In Situ and Laboratory Testing of Small Diameter PVC Irrigation Pipes for Investigation of Fatigue Failure

The responses of small PVC pipes to construction stress, traffic load, and internal pressure were measured in the field. The strain in the pipe top rapidly increased by compaction and it remained after compaction. The deformation of the pipe caused by internal pressure did not only inflate uniformly, but it also deformed to the shape of a true circle. The strain increments caused by a 20.7-ton truck load were 70 μ or less, which was much smaller than those caused by water fluctuations in the field. In addition, a cyclic load test was conducted on a pipe excavated after 11 years in operation. A crack occurred at a deflection ratio of only 1.5% in the cyclic load test, although no crack occurred at a deflection ratio of 50% in the flattening test. These results implied that PVC pipes in the field may break because of fatigue, due more to water fluctuations than to traffic loads.

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  • English

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  • Accession Number: 01685956
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 2 2018 10:34AM