 2. China Railway
    14th Bureau Group Co., Ltd., Jinan 250101, Shandong, China; 3. School of Civil Engineering, Zhengzhou University,
    Zhengzhou 450001, Henan, China; 4. China Railway Construction Underwater Tunnel Engineering Laboratory, Jinan
    250101, Shandong, China)
  • Published:2023-11-09

摘要: 为探究高水压粉质黏土地层中大直径盾构管片上浮规律及其与施工参数的相关性,通过室内浆液配比试验与浆液性能测试,
结合济南黄河隧道工程现场试验,研究不同配比浆液与关键施工参数对管片上浮的影响。研究结果表明:1)水泥、粉煤灰、减水
剂掺量增加能导致浆液凝结时间缩短,有利于减小管片上浮,泌水率、流动度和稠度下降,对管片上浮控制不利;2)大直径盾构
隧道管片上浮规律近似成抛物线,管片在开始同步注浆的10 h 内快速上浮,随后迅速减缓,在25 ~ 30 h 后趋于稳定;3)由于
管片上浮受多种因素耦合影响,因此仅调整浆液配比不一定能有效控制管片上浮量,建议同步减小出进浆量差和刀盘接触压力,
保持刀盘扭矩,减小上下断面千斤顶推力压力差和同步注浆压力差,并适当延长临时停机时间、掘进和管片拼装时间,降低掘进
速度。

关键词: 隧道工程, 大直径, 盾构隧道, 管片上浮, 同步注浆, 现场试验

Abstract: In order to explore the floating law of large diameter shield segments in high water pressure silty clay stratum and its correlation with construction parameters, the effects of different grout proportions and key construction parameters on the floating of segments were studied through the laboratory grout ratio test and grout performance test, combined with the field test of Jinan Yellow River Tunnel project. The results show that increasing the dosage of cement, fly ash and water-reducing agent can shorten the setting time of the grout, which is conducive to the decrease of segment floating, and the
decrease of bleeding rate, fluidity and consistency, which is unfavorable to the control of segment
floating. The floating law of large diameter shield tunnel segments is approximately parabolic, and it
quickly rises within 10 hours after the start of grouting, then slows down rapidly, and becomes stable
after 25 h ~ 30 h. Due to the joint influence of the various factors, adjusting only the proportion of grout
may not be able to control the floating of the segment. It is recommended to simultaneously reduce the
difference between the volume of mud discharged and mud entering and the cutter head contact pressure,
maintain the cutter head torque, reduce the difference of the thrust pressure of the upper and lower
section jack and the difference of the synchronous grouting pressure, additionally, appropriately extend
the temporary downtime, driving and assembling time of the segment, and reduced tunneling speed to
further control of segment float.

Key words: tunnel engineering, large diameter, shield tunnel, segment floating, synchronous grouting, field test