SFRC管片正截面设计方法适用性比较研究  

Comparative Study on Applicability of Normal Section Design Method for Steel Fiber-Reinforced Concrete Segment

作　　者：肖明清[1,2] 封坤 杨仁杰[3] 谢俊 苟超[4] XIAO Mingqing;FENG Kun;YANG Renjie;XIE Jun;GOU Chao(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430071,Hubei,China;National&Local Joint Engineering Research Center of Underwater Tunnel Technology,Wuhan 430071,Hubei,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;CCCC First Highway Consultants Co.,Ltd.,Xi'an 710000,Shaanxi,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430071 [2]水下隧道技术国家地方联合工程研究中心,湖北武汉430071 [3]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [4]中交第一公路勘察设计研究院有限公司,陕西西安710000

出　　处：《隧道建设（中英文）》2021年第9期1530-1537,共8页Tunnel Construction

基　　金：国家自然科学基金项目(52078430,51878569)。

摘　　要：为解决在盾构隧道领域没有相对统一的钢纤维-钢筋混凝土管片结构设计方法的问题,选取目前世界上常用的3种钢纤维混凝土结构设计规范针对某一具体工况进行计算,将不同规范得到的正截面承载力及裂缝宽度进行对比。同时,设计钢纤维-钢筋混凝土管片力学性能试验,对上述计算工况进行试验。得到主要结论如下:1)ACI 544计算结果较为保守,低估了钢纤维的作用;而CECS 38:2004模型和Model Code 2010模型计算结果较合理。从管片的承载能力上考虑,CECS 38:2004模型和Model Code 2010模型可以用于指导管片结构设计。2)德国标准DIN1045-1和CECS 38:2004规范中对钢纤维-钢筋混凝土管片最大裂缝宽度的预测结果较为保守,不能较好反映管片结构的裂缝宽度。3)综合考虑钢纤维掺入对管片承载力的影响以及管片最大裂缝宽度的大小,推荐采用Model Code 2010中的方法进行盾构隧道管片结构设计。In China,no uniform design method is currently available for the usage of the steel fiber-reinforced concrete(SFRC)segment structure in shield tunneling.Accordingly,three kinds of SFRC structure design codes are selected and used herein to calculate a specific working condition.The normal section bearing capacity and the crack width obtained by these codes are compared.A mechanical property test of the SFRC segment is then designed and conducted.First,the calculation results obtained by ACI 544 are found to be conservative,consequently underestimating the effect of steel fibers,whereas those obtained by the CECS 38:2004 and Model Code 2010 models are much reasonable.From the perspective of the segment bearing capacity,the CECS 38:2004 and Model Code 2010 models can be used to guide the structural design of segments.Second,the maximum crack widths of the SFRC segment in the German standard DIN1045-1 and CECS 38:2004 are conservative and cannot reflect the crack width of the segment well.Third,considering the influence of steel fiber on the bearing capacity and maximum crack width of the segment,the segment structure design method in Model Code 2010 is recommended for shield tunneling.

关 键 词：盾构隧道 管片衬砌 钢纤维-钢筋混凝土 正截面设计 

分 类 号：U45[建筑科学—桥梁与隧道工程]