湖底隧道侧墙抗裂混凝土刚性自防水技术研究与应用  

Research and Application of Rigid Self-Waterproofing Technology of Crack Resistant Concrete for Side Wall of Lake Tunnel

作　　者：刘时光 LIU Shiguang(China Railway 14th Bureau Group Second Engineering Co.Ltd.,Tai’an Shandong 271000,China)

机构地区：[1]中铁十四局集团第二工程有限公司,山东泰安271000

出　　处：《铁道建筑技术》2023年第8期160-164,共5页Railway Construction Technology

基　　金：中铁十四局集团有限公司科技开发计划项目(201907)。

摘　　要：为确保金鸡湖隧道结构自防水性能,预防收缩开裂风险,结合温度、应变监测数据,在采用温控膨胀抗裂剂优化混凝土配合比基础上,基于多场耦合机制混凝土开裂风险评估方法对混凝土入模温度、分段浇筑长度、侧墙厚度、模板选型、设置冷却水管等影响因素进行评估,并提出温度指标、混凝土搅拌浇筑等针对性工艺方案。采用抗裂混凝土及冷却管协同作用可避免厚度大于1.2 m的侧墙开裂风险,经施工验证,混凝土控温措施得当并配合规范施工可消除侧墙结构缺陷裂缝,提高自防水性能。In order to ensure the self-waterproofing performance of Jinji Lake tunnel structure and prevent the risk of shrinkage cracking,combined with the monitoring data of temperature and strain,on the basis of optimizing the concrete mix with temperature-controlled expansion anti-cracking agent,the concrete cracking risk assessment method based on the multi-field coupling mechanism was used to evaluate the influencing factors such as the concrete casting temperature,section pouring length,side wall thickness,template selection,setting of cooling water pipes,and the temperature index,concrete mixing pouring and other specific technological schemes were put forward.The joint action of anti-cracking concrete and cooling pipe was used to limit the cracking risk of side walls with thickness greater than 1.2 m.After construction inspection,proper concrete temperature control measures and standard construction can eliminate the defects and cracks of the side walls of the structure and improve the self-waterproofing performance.

关 键 词：自防水 温控膨胀抗裂剂 耦合机制 开裂风险 缺陷裂缝 

分 类 号：TU528.32[建筑科学—建筑技术科学] U454[建筑科学—桥梁与隧道工程]