| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 107 === In recent years, there are more and more hazards due to underground pipeline damages in Taiwan area. The main reasons for those incidences are the lack of professional knowledge about life cycle and maintenance requirement of underground pipelines. Aged pipelines need to be renewed or repaired to avoid the damage accidents and the induced economic losses. Due to the traffic under the impact of liner wrinkle on the performance of rehabilitated underground pipelines.
This study simulates various conditions, including liner wrinkles in curved and straight line pipelines. Fore the case of two wrinkles, the influence of spacing between two wrinkles, with different shapes, sizes and directions, are also studied. Different loading conditions, i.e. surface loads and internal pressure are also considered. In addition, the interaction between pipe wall damage, liner wrinkles, and pipeline are simulated and discussed.
The results of this study suggest that the liner wrinkles have a significant impact on the liner, i.e. the stress concentration and larger deformation. The larger the wrinkles, the larger the impact on the liner. When the pipeline wall damage is closer enough, the wrinkle will affect the reinforcing performance of the liner. When there are two wrinkles between the linings, the farther the two wrinkles are, the less the influence is. The lining wrinkles of the curved pipeline and the straight pipeline are also analyzed and discussed, and the influence of the curved pipeline is greater than that of the straight pipeline.
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