典型交叉连接形式的承插式埋地管线地震响应分析  

Seismic response of buried socket pipelines with typical cross connections

作　　者：侯本伟[1] 刘嘉伟 张亚波 韩俊艳[1] 钟紫蓝 杜修力[1] HOU Benwei;LIU Jiawei;ZHANG Yabo;HAN Junyan;ZHONG Zilan;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《岩土工程学报》2025年第2期407-416,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(51978023);国家重点研发计划项目课题(2022YFC3003603)。

摘　　要：埋地管线的接口类型以及管线交叉连接形式,对管线结构地震响应造成较大影响。由于管线交叉处的受力和变形特征受到各分肢管线结构类型的影响,首先建立分肢直线型管线有限元模型,分析了地震波作用下柔性接口球墨铸铁管线(DIP)和刚性接口灰口铸铁管线(CIP)的接口张开量以及管土相对变位;然后分析了采用十字型、T型、L型和双T型交叉管件连接的管线地震响应特征,其中交叉管件与各分肢管线分别采用承插式和法兰式两种连接口,并比较了接口类型对各类交叉管件地震响应的影响规律。结果表明:对于地震波作用下不同接口类型的直线型管线,DIP柔性接口峰值张开量大于CIP刚性接口,CIP刚性接口管线轴力远大于DIP柔性接口管线。管线交叉处采用承插式接口时,双T型交叉管件连接的管线接口峰值张开量略小于十字型、T型连接。管线交叉处采用法兰接口时,与法兰口邻接的DIP柔性接口张开量较大、易发生拉伸破坏,与法兰口邻接的CIP刚性接口轴向压力较大、易发生受压破坏;在双T型交叉处,与法兰口邻接的承插接口响应显著大于十字型、T型连接。The joint type and cross connection pattern of buried pipelines have a significant impact on the seismic responses of pipeline structures.As the seismic deformation and stress of pipeline cross are determined by the structural types of branch pipelines,a finite element model for straight branch pipelines is firstly established to investigate the joint displacement and relative pipe-soil displacement of ductile iron pipelines(DIP)with flexible socket rubber joints and cast iron pipelines(CIP)with rigid joints under seismic wave propagation.Then,the seismic responses of pipeline connections using cross-shaped,T-shaped,L-shaped and double-T-shaped cross connections are analyzed,where the pipe cross is connected to the branch pipelines using the socket or flange joints.Furthermore,the effects of joint types on the seismic responses of pipeline cross connections are evaluated.The results show that for the straight pipelines with different types of joints,the peak joint displacement of the DIP with flexible joints is larger than that of the CIP with rigid joints.When the pipe cross is connected with the socket joints,the peak joint displacement of the pipelines with double-T-shaped cross is slightly smaller than that of the pipelines with cross-shaped and T-shaped connections.When the pipe cross is connected using the flange joints,the DIP with flexible joints adjacent to the flange joints exhibits a larger joint displacement and is prone to tensile failure,while the CIP with rigid joints adjacent to the flange joint experiences greater axial compressive force and is prone to compressive failure.At the cross of double-T-shaped pipelines,the responses of the socket joints adjacent to the flange joints are significantly larger than those of the cross-shaped and T-shaped connections.

关 键 词：埋地管线 交叉管线 地震波动 承插式接口 法兰接口 接口变形 

分 类 号：TU435[建筑科学—岩土工程]