摘要
受限于监测技术和施工期荷载复杂性,盾构隧道管片衬砌施工期外荷载还未有全面系统的分析,现行的盾构隧道设计规范无明确计算方法。为了解决上述问题,采用自主研发的无线传输系统实现了对盾构隧道管片衬砌全过程外荷载的实时、高频自动化监测,并根据盾构隧道施工特点将管片外荷载划分为盾尾阶段、注浆阶段和趋于稳定阶段,通过分析各阶段荷载与油脂注入压力、浆液注入压力等施工参数之间的相关性,分别建立了油脂荷载与油脂注入压力、盾尾刷荷载与油脂荷载、浆液荷载与浆液充填率之间的定量关系,并将稳定后监测荷载与全土柱法计算结果进行了对比验证。研究结果表明:管片衬砌在盾尾阶段受到的外荷载最大,在管片设计时应着重考虑该阶段荷载;由于盾构机油脂注入采用压力控制模式,油脂荷载由油脂注入压力所决定,且油脂荷载为油脂注入压力的0.18~0.26倍;尾刷荷载与油脂荷载环向分布极为相似,盾尾阶段管片荷载以油脂荷载为主;浆液荷载总体上呈顶部小底部大的“梨形”分布,环向分布可采用浆液注入量相关的环向荷载均值和浆液重力梯度进行描述,其大小相比试验实测结果最大误差分别为13%、19%,该计算方法可有效计算浆液荷载。上述研究结果可为盾构隧道管片设计提供参考。
Due to limitations in monitoring technology and the complexity of loads during the construction phase,there has been no comprehensive and systematic analysis of external loads on shield tunnel segment linings during construction.Furthermore,current shield tunnel design codes lack a clear calculation method for such loads.To address these issues,this study utilized a self-developed wireless transmission system to achieve realtime,high-frequency,automatic monitoring of external loads throughout the construction process.The external load on the segment lining was divided into three phases,which were the shield tail phase,the grouting phase,and the stabilization phase,based on the construction characteristics of shield tunnels.The quantitative relationship between the grouting load and the grout filling rate was established,and post-stabilization monitoring data were compared with the calculated results from the full soil column method.The findings are drawn as follows.The external load on the segment lining is greatest during the shield tail phase,highlighting the importance of considering this load in segment design.As the grease injection in the shield machine is controlled by pressure,the grease load is directly proportional to the injection pressure,ranging from 0.18 to 0.26 times the grease injection pressure.The circumferential distributions of the tail brush load and grease load are found to be very similar,with the grease load dominating the segment load during the tail phase.The grouting load typically follows a“pear-shaped”distribution,small at the top and larger at the bottom,and its circumferential distribution can be described by the mean value of the hoop load,which is related to the grout injection volume and the grout’s gravity gradient.The maximum error of the calculated grouting load is 13%and 19%,respectively,compared to the measured test results,demonstrating the method’s effectiveness in calculating grouting loads.These findings can provide a valuable reference for shield tunnel segment design.
作者
秦楠
单晓波
武文清
姚印彬
柳献
QIN Nan;SHAN Xiaobo;WU Wenqing;YAO Yinbin;LIU Xian(College of Civil Engineering,Tongji University,Shanghai 200092,China;China Railway 14th Bureau Group Shield Tunnel Engineering Co.,Ltd.,Nanjing 211800,China)
出处
《铁道科学与工程学报》
北大核心
2025年第5期2229-2241,共13页
Journal of Railway Science and Engineering
基金
中铁十四局集团有限公司科研课题(202214jtky0070)。
关键词
盾构隧道
荷载分布
特征分析
油脂荷载
尾刷荷载
shield tunnel
load distribution
characteristic analysis
grease load
tail brush load
