Thesis Open Access

# CAUSATIVE GEOTECHNICAL PROPERTIES OF SOILS FOR GULLY FORMATION: A CASE OF WORABE AREA

TEWODROS NIGUSSIE HABTE

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
<dc:creator>TEWODROS NIGUSSIE HABTE</dc:creator>
<dc:date>2019-11-07</dc:date>
<dc:description>Despite the seriousness of soil erosion and gully formation problems prevalent in Worabe area, limited investigation and researches have been carried out. This research aims to investigate the geotechnical properties of soils that contributes the formation of gully, and provides its mitigation measures. In order to attain the objectives, different journals, books, previous studies, and papers related to soil investigation and index properties of soils has been reviewed. During field work, visual identification of soils, test pitting, logging, disturbed and undisturbed soil sampling were done. Laboratory test results show that the gully soils are dominated on average by 3.26% Sand, 3.43% Silt and 93.31% Clay. The Liquid Limit varies from 32.5 to 76.6%, and Plasticity Index from 10.54 to 40.06%. The Shrinkage Limits varies from 5.71 to 21.43% and the Free Swell from 40 to 80. The Unified Soil Classification System shows that the gully soils are composed
of 11.8% Silt (ML), 17.6% Elastic Silts (MH), 23.5% Fat Clays (CH) and 47.1% Lean Clays
(CL). The Specific Gravity of the soil samples varies from 2.50 to 2.59, the optimum Moisture Content ranges from 23.2% to 23.1%, while the Maximum Dry Density ranges from 1.16g/cm3 to 1.57g/cm3. The Over Consolidation Ratio of the top soil is greater than 1. The results obtained in this investigation, especially from the Atterberg limit, sieve analysis, compaction test and specific gravity tests, show that the soils are cohesive soils with low dry densities and low specific gravity which mainly contributes the initiation of erosion gully formations in the study area. Of all the preventive and mitigation measures, vegetation is the simple and most effective way of keeping the soil stable. However, a combination of effective structures coupled with vegetation will give rise to a very productive way of combating erosion gully hazard in the study area.
</dc:description>
<dc:language>eng</dc:language>
<dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
<dc:subject>Words: Gully Formation, Geotechnical Properties. Specific Gravity, Maximum Dry Density, Optimum Moisture Content, Mitigation Measures, Worabe,</dc:subject>
<dc:title>CAUSATIVE GEOTECHNICAL PROPERTIES OF SOILS FOR GULLY FORMATION: A CASE OF WORABE AREA</dc:title>
<dc:type>info:eu-repo/semantics/doctoralThesis</dc:type>
<dc:type>publication-thesis</dc:type>
</oai_dc:dc>

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