Investigation On Some Of The Engineering Characteristics Of Soils In Adama Town Ethiopia

Investigation of the ground conditions is used for the economical design of the subrnstructural elements. It is also necessary to obtained sufficient information on type,rncharacteristics and distributions of a soil and rock underlying at a site of proposedrnstructures for feasibility and economic studies for the proposed project.rnThe objective of this research is to investigate the engineering property of soil found inrnAdama town. To achieve its objective samples from different parts of the city wererncollected and laboratory tests were done on the collected samples.rnThe grain size analysis test result showed that the dominant proportion of soil particlernin the research area is silt, which have clay content ranging from 5.4 – 40 5%, silt factionrn17.6 - 60.7%, sand fraction 14.5 - 54.6% and gravel content from 0.0 – 24.8%.rnThe result of Atterberg Limit test on the soil in the research area showed a liquid limitrnranging from 29 – 73%, plastic limit ranging from 21 – 35% and plastic index from 13 –rn34%.rnThe Specific Gravity ranges from 2.40 to 2.70. Free swell test conducted on the samplesrncollected shows range from 18 – 50%.rnFrom the compaction test results the maximum dry density (MDD) of Adama soilrnranges from1.20 to 1.62 g/cm3 and the optimum moisture content ranges 17.5 to 36.5rnpercent.rnAccording to the Unified Soil Classification System, the soil is categorized as silt andrnsilty sand. The AASHTO Classification System shows that the usual types of significantrnconstituent materials of the Adama soil are silt soil and clayey soil.rnFinally one-dimensional consolidation test was done and it shows that the area underrninvestigation is over consolidated in its natural state, have compression index rangingrnIXrnfrom 0.33-0.40, recompression index ranging from 0.017-0.066, coefficient ofrnpermeability ranging from 10-7 to 10-9 cm/sec and modulus of compressibility rangingrnfrom 3600-7500 kPa.

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