矩形顶管隧道F型承插接头剪切性能研究  

Shear performance of F-type socket joint in rectangular pipe jacking tunnel

作　　者：许有俊 庞跃魁[1,2] 张朝 康佳旺 黄正东[1] XU You-jun;PANG Yue-kui;ZHANG Chao;KANG Jia-wang;HUANG Zheng-dong(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Academician Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou,014010,China;Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Science and Technology,Baotou 014010,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“城市地下工程技术研究中心”,内蒙古包头014010

出　　处：《浙江大学学报（工学版）》2023年第5期957-966,共10页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51868062).

摘　　要：通过接头剪切试验研究在地基沉降、施工扰动及上部荷载变化等情况下矩形顶管隧道的F型承插接头剪切受力性能及变形特征.通过在管节底部布置等效地基弹簧的方式,模拟不同地层条件下土体对矩形顶管的支撑作用.结果表明:在管节接头发生剪切变形过程中,钢套环刚度与地基刚度越大,接头抗剪承载能力越强,错台量越小.钢套环焊缝强度严重制约管节的承载能力,裂缝出现使得接头的抗剪承载力下降29.5%~51.5%.在剪切作用下,接头钢套环容易发生翘曲变形或者焊缝开裂,接头处与钢套环接触的混凝土容易被压碎,接头根部混凝土容易开裂.Joint shear tests were carried out to study the shear force performance and deformation characteristics of the F-type socket joint in rectangular pipe jacking tunnel under the conditions of foundation settlement,construction disturbance and upper load change.The supporting function of soils under different geological conditions on the rectangular pipe jacking was simulated by setting equivalent foundation springs at the bottom of the pipe.Results showed that during the shear deformation of joint,the greater the stiffness of steel ring and foundation is,the greater the shear force of the joint is,and the smaller the change of dislocation is.The strength of the steel ring weld seriously restricts the bearing capacity of the joint,and the damage of weld reduced the shearing capacity of the joint by 29.5%—51.5%.The steel ring at the joint is prone to the warping deformation or seam weld cracking under the shearing action.The concrete in contact with the steel ring at the joint is easy to be crushed,and the concrete at the root of the joint is subject to crack.

关 键 词：矩形顶管 F型承插接头 剪切刚度 受力性能 失效机制 

分 类 号：U45[建筑科学—桥梁与隧道工程]