大直径盾构隧道分布式凹凸榫受力特性  

Mechanical Characteristics of Distributed Mortise-and-Tenon of Largediameter Shield Tunnels

作　　者：赵森森 张冬梅[1] 黄忠凯 ZHAO Sensen;ZHANG Dongmei;HUANG Zhongkai(School of Civil Engineering,Tongji University,Shanghai 200092)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《现代隧道技术》2022年第5期54-62,79,共10页Modern Tunnelling Technology

基　　金：佛山市交通科技有限公司城市公路盾构隧道结构安全与风险管控技术研究项目(JG2021(SZ)XZ0038);国家自然科学基金(52108381);中国博士后科学基金(2022T150484,2021M702491).

摘　　要：为探究大直径盾构隧道管片错台过程中分布式凹凸榫的抗剪作用及剪切破坏机理,依托佛山市季华路西延线顺德水道隧道工程,建立数值模型,分析凹凸榫在不同剪切方向、不同尺寸下的受力特点、破坏模式及抗剪承载力。基于此,建立分布式凹凸榫径向抗剪承载力计算模型。研究表明,分布式凹凸榫可限制错台,提高环缝抗剪能力,抑制斜螺栓进一步屈服和混凝土的进一步损伤;径向剪切时由于凸榫根部受压损伤严重导致承载力下降,高厚比k小于6时,凸榫有被整体剪切破坏的趋势,切向剪切时由于应力集中导致凹凸榫局部受压破坏;力学模型计算结果和数值模拟结果相符,可为分布式凹凸榫尺寸设计提供参考。To explore the shear resistance effect and failure mechanism of distributed mortise-and-tenon in the process of dislocation of large-diameter shield tunnel segments,a numerical model was established based on the Jihualu tunnel in Foshan.The laws of shear force-dislocation of circumferential joints under radial and tangential dislocation conditions were revealed.Furthermore,the mechanical characteristics,failure modes and shear bearing capacity of mortise-and-tenon with different sizes in different shear directions were analyzed.And a mechanical model calculating the radial shear bearing capacity of tenon was established.The distributed mortise-and-tenons can restrict lining dislocation,improve the shear resistance of circumferential joints,and inhibit further yielding of oblique bolt and further damage to the concrete.Compression damage of the root of the tenon is severe under radial dislocation condition,which causes the reduction of the shear bearing capacity.And the tenon tends to be sheared off when the height-thickness ratio k is less than 6.While tenon is damaged by local compression due to stress concentration under tangential condition.The calculation results of the mechanical model are consistent with the numerical simulation results,which can provide a reference for the design of the size of the distributed mortise-and-tenon.

关 键 词：盾构隧道 管片错台 分布式凹凸榫 数值模拟 受力特性 抗剪承载力 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]