Mitiku, Biruk (2017) Engineering Geological Characterization and Suitability Analysis of Subgrade Soil: A Case Study on Selected Section of Ambo –Wolisso Road Project, South Western Ethiopia. Masters thesis, Addis Ababa University.
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Abstract
The performance of a pavement is highly controlled by the underlying roadbed soil geotechnical characteristics. A subgrade provides support for upper layers of a pavement structure that are constructed upon it and the traffic load. The purpose of geotechnical characterization of a subgrade is to evaluate the quality of the subgrade based on various results of insitu and laboratory test and sound geotechnical principles that would impact the pavement performance. In the present study the subgrade soils are characterized on selected section of Ambo-Wolliso road located in south western Ethiopia, Oromia region. The geographic location of the study area is bounded by UTM coordinate of 80 56’ N 370 52’ E and 8049’ N 37053’ E. the objective of the study were 1, to characterize the subgrade material based on the engineering geological parameters 2, to assess the suitability and bearing capacity of the subgrade soil 3, to suggest some counter measures for the unsuitable part of the subgrade soil. To achieve this objective, a total of 16 subgrade soil samples have been taken at 1km regular interval and tests were conducted at project geotechnical laboratory for the determination of Atterberg limit, specific gravity, Natural moisture content, grading, Maximum dry density and Optimum moisture content, California bearing capacity and swell value and hydrometer test is conducted at Addis Ababa university Engineering Geological laboratory. Finally, interpretation have been made with the data obtained from field works and laboratory investigation, supported by previous studies, research and standard manual of the subgrade characteristics. From the laboratory investigation it has been concluded that about 37.5 % of the subgrade soil is found to be unsuitable on the bases of bearing capacity. Hence, remedial measures such as removal and replacement, proper drainage design and blending with locally available materials are proposed.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Subgrade soil, Suitability Analysis, Expansive soil, Volcanic ash |
| Subjects: | Q Science > Q Science (General) Q Science > QE Geology T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 25 Sep 2018 09:40 |
| Last Modified: | 25 Sep 2018 09:40 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/5532 |
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