大直径盾构盾尾管片上浮影响的现场试验研究

贺小宾, 马帅, 陈健, 李明宇, 余刘成, 郝军

doi:10.3973/j.issn.2096-4498.2023.S2.015

隧道建设 >

2023 , Vol. 43 >Issue S2: 136 - 143

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.S2.015

研究与探索

大直径盾构盾尾管片上浮影响的现场试验研究

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(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)

贺小宾（1976—），男，山西沁源人，2010年毕业于石家庄铁道学院，土木工程专业，本科，高级工程师，从事隧道工程施工技术研究工作。E-mail: 47617751@qq.com。*通信作者：李明宇， E-mail: zzudixia@163.com。

网络出版日期: 2024-03-27

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Field Test on Construction Influence on LargeDiameter Shield Tail Segment Floating of Tunnel

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(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)

Online published: 2024-03-27

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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，保持刀盘转矩，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

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贺小宾, 马帅, 陈健, 李明宇, 余刘成, 郝军 . 大直径盾构盾尾管片上浮影响的现场试验研究[J]. 隧道建设, 2023 , 43(S2) : 136 -143 . DOI: 10.3973/j.issn.2096-4498.2023.S2.015

Abstract

To explore the floating patterns of largediameter shield tail segments in high water pressure silty clay strata and its correlation with construction parameters, an indoor grout mixing proportion and property test and a field test in Yellow rivercrossing tunnel in Jinan, China are conducted. The results reveal the following: (1) Increasing the dosage of cement, fly ash, and waterreducing agent shortens the setting time of the grout, which is conducive to the decrease of segment floating. A decrease in the bleeding rate, fluidity, and consistency is unfavorable to segment floating control. (2) The floating of largediameter shield tail segments presents a parabolic. It quickly rises within 10 hours after synchronous grouting, then slows down rapidly, and becomes stable after 25－30 h. (3) The floating of segments are affected by various factors, it is recommended to dynamically adjust the grout mixing proportions, control the difference between of slurry discharged and entering volumes, reduce the cutterhead contact pressure, maintain the cutterhead torque, reduce the difference of thrust pressure between upper and lower section jack and synchronous grouting pressure difference, as well as appropriately extend the temporary downtime, driving and assembling time of the segment, and reduce tunneling speed.

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

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