A Study on the Backfill Loads on the Buried Metal-Polyethylene Composite Pipe(I) - In-situ test for the buried pipe and Finite Element Analysis -
01 Jan 1998-Vol. 18, pp 725-725
TL;DR: In this article, the variations of the backfill loads acting on the metal-polyethylene composite pipes buried in various trenches backfilled afterward were investigated, and the reliability of the finite element analysis used in this study was examined by an in-situ test for the buried pipe.
Abstract: The variations of the backfill loads acting on the metal-polyethylene composite pipes buried in various trenches backfilled afterward were investigated in this study. The reliability of the finite element analysis used in this study was examined by an in-situ test for the buried pipe. The backfill loads and deflections on the real-size pipe buried on-site were measured while increasing the backfill height. Further investigations were made for the variations of the backfill loads as a function of several important parameters such as backfill soil, backfill height(), diameter of the pipe(), and trench width(). The backfill load appears to be greater for clayey sandy soil(SC) than silty sandy soil(SM) with increasing the pipe diameter for the given backfill height, and with incresing the backfill height for the given pipe daimeter. The backfill load with 90% of compaction degree is gloater than that with 85%.
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TL;DR: In this article, a finite element model is built to reflect the soil properties, as well as the backfill and in-situ condition, and an equation for horizontal deflection of buried pipe considering soil-pipe interaction is proposed.
Abstract: The deflection of the buried pipe is a function of the load on the pipe, and also the load on the pipe is a function of the deflection. It is a typical soil-pipe interaction. The vertical deflection of buried pipe with the soil properties has been relatively well studied, however, there is no proper and practical guideline on the horizontal deflection of buried pipe considering the soil-pipe interaction. In practice, the horizontal deflection is considered as the same as the vertical deflection and it provides unnecessary conservative design. In this study, the deflection of buried prestressed concrete cylinder pipe is measured using a selected soil model. A finite element model is built to reflect the soil properties, as well as the backfill and in-situ condition. An equation for horizontal deflection of buried pipe considering soil-pipe interaction is proposed.
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