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The Role of Expanded Polystyrene and Geocell in Enhancing the Behavior of Buried HDPE Pipes under Trench Loading Using Numerical Analyses

1
Regional Technological Institute, University of West Bohemia, Univerzitní 8, 301 00 Pilsen, Czech Republic
2
Faculty of Civil Engineering, K.N.Toosi University of Technology, No. 1346, Valiasr Street, Mirdamad Intersection, Tehran 1996715433, Iran
*
Author to whom correspondence should be addressed.
Geosciences 2020, 10(7), 251; https://doi.org/10.3390/geosciences10070251
Received: 23 May 2020 / Revised: 26 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
In recent years, much research has focused on the use of various materials for relieving and strengthening soil, e.g., steel reinforcing ribs, geosynthetics, geocell, waste tires, and expanded polystyrene (EPS). EPS is being used increasingly in geo-infrastructure, being a super-light material, to replace part of the soil and decrease the ground pressure on buried structures. This paper presents experimental and numerical analyses of the effectiveness of expanded polystyrene and geocell reinforcement for ameliorating the behavior of unpressurized buried pipes exposed to surface loading. A 3-D finite element method (FEM) model of soil, geofoam, geocell, and piping was generated in ABAQUS, and the model was verified by experimental analyses conducted at a laboratory. The results show that reinforcing the soil cover with geocell and geofoam has a substantial impact, decreasing the maximum surface settlement by around 29% and maximum pipe crown displacement by up to 39.5%. In addition, the EPS block density can reduce the maximum pipe crown displacement substantially. View Full-Text
Keywords: EPS geofoam; buried pipe; geocell; reinforcement; numerical analysis EPS geofoam; buried pipe; geocell; reinforcement; numerical analysis
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Khalaj, O.; Azizian, M.; Joz Darabi, N.; Moghaddas Tafreshi, S.N.; Jirková, H. The Role of Expanded Polystyrene and Geocell in Enhancing the Behavior of Buried HDPE Pipes under Trench Loading Using Numerical Analyses. Geosciences 2020, 10, 251.

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