Stabilizing Expansive Subgrade Soil on a Selected Road Section in Eastern Part of Ethiopia in Somalia Region Jigjiga Tuli
| dc.contributor.advisor | Geremew, Zemenu (PhD) | |
| dc.contributor.author | Negash, Sisay | |
| dc.date.accessioned | 2021-11-29T07:27:29Z | |
| dc.date.accessioned | 2023-11-09T14:13:07Z | |
| dc.date.available | 2021-11-29T07:27:29Z | |
| dc.date.available | 2023-11-09T14:13:07Z | |
| dc.date.issued | 2021-09-18 | |
| dc.description.abstract | The long-term performance of any construction project depends on the soundness of the underlying soils. Unstable soils can create significant problems for pavements or structures. In order to avoid most of the problems that has been appearing on the upper layer of any pavement it is better to treat the subgrade soil. To achieve the research objectives, subgrade soils samples were collected along the corridor of the road section and evaluated for their physical and geotechnical properties. The laboratory results of previous investigations on the area show that approximately 71 percent of the existing soil has a plastic index (PI) ranging from 27 to 35 percent and a liquid limit (LL) ranging from 55 to 70 percent with an average of 62.5 percent and <5% California bearing ratio (CBR) and approximately 89 percent of the swell values are greater than 2%. This reveals that the sub-grade soil along the route project is primarily characterized by A-7-5 and A-7-6 according to the American Association of State Highway and Transportation Officials (AASHTO) and fat clay (CH) and elastic silt (MH) of UCS soil classification which is considered as a problematic soil for subgrade materials. The swelling pressure of natural subgrade soil was determined using the laboratory to evaluate the fill height of the embankment on the geotechnical properties of soil. Because the swelling pressure of the sub-grade material has a medium swell potential and low potential heave, so soil replacement of only shallow soil not exceeding 30 cm is sufficient (only for the selected stretches) to equalize the swelling pressure of the existing soil with lower swelling potential, higher workability, and stabilized soils were feasible to be used as subgrade materials. | en_US |
| dc.identifier.uri | http://10.90.10.223:4000/handle/123456789/29017 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Stabilizing Expansive Subgrade Soil | en_US |
| dc.subject | Selected Road Section | en_US |
| dc.subject | Eastern Part | en_US |
| dc.subject | Ethiopia | en_US |
| dc.subject | Somalia | en_US |
| dc.subject | Region Jigjiga-Tuli | en_US |
| dc.title | Stabilizing Expansive Subgrade Soil on a Selected Road Section in Eastern Part of Ethiopia in Somalia Region Jigjiga Tuli | en_US |
| dc.type | Thesis | en_US |