During the service life of a pipeline, the surrounding soil may erode locally around the pipe due to seepage and leakage, making the pipe partially unsupported and weakening the pipe–soil interaction. The presence of soil voids provides the possibility for broken wires and further accelerates damage. In this paper, the stress and strain of PCCP joint in service under a localized soil void and with broken wires were investigated using the general finite element software ABAQUS, and the structural damage of the pipe joint under superimposed defects was evaluated. The numerical model contained two PCCP segments, a flexible joint and the surrounding soil. The preliminary study suggests that the superimposed defects of a soil void and broken wires can cause increased damage to the PCCP joint. With the addition of the soil void, the micro cracks of both the concrete core and mortar coating transform into visible cracks, and the relative wire breakage rate with coupling defects is reduced by approximately 36% to reach the elastic limit state of the pipe. The findings of this research highlight the importance of good pipe–soil interactions and could provide a theoretical reference for damage assessment and further repair strategies.

在管道的使用寿命期间，由于渗漏和泄漏，管道周围的土壤可能会局部侵蚀，使管道部分失去支撑，削弱了管道与土壤的相互作用。土壤空隙的存在为断线提供了可能性，并进一步加速了损坏。本文利用通用有限元软件ABAQUS对局部土空洞断丝下在役PCCP接头的应力应变进行了研究，并对叠加缺陷下管接头的结构损伤进行了评价。数值模型包含两个 PCCP 段、一个柔性接头和周围的土壤。初步研究表明，土壤空隙和断丝的叠加缺陷会增加对 PCCP 接头的损坏。随着土壤空隙的增加，混凝土芯部和砂浆涂层的微裂纹均转化为可见裂纹，耦合缺陷的相对断线率降低约36%，达到管材的弹性极限状态。这项研究的结果强调了良好的管土相互作用的重要性，可以为损害评估和进一步的修复策略提供理论参考。