基于盾构管片上浮控制的同步浆液初凝时间研究  

Study on the Initial Setting Time of Simultaneous Slurry Based on Shield Tunnel Segment Floatation Control

作　　者：周勋 杨金秋 韦生达 曹江涛 马龙祥[3] Zhou Xun;Yang Jinqiu;Wei Shengda;Cao Jiangtao;Ma Longxiang(CCCC Road and Bridge Construction Co.,Ltd.,Beijing 100027,P.R.China;Chengdu Railway Construction Management Co.,Ltd.,Chengdu 610041,P.R.China;MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,P.R.China)

机构地区：[1]中交路桥建设有限公司,北京100027 [2]成都轨道建设管理有限公司,成都610041 [3]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《地下空间与工程学报》2024年第6期1991-1999,共9页Chinese Journal of Underground Space and Engineering

基　　金：中交路桥建设有限公司科技项目(R110122H01185)。

摘　　要：目前少有同步浆液初凝时间对盾构施工期管片上浮影响的定量研究,导致较难为各种施工情况提供合理的浆液初凝时间建议。鉴于此,笔者建立了考虑隧道埋深影响的盾构隧道施工上浮纵向解析模型,并基于同步浆液初凝时间与盾构管片纵向受浮力作用区段长度之间的关系,系统研究了中风化泥岩地层中盾构隧道施工期同步浆液合理初凝时间的选择问题,结果表明:浆液初凝时间对盾构隧道施工期的最终累积纵向性态指标有重要影响,表现为浆液初凝时间越长,上浮荷载引起的管片累积上浮量值、纵向弯矩及纵向剪力均越大,且随着浆液初凝时间的等间距增长,相应性态指标的增大量值会有一定幅度的增大;从盾构隧道施工上浮控制的角度看,同步浆液初凝时间与盾构平均掘进速度应具备一定的匹配关系,盾构平均掘进速度越快,合理的浆液初凝时间也应越短;通过配合比设计,将同步浆液初凝时间调整为约5 h后,依托工程施工上浮问题得到了明显改善。Currently,there is a little research on the impact of simultaneous slurry initial setting time on the buoyancy of tunnel lining during shield tunneling construction.This makes it difficult to provide reasonable recommendations for slurry initial setting time under various construction conditions.Therefore,a quantitative longitudinal analytical model considering the influence of tunnel depth on shield tunnel construction buoyancy has been established.Based on the relationship between simultaneous slurry initial setting time and the length of the section where the shield tunnel lining is affected by buoyancy,the proper selection of initial setting time for simultaneous slurry during the construction period in moderately weathered clayey formations was systematically studied.The results show that the initial setting time of the slurry has a significant impact on the final cumulative longitudinal behavior of the shield tunnel during the construction period.A longer initial setting time leads to greater cumulative uplift load,longitudinal bending moment,and longitudinal shear caused by buoyancy.Moreover,with an equidistant increase in the initial setting time,the magnitudes of these behavior indicators also increase to a certain extent.From the perspective of controlling buoyancy in shield tunnel construction,there should be a matching relationship between the simultaneous slurry initial setting time and the average excavation speed of the shield.Specifically,as the average excavation speed increases,the reasonable initial setting time should be shorter.By adjusting the simultaneous slurry initial setting time to approximately 5 hours through mix design,a significant improvement in the buoyancy problem during construction has been achieved.

关 键 词：盾构隧道 施工上浮 同步注浆 浆液初凝时间 

分 类 号：TU92[建筑科学—建筑设计及理论]