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| dc.contributor.author | BINYAM, GEZAHEGN | |
| dc.date.accessioned | 2022-11-30T07:29:24Z | |
| dc.date.available | 2022-11-30T07:29:24Z | |
| dc.date.issued | 2021-09 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/14617 | |
| dc.description.abstract | The use of underground buried pipes is growing fast in transporting clean water, sewage, telecom lines, gases and other chemicals. These buried pipe lines can affect the lives of people directly. Therefore, studies all over the world have been conducted on methods of protecting the pipelines; and those studies have suggested different scientific protection methods. On the contrary, the habit of protecting buried pipes in Ethiopia is very low. This is costing the country millions of dollars already. It is believed that this research will encourage the use of different new and economical protection methods. In this paper, the behavior of Steel buried pipes with the inclusion of expanded polystyrene (EPS) geofoam and geotextile reinforcement in different backfills (local soil, fly ash and quarry dust) was analyzed numerically. The contact pressure and the circumferential strain were the main parameters to discuss the performance of the pipes in those different cases. The research also studied the effect of pipe stiffness, pipe diameter, EPS geofoam thickness & location, tensile stiffness and the number of reinforcements on the performance of the pipe along with the protective materials. A finite element analysis software, i.e., Abaqus/CAE was utilized to fulfill the objectives of the study. The results indicated that the vertical pressure on the top of the steel pipe, which was installed at 3D from the surface, could be reduced up to 40.1% and 29.3% under EPS geofoam included and geotextile reinforced trenches respectively. Since the three backfills that were used in this study had comparable shear strength parameters, it did not alter the vertical stress on the pipes significantly and this result strengthens the idea of using fly ash and quarry dust as an alternative backfill material. However, the above results were affected by the thickness and location of EPS geofoam, the tensile strength of the reinforcement and the number of geotextile reinforcements provided. Moreover, it is found that the performance of the steel pipe was found to be affected by its diameter and stiffness. Finally, the combined use of EPS geofoam and geotextile gave a positive result in reducing both the vertical pressure on the pipe and the surface settlement. Keywords: Abaqus, EPS geofoam, Geotextile, Stone dust, Fly ash, Buried pipe | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | CIVIL AND WATER RESOURCE ENGINEERING | en_US |
| dc.title | NUMERICAL EVALUTION OF EPS GEOFOAM AND GEOTEXTILE FOR THE PROTECTION OF BURIED PIPES IN DIFFERENT BACKFILLS | en_US |
| dc.type | Thesis | en_US |
