Foundation Construction on A Very Loose Sand Deposit (Literature Review and Cost Comparison of Foundations for A Case of Ziway Town)
| dc.contributor.advisor | Henock, Fikre (PhD) | |
| dc.contributor.author | Sofonias, Fresenbet | |
| dc.date.accessioned | 2019-05-25T08:56:03Z | |
| dc.date.accessioned | 2023-11-11T12:51:15Z | |
| dc.date.available | 2019-05-25T08:56:03Z | |
| dc.date.available | 2023-11-11T12:51:15Z | |
| dc.date.issued | 2019-05 | |
| dc.description.abstract | Ziway, is a town on the shore of Lake Ziway, a Rift Valley lake, in Oromia, Ethiopia. Lake Ziway is 62 km south of Addis Ababa. It has an elevation of 1643 meters above sea level. Geotechnical investigations show that starting from a few centimeters below the ground level to the depth of three meters, the soil in Ziway town is mostly silt and silty sand. The objective of this project is to investigate some of the mitigation measures implemented on very loose sand, understand the behavior of very loose sand deposit as a foundation material, compare the mitigation measures to be executed when constructing a foundation on very loose sandy soils, and design the appropriate type of foundation for the selected case study in Ziway town. The geotechnical investigation for the selected case study in ziway town shows that the soil sample has clay content ranging from 1.08 to 1.21%, silt fraction 24.58 to 25.68 %, sand fraction 71.14 to 72.84%, and gravel content from 1.11 to 1.24%. The specific gravity of the town ranges from 2.48 to 2.53.PI is non-plastic (NP). The maximum dry density (MDD) ranges from 1.17 to 1.25 g/cm3 and the optimum moisture content varies from 20.3 to 22.6 percent. Relative density test depicts the maximum void ratio to be (emax) 0.75 and minimum void ratio to be (emin) 0.35. cohesion varies 7.8-8.2 and angle of internal friction 27-27.8 degree. The mitigation measures proposed for the selected case study soil condition were mechanical compaction, vibrofloatation, stone columns, cement grouting or dynamic compaction to densify the soil. The soil under the foundation base was indicted to be compacted with a specified field density. The field density results were forwarded be checked regularly by using sand replacement or core cutter method. If mechanical compaction was used, it was instructed to compact the soil at a fully dry state or by flooding. The depth of compaction was proposed to stretch up to the depth of influence of the foundation that is 1.5*B.SPT test can also be used as an alternative measure to determine the level of increment in the bearing pressure of the soil after it has been compacted. The appropriate type of foundation was selected for the prevalent soil condition. In doing so, we considered three different approaches and combinations of footings that might be adequate for the specified structure. After a number of trials, we came to the conclusion that isolated foundation is the appropriate type of foundation for the structure and soil conditions considered in our study. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/18323 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | cost comparison of foundations | en_US |
| dc.subject | Ziway town | en_US |
| dc.subject | Foundation | en_US |
| dc.subject | construction | en_US |
| dc.subject | sand deposit | en_US |
| dc.title | Foundation Construction on A Very Loose Sand Deposit (Literature Review and Cost Comparison of Foundations for A Case of Ziway Town) | en_US |
| dc.type | Thesis | en_US |