The integrity of rigid pipes is significantly affected by differential ground settlements, which can inevitably induce excessive stress in the pipeline and even cause structural failure. The mechanical responses of bell-spigot jointed rigid pipes, e.g., joint shearing and barrel bending, can change remarkably, when the shear band induced by normal fault offsets passes the pipeline through a pipe joint or the midspan of a pipe segment. A systematic analytical evaluation on mechanical response of bell-spigot jointed vitrified clay (VC) pipes to ground subsidence was conducted in this study. Firstly, based on the results of laboratory full-scale test and three-dimensional finite element analysis, the development of soil resistance and bending curvature along the VC pipeline during the offset process was analyzed. Then simplified analytical solutions were proposed for estimating the maximum longitudinal bending curvature and the joint shear force in the most unfavorable pipe segment. Parametric studies were conducted to evaluate the sensitivity of burial depth and soil properties to the pipe response. Results show that the estimations using the proposed solutions agreed with the experimental measurements and numerical simulations well. The maximum allowable offset distance for pipe safety reduced significantly with the increment of burial depth, and increased gently when pipes were buried in less compacted soils. Finally, the most vulnerable portions in the VC pipeline subjected ground subsidence were discussed.

刚性管道的完整性会受到不同的地面沉降的明显影响，这不可避免地会在管道中引起过大的应力，甚至会导致结构故障。当由正常断层偏移引起的剪切带穿过管道通过管接头或管段的中跨时，钟形接头连接的刚性管的机械响应（例如，接头剪切和机筒弯曲）会发生显着变化。本研究对钟形接缝的陶瓷黏土（VC）管对地面沉降的机械响应进行了系统的分析评估。首先，基于实验室全尺寸试验和三维有限元分析的结果，分析了胶结过程中沿VC管道的土壤阻力和弯曲曲率的变化。然后提出了简化的分析解决方案，以估计最不利的管段中的最大纵向弯曲曲率和联合剪切力。进行了参数研究，以评估埋藏深度和土壤性质对管道响应的敏感性。结果表明，使用所提出的解决方案进行的估计与实验测量和数值模拟非常吻合。管道安全的最大允许偏移距离随着埋深的增加而显着降低，而当管道被埋在压实度较低的土壤中时，其最大允许偏移距离会逐渐增大。最后，讨论了VC管道中最易受地面沉降的部分。进行了参数研究，以评估埋深和土壤性质对管道响应的敏感性。结果表明，使用所提出的解决方案进行的估计与实验测量和数值模拟非常吻合。管道安全的最大允许偏移距离随着埋深的增加而显着降低，而当管道被埋在压实度较低的土壤中时，其最大允许偏移距离逐渐增大。最后，讨论了VC管道中最易受地面沉降的部分。进行了参数研究，以评估埋藏深度和土壤性质对管道响应的敏感性。结果表明，使用所提出的解决方案进行的估计与实验测量和数值模拟非常吻合。管道安全的最大允许偏移距离随着埋深的增加而显着降低，而当管道被埋在压实度较低的土壤中时，其最大允许偏移距离逐渐增大。最后，讨论了VC管道中最易受地面沉降的部分。管道安全的最大允许偏移距离随着埋深的增加而显着降低，而当管道被埋在压实度较低的土壤中时，其最大允许偏移距离逐渐增大。最后，讨论了VC管道中最易受地面沉降的部分。管道安全的最大允许偏移距离随着埋深的增加而显着降低，而当管道被埋在压实度较低的土壤中时，其最大允许偏移距离逐渐增大。最后，讨论了VC管道中最易受地面沉降的部分。