The new remediation technique for buried pipelines under permanent ground deformation

Moradi M. | Galandarzadeh A. | Mahdi Rojhani

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=84823
Date :  2013/09/03
Publish in :    Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering

Link :  www.cfms-sols.org/sites/all/lic/pages/download_pdf.php?file=2371-2374.pdf
Keywords :technique, pipelines, permanent

Abstract :

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One part of lifelines is buried pipelines such as gas, water and oil pipelines. Permanent ground deformation such as fault crossing and lateral spreads is one of the more important threats for pipelines. In this research, a new remediation technique for buried pipeline system subject to permanent ground deformation is proposed. Also this new technique has been evaluated by centrifuge modeling of buried pipelines subjected to concentrated PGD. In proposed technique, the high porosity gravels are used as low-density backfill to fill the trench around the pipe near the susceptible area to PGD, thereby reducing soil resistance and soil-pipe interaction forces and also pipeline strains. Previously, the expanded polystyrene (EPS) geofoam proposed to reduce density of pipelines backfill. However, the high porosity gravel is better than expanded polystyrene geofoam from many cases such as workability to construct, environmental effect, durability and cost. In this technical paper, described the proposed technique and also two centrifuge modeling have been done to evaluate its performance. The comparisons of responses of remediated pipeline with unremediated pipeline have been shown that the proposed technique is effective considerably.

www.cfms-sols.org/sites/all/lic/pages/download_pdf.php?file=2371-2374.pdf