Evaluation the Performance of Railway Ballast Stabilized with Different Geosynthetic Materials - A Case Of Addis Ababa-Djibouti Railway Track Line
| dc.contributor.advisor | Tensay, Gebremedhin (PhD) | |
| dc.contributor.author | Nigist, Abera | |
| dc.date.accessioned | 2021-11-23T07:59:11Z | |
| dc.date.accessioned | 2023-11-04T15:17:31Z | |
| dc.date.available | 2021-11-23T07:59:11Z | |
| dc.date.available | 2023-11-04T15:17:31Z | |
| dc.date.issued | 2019-09 | |
| dc.description.abstract | Quality of track depends upon the proper functioning of ballast, which plays a significant role in providing support for the track base and distributing the loads to the subgrade. The freight traffic loads have an inherent effect on the railroad track line such as the deviation of track geometry from required conditions as a result of ballast degradation and substructure layer deformation. In order to overcome this problem and prolong the life of railroad tracks, preserving and enhancing the performance of the ballast layer is necessary. This study aims at evaluating the performance of different types of geosynthetic materials: geotextile, geogrid, and geocomposite for minimizing the deformation level of the ballast layer so as to improve the track capacity. To evaluate the performance of such geosynthetic materials, numerical simulations have been performed using a two-dimensional plane-strain Finite Element Analysis software PLAXIS-2D. The analysis is comprised of typical unreinforced and geotextile, geocomposite and geogrid reinforced ballasted track. The results show that intrusion of any of the three types of geosynthetics at the ballast sub-ballast interface can improve the ballast performance by minimizing its deformation level. According to the analysis results, the track settlement is reduced by 20%, 30%, and 55% while using geotextile, geogrid, and geocomposite, respectively. Thus, it has been concluded that an intrusion of the geocomposite at the ballast-sub-ballast interface has reduced the track settlement, and the subgrade stress much better than an intrusion of other geosynthetic materials. Furthermore, an attempt is carried out to obtain an optimum location of geosynthetics at which the geosynthetics are of the most effective for minimizing the deformation level of the ballast layer and it has been found out that its location does not have a significant effect on its capacity of reducing the track settlement. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/28894 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Track Capacity Improvement | en_US |
| dc.subject | Geosynthetic | en_US |
| dc.subject | PLAXIS 2D | en_US |
| dc.subject | Track Settlement | en_US |
| dc.subject | Subgrade stress | en_US |
| dc.subject | Strain Level | en_US |
| dc.title | Evaluation the Performance of Railway Ballast Stabilized with Different Geosynthetic Materials - A Case Of Addis Ababa-Djibouti Railway Track Line | en_US |
| dc.type | Thesis | en_US |