Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes
This paper presents experimental investigations on buried Glass Reinforced Plastic (GRP) pipes with a diameter of 1400 mm. The tested pipes were buried in dense, gravelly sand and subjected to traffic loads to study the effects of backfill cover on pipe deflection. The experimental program included...
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MDPI AG
2024-08-01
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| author | AbdulMuttalib I. Said Yahya Jabbar Hussien Mohammed Hazim Mohammed Abbas A. Allawi Teghreed H. Ibrahim Ayman El-Zohairy Ahmed M. Abdelbaset |
| author_facet | AbdulMuttalib I. Said Yahya Jabbar Hussien Mohammed Hazim Mohammed Abbas A. Allawi Teghreed H. Ibrahim Ayman El-Zohairy Ahmed M. Abdelbaset |
| author_sort | AbdulMuttalib I. Said |
| collection | DOAJ |
| description | This paper presents experimental investigations on buried Glass Reinforced Plastic (GRP) pipes with a diameter of 1400 mm. The tested pipes were buried in dense, gravelly sand and subjected to traffic loads to study the effects of backfill cover on pipe deflection. The experimental program included tests on three GRP pipes with backfill covers of 100 cm, 75 cm, and 50 cm. The maximum traffic loads applied to the pipe–soil system corresponded to Iraqi Truck Type 3 (AASHTO H type). Vertical deflections of the pipes were monitored during the application of these loads. The experimental results showed that, as the backfill cover increased, the maximum vertical deflection of the pipe decreased. Deflection reductions were 38.0% and 33.3% when the backfill increased from 50 cm to 100 cm and from 50 cm to 75 cm, respectively. A 500 mm compacted backfill cover was found to be sufficient to resist traffic loads, with the vertical deflection percentage remaining below the allowable limit. Additionally, the behavior of the GRP pipes under different traffic load configurations was analyzed using finite element (FE) analysis with Plaxis 3D. The model was validated using field data. The study investigated numerous variables impacting the behavior of embedded pipes, including pipe material, pipe thickness, backfill properties, backfill depth, and the properties of the soil beneath the GRP pipe. The deflections of the steel pipe were lower than those of the GRP pipe when using different thicknesses. |
| format | Article |
| id | doaj-art-3b8607b17ffb4a24b9ddcc3ab3e53f32 |
| institution | OA Journals |
| issn | 2673-4109 |
| language | English |
| publishDate | 2024-08-01 |
| publisher | MDPI AG |
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| series | CivilEng |
| spelling | doaj-art-3b8607b17ffb4a24b9ddcc3ab3e53f322025-08-20T01:55:22ZengMDPI AGCivilEng2673-41092024-08-015364667210.3390/civileng5030035Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP PipesAbdulMuttalib I. Said0Yahya Jabbar Hussien1Mohammed Hazim Mohammed2Abbas A. Allawi3Teghreed H. Ibrahim4Ayman El-Zohairy5Ahmed M. Abdelbaset6Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad 17001, IraqDepartment of Civil Engineering, College of Engineering, University of Baghdad, Baghdad 17001, IraqMinistry of Higher Education and Scientific Research, Baghdad 17001, IraqDepartment of Civil Engineering, College of Engineering, University of Baghdad, Baghdad 17001, IraqDepartment of Civil Engineering, College of Engineering, University of Baghdad, Baghdad 17001, IraqDepartment of Engineering and Technology, Texas A&M University-Commerce, Commerce, TX 75429, USAStructural Engineering Department, Zagazig University, Zagazig 44519, EgyptThis paper presents experimental investigations on buried Glass Reinforced Plastic (GRP) pipes with a diameter of 1400 mm. The tested pipes were buried in dense, gravelly sand and subjected to traffic loads to study the effects of backfill cover on pipe deflection. The experimental program included tests on three GRP pipes with backfill covers of 100 cm, 75 cm, and 50 cm. The maximum traffic loads applied to the pipe–soil system corresponded to Iraqi Truck Type 3 (AASHTO H type). Vertical deflections of the pipes were monitored during the application of these loads. The experimental results showed that, as the backfill cover increased, the maximum vertical deflection of the pipe decreased. Deflection reductions were 38.0% and 33.3% when the backfill increased from 50 cm to 100 cm and from 50 cm to 75 cm, respectively. A 500 mm compacted backfill cover was found to be sufficient to resist traffic loads, with the vertical deflection percentage remaining below the allowable limit. Additionally, the behavior of the GRP pipes under different traffic load configurations was analyzed using finite element (FE) analysis with Plaxis 3D. The model was validated using field data. The study investigated numerous variables impacting the behavior of embedded pipes, including pipe material, pipe thickness, backfill properties, backfill depth, and the properties of the soil beneath the GRP pipe. The deflections of the steel pipe were lower than those of the GRP pipe when using different thicknesses.https://www.mdpi.com/2673-4109/5/3/35large-diameter GRP pipebackfill coverdeflectionexperimentalfinite element |
| spellingShingle | AbdulMuttalib I. Said Yahya Jabbar Hussien Mohammed Hazim Mohammed Abbas A. Allawi Teghreed H. Ibrahim Ayman El-Zohairy Ahmed M. Abdelbaset Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes CivilEng large-diameter GRP pipe backfill cover deflection experimental finite element |
| title | Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes |
| title_full | Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes |
| title_fullStr | Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes |
| title_full_unstemmed | Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes |
| title_short | Experimental and FE Investigations of Backfill Cover on Large-Diameter GRP Pipes |
| title_sort | experimental and fe investigations of backfill cover on large diameter grp pipes |
| topic | large-diameter GRP pipe backfill cover deflection experimental finite element |
| url | https://www.mdpi.com/2673-4109/5/3/35 |
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