矩形顶管隧道F型承插接头剪切刚度分析  

Shear Stiffness Analysis of F-Socket Joint in Rectangular Pipe Jacking Tunnel

作　　者：许有俊 康佳旺[1,4] 张朝 庞跃魁 黄正东[1] 张旭 XU Youjun;KANG Jiawang;ZHANG Chao;PANG Yuekui;HUANG Zhengdong;ZHANG Xu(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China;Academician Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China;Research Center of Urban Underground Engineering of Inner Mongolia Autonomous Region,Baotou Inner Mongolia 014010,China;JSTI Group Co.,Ltd.,Nanjing Jiangsu 210019,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010 [2]内蒙古科技大学矿山安全与地下工程院士专家工作站,内蒙古包头014010 [3]内蒙古科技大学内蒙古自治区高校城市地下工程研究中心,内蒙古包头014010 [4]苏交科集团股份有限公司,江苏南京210019

出　　处：《中国铁道科学》2024年第2期113-122,共10页China Railway Science

基　　金：国家自然科学基金资助项目(51868062)。

摘　　要：矩形顶管F型承插接头属于柔性接头,地表超载、地基不均匀沉降等极易导致管节间出现剪切错台变形,进而引发隧道工程灾害。基于目前研究中对该种接头剪切力学特性尚不清楚的现状,考虑矩形顶管隧道F型承插接头构造特征,结合室内接头试验和ABAQUS三维精细化数值模拟,针对接头在剪切荷载下的破坏过程、刚度特性及影响因素等问题开展研究。结果表明:矩形顶管接头发生剪切破坏时,受载管节呈中心对称破坏;不同地层中接头的剪力-剪切位移曲线均分为建立接触阶段、钢套环翘曲阶段和焊缝开裂3个阶段,地基刚度越大时,其相对剪切刚度越大;钢套环厚度和宽度增加时,刚度系数值随之提高;随着钢套环宽度、厚度增大,接头抗剪能力随之提高,但提高的幅度有限,不同厚度、宽度钢套环的屈服阶段刚度系数约为弹性阶段的60%~70%。The rectangular pipe jack F-type socket joint is a flexible joint.The overloading of the surface and the uneven settlement of the foundation can easily cause the shear misalignment of the pipe joints,leading to tunnel engineering disasters.Based on the fact that the shear mechanical characteristics of the joint are still unclear in current research,the failure process,stiffness characteristics and influencing factors of the joint under shear load were studied by considering the structural characteristics of the F-type joint in the rectangular pipe jacking tunnel,combined with laboratory joint tests and ABAQUS three-dimensional precision numerical simulations.The results show that when the rectangular pipe jacking joint shear failure occurs,the loaded pipe joint presents a centrosymmetric failure.The shear force-shear displacement curves of joints in different strata are divided into three stages:the contact building stage,the steel ring warping stage and the weld cracking stage.The greater the foundation stiffness,the greater the relative shear stiffness.The stiffness coefficient increases with the increase of the thickness or the width of the steel bushing.With the increases of the width and thickness of the steel bushing,the shear resistance of the joint increases,while the increase range remains limited.The stiffness coefficient of the steel bushing at the yield stage is about 60%-70%of the elastic stage.

关 键 词：隧道工程 矩形顶管 剪切破坏特征 剪切刚度 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]