自密实高抗裂混凝土在盾构隧道工作井侧墙中的应用  

Application of self compacting and high anti-crack resistance concrete in working shaft sidewall of shield tunnel

作　　者：李明[1,2] 李敏 王晓琼[3,4] 王育江 LI Ming;LI Min;WANG Xiaoqiong;WANG Yujiang(State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China;Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China;China Railway 14th Bureau group Co.,Ltd.,Jinan 250101,China;China Railway 14th Bureau Group Mega Shield Construction Engineering Co.,Ltd.,Nanjing 211800,China;College of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,江苏南京210008 [2]江苏苏博特新材料股份有限公司,江苏南京211103 [3]中铁十四局集团有限公司,山东济南250101 [4]中铁十四局集团大盾构工程有限公司,江苏南京211800 [5]东南大学材料科学与工程学院,江苏南京211189

出　　处：《混凝土》2024年第9期171-175,180,共6页Concrete

基　　金：国家自然科学基金青年科学基金(52008192);江阴靖江长江隧道施工阶段专题“现浇隧道混凝土抗裂性及外观质量提升技术研究”。

摘　　要：采用明挖顺作法施工的盾构隧道工作井侧墙位于由维护结构、环框梁、底板及模板组成的密封空间内,其受到的约束作用强,施工难度大,容易因混凝土收缩开裂及浇筑不密实导致渗漏。依托在建的江阴靖江长江隧道工程,在室内研究的基础上,通过现场系列模型试验,比较了采用不同混凝土材料及施工工艺时混凝土结构的密实性。模型试验及工程应用结果表明,采用自密实高抗裂混凝土,结合布料工艺、浇筑速率、分层浇筑静置时间的控制,并辅以必要的振捣,可保证混凝土浇筑密实,进一步结合抗裂温控措施,可消除混凝土收缩裂缝,避免工作井侧墙出现渗漏。The working shaft sidewall of shield tunnel constructed by cut and cover method is located in a sealed space composed of maintenance structure,ring beam,bottom floor and formwork.which is subject to a strongly constraint and difficult to construct,thus the leakage can be always observed due to the shrinkage cracking and non-compact pouring of concrete.Based on the Jiangyin Jingjiang Yangtze River Tunnel,the compactness of concrete structure with different concrete materials and construction techniques were compared through laboratory test and a series of field model tests.The results of model test and engineering application showed that the use of self-compacting and high-crack resistant concrete,combined with the control of distribution process,pouring rate,layered pouring standing time,and supplemented by necessary vibration,can ensure the compaction of concrete,and further combined with anti-crack temperature control measures,can eliminate concrete shrinkage cracks,then avoid leakage of the working well sidewall.

关 键 词：自密实混凝土 裂缝控制 盾构隧道 工作井侧墙 渗漏 

分 类 号：TU528.53[建筑科学—建筑技术科学]