采用原位固化技术加固的高龄供水管道能够承担内水压荷载,但既有管道的孔洞缺陷为管周地下水提供了渗流通道,局部静水外压的激增造成内衬失稳失效。通过对DN 600和DN 1 000两组足尺管道静水外压试验和有限元分析,研究原位固化内衬在静水外压作用下的变形规律和失稳特征,探讨界面粘结条件下内衬DR值和椭圆度对内衬屈曲行为的影响规律。结果表明:内衬管在静水外压作用下经历了上浮、弯曲、极限外压屈曲、局部纤维断裂和内衬断裂5个阶段,界面的粘结强度对内衬屈曲的影响显著;采用原位固化技术修复供水管时应保证CIPP内衬与既有管道的粘结性能及粘结作用的耐久性。
The elderly water supply pipelines rehabilitated with cured-in-place-pipe (CIPP) technology can withstand internal water pressure loads. However, the existing pipeline's hole defects provide seepage channels for groundwater around the pipe, leading to a significant increase in local static water external pressure and causing instability and failure of the lining. Through static water external pressure tests and finite element analysis of two full-scale pipeline groups, DN 600 and DN 1000, this study investigates the deformation patterns and instability characteristics of the cured lining under the influence of static water external pressure. It explores the influence of lining DR values and ellipticity on the buckling behavior of the inner lining under interface bonding conditions. The results indicate that: The inner lining undergoes five stages under static water external pressure: uplift, bending, ultimate external pressure buckling, local fiber fracture, and lining fracture. The bonding strength of the interface significantly affects the buckling of the lining. When repairing water supply pipes using CIPP technology, it is essential to ensure the durability of the bonding performance and bonding effect between the CIPP lining and the existing pipeline.
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