1. 上海隧道工程有限公司, 上海 200233； 2. 同济大学 地下建筑与工程系, 上海 200092
出版日期:2019-10-28发布日期:2019-11-01通讯作者:朱叶艇（1987-），男，浙江省绍兴市人，博士后，现主要从事软土盾构隧道及地下建筑工程相关方面研究工作.E-mail：1210278theronzhu@tongji.edu.cn.基金资助:上海市国资委企业技术创新和能级提升项目（2013017）Prediction and Visualization of Crack Width for the Prototype Test on Special-Shaped Shield Segments
ZHU Yeting 1,2,ZHU Yanfei 1,ZHANG Zixin 2,ZHUANG Qianwei 1,ZHENG Yifeng 11. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200233, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Online:2019-10-28Published:2019-11-01摘要/Abstract
摘要： 预测和可视化监测异形盾构管片混凝土裂缝宽度和开展规律对站立式原型异形盾构管片加载系统的研发以及后续的异形盾构管片优化设计至关重要.通过梁荷载试验完善了体积率为2%的CF50钢锭铣削型钢纤维混凝土最大裂缝宽度理论公式，同时创新性地在原型管片结构试验领域引入非接触式应变光学测量系统，对管片拱顶内弧面关键区域进行裂缝实时监测.研究结果表明，基于三维数字图像技术(DIC-3D)可定义管片裂缝出现时机判定和裂缝宽度计算方法.管片裂缝宽度经历了初始、稳定和加速等三阶段发展过程，最终确定出异形盾构衬砌结构极限覆土深度为18.5m.梁荷载试验所获最大裂缝宽度理论公式中的相关设计参数是有效的，未来可结合壳-弹簧模型计算管片内力结果进行异形盾构管片裂缝宽度的科学预测.
关键词: 异形盾构； 原型试验； 破坏； 混凝土裂缝； 数字图像技术
Abstract: Prediction and visualization of the width and developing law of the key cracks are crucial to the invention of the standing prototype loading system and the further optimal design for special-shaped segmental structure. This paper conducted loading tests on a CF50 steel fiber reinforced concrete beam with a volume rate of 2% to improve the theoretical formula of the maximum crack width, and the non-contacting strain optical measuring technique was adopted for the first time in the field of prototype loading tests on segmental lining to monitor the cracking characteristics in key areas of the inner surface of the tunnel vault. The study shows that the determination method of crack initiation time and calculation method of crack width can be based on three-dimensional digital image processing technology (DIC-3D). The increment of the crack width experiences initial, stable and accelerated three stages, and the ultimate buried depth of special-shaped tunnel is finally determined to be 18.5m. The calculation parameters obtained from the beam loading tests for the theoretical maximum crack width are verified to be effective, and prediction of the crack width combined with the internal forces derived from shell-spring model is suggested.
Key words: special-shaped shield; prototype test; damage; concrete crack; digital image processing technology
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