Abstract
Current design standards do not take account of soil variability along buried sewer pipes ignoring the longitudinal bending. However, considering the current installation practice it appears obvious that the bedding or loading conditions are not uniform. In order to quantify the amount of disorders that originate from the longitudinal pipe behavior a statistical analysis of CCTV inspections outcome gathered in the Greater Lyon, France is used. It appears indeed that the major part of the observed defects might be related to the longitudinal behavior. An explanation of this result may be given both by a statistical and numerical approach. A statistical model developed from the database helps to identify some factors that may contribute to the failure occurrence within buried pipes by longitudinal bending. The performed numerical 3D simulations analyze the effect of both the pipe joint and the most common bedding heterogeneities.
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