Hunde, Sintayehu (2003) Investigation of Influence of Compaction on the Stability of Earthfill Dams of Tropical Soils. Masters thesis, Addis Ababa University.
![[img]](http://thesisbank.jhia.ac.ke/style/images/fileicons/application_pdf.png) |
PDF (Investigation of Influence of Compaction On the Stability of Earthfill Dams of Tropical Soils)
Sintayehu Hunde.pdf - Accepted Version Restricted to Repository staff only Download (1MB) | Request a copy |
Abstract
Dam construction is one of the major civil engineering activities, which enhance development. If the construction of such infrastructures can be achieved within sound technical and affordable financial capacity, then it is possible to realize the dream for development and well-to-do life. One of the merits of earth fill dams is that they can be constructed from locally available natural material (soil) within sound technical and affordable financial capacity. For soils of a given locality to be used safely and economically, appropriate methods of determining the geotechnical properties and shear strength parameters have to be investigated and developed. In addition to this, the appropriate methods of compacting locally available tropical soils have to be developed. Accordingly, in this paper the influence of compaction on the stability of small earth fill dams of local tropical soils has been investigated. In addition to this, some peculiar geotechnical and geo-chemical characteristics of local tropical soils that have been used in construction of earth fill dams have been studied. Accordingly, the fill material of the cofferdam of Gilgel Gibe Hydroelectric Project has been obtained to be true laterite, while the core material of Dire Dam and the red clay soil of Addis Ababa (Semen Gebeya Area) have been obtained to be lateritic. The soil samples were compacted at optimum moisture content, at drier of the optimum moisture content and at wetter of the optimum moisture contents. Then, triaxial tests were done on the soil samples to investigate the variation in shear strength properties of these soils, which ultimately affect the stability of the earth fill dams. Compaction moisture has been obtained to influence the stability of earth fill dams. Samples compacted on the drier side of optimum moistures registered high shear strengths. But these strengths were observed to be lost upon further increasing the compaction moisture and also upon sample saturation. Variation of permeability of compacted soils with respect to compaction moistures and also the effect of saturation settlements were investigated. Accordingly, Permeability has been obtained to decrease towards the optimum moisture content. On the drier and wetter sides of the optimum, higher values of coefficients of permeability have been obtained. The problem of saturation settlement has been observed to occur when the soil is compacted on the drier side of the optimum moisture.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Civil Engineering |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) Q Science > QE Geology T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 27 Nov 2018 10:50 |
| Last Modified: | 27 Nov 2018 10:50 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7797 |
Actions (login required)
 |
View Item |