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In several countries, the Martson load theory is used in computing the trench backfill loads on rigid pipes. Germany is using an alternative design method for rigid and flexible pipe. This paper presents the two methods and a comparison realised on vitrified clay pipe. This comparison shows by using a loading ratio that the Marston theory is conservative. This ratio is the ratio between the applied load computed by both methods. Results of the comparison demonstrate that the Marston theory is very conservative for small pipes well backfilled with well-compacted granular materials because it neglects the load relieving effect of the side of the fill and underestimates the friction between backfill soil and trench walls.

Comparaison entre l’approche de Marston et l’approche allemande de conception structurelle des conduites rigides enterrées