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PROTECTION OF BURIED PIPES USING EPS GEOFOAM
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Volume Title: ICASGE2023
DOI: ICASGE-GEO
Authors
1Gehan Abd Rahaman; 2Abdullah Isaac 
; 3Mohamed Hussin Abdelaziz; Dr Gehan Abd Rahaman; Mohamed Hussin Abdelaziz
; 3Mohamed Hussin Abdelaziz; Dr Gehan Abd Rahaman; Mohamed Hussin Abdelaziz
1Professor of Soil Mechanics and Foundation, Faculty of Engineering, Fayoum University, Egypt
2Faculty of Engineering, Fayoum University, Egypt
3Associate Professor of Soil Mechanics and Foundation, Faculty of Engineering, Fayoum University, Egypt
Abstract
and finding solutions to improve the behavior of the pipe.
This research investigates the effects of using expanded polystyrene (EPS) geofoam as a compressible material (cover) upper the buried pipe to reduce the vertical stresses acting on flexible buried pipes and as a (foundation) element lower the buried pipe based on an experimental study.
An experimental model was carried out with dimensions depending on pipe diameter (D) and boundary condition. The flexible pipe is un-plasticized polyvinyl chloride (UPVC) installed in sand embedment with different densities with installing a layer of geofoam over and under the pipe (group 1), in sand underlying clay layer with installing a layer of geofoam over and under the pipe (group 2).
A series of experiments were carried out to measure the pipe displacement under static surface loading on the plate at the top of embedment by hydraulic jack with different cases simulating the pipe trench.
The experimental results showed installing layer of EPS geofoam block over the pipe reduced the deformation of flexible buried pipe compared with installing it under the pipe. The lower the density of the geofoam, the higher the degree of compressibility, and thus better absorption of the stress and also lower cost, the presence of a layer of soft clay at the bottom of the pipe and increases the displacement of the pipe and negatively affects the behavior of the pipe.
This research investigates the effects of using expanded polystyrene (EPS) geofoam as a compressible material (cover) upper the buried pipe to reduce the vertical stresses acting on flexible buried pipes and as a (foundation) element lower the buried pipe based on an experimental study.
An experimental model was carried out with dimensions depending on pipe diameter (D) and boundary condition. The flexible pipe is un-plasticized polyvinyl chloride (UPVC) installed in sand embedment with different densities with installing a layer of geofoam over and under the pipe (group 1), in sand underlying clay layer with installing a layer of geofoam over and under the pipe (group 2).
A series of experiments were carried out to measure the pipe displacement under static surface loading on the plate at the top of embedment by hydraulic jack with different cases simulating the pipe trench.
The experimental results showed installing layer of EPS geofoam block over the pipe reduced the deformation of flexible buried pipe compared with installing it under the pipe. The lower the density of the geofoam, the higher the degree of compressibility, and thus better absorption of the stress and also lower cost, the presence of a layer of soft clay at the bottom of the pipe and increases the displacement of the pipe and negatively affects the behavior of the pipe.
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