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Title: Geotechnical Characterization of Sub grade Materials for Pavement Construction, A case Study on Aposto – Wondo – Negele Road Upgrading Project, Contract 2: IrbaModa ~ Wadera Road Construction Southern Ethiopia
Authors: Nibret, Chane
Advisors: Tarun K.Raghuvanshi(Dr.)
Keywords: Negele
Copyright: Jun-2011
Date Added: 20-Jul-2012
Publisher: Addis Ababa University
Abstract: Sub grade soils and materials characterizations are the main parameter for flexible pavement both in the design and construction phases. Expansive soils in construction sites do have significant influence on planning, structural design, construction and maintenance costs, performance and engineering life of roads and highways. They are susceptible to considerable volume changes in response to fluctuations in groundwater table and moisture content following seasonal climatic variations. This property can cause severe damages to infrastructure unless proper measures are taken in the design and construction phases. Identification of expansive soils and characterization of their anticipated behavior is thus important for pavement structure & drainage design, and estimating the cost, mitigating their undesirable properties. Hence to mitigate the possible damages, sub grade soils and materials characterization have been conducted. The sub grade soils and materials characterization is conducted at Aposto ~ Wondo ~ Negele road upgrading project, contract 2: Irbamoda Wadera Road construction located in Adola Rede woreda, Gujji Administrative zone of Oromia Region, The geographic locations for the study area is bounded by UTM coordinates of 490698 E, 656488 N and 507644 E, 648577 N. The main objectives of the study were: (1) to classify the sub grade soils in to homogenous classes (2) to propose remedial measures for the unsuitable part of the sub grade soils and (3) to propose alternative pavement thickness design. To achieve these objectives, a total of 112 sub grade soils samples have been taken at 200m regular interval and tests are also conducted at project geotechnical laboratory for the determination of Atterberg limits, grading, MDD and OMC, CBR and swell values. Interpretations have been made with the data obtained from field works and laboratory investigations, supported by previous studies and researches. In addition, geological data have also been incorporated. From the laboratory investigation, it has been concluded that at least 82% of the sub grade soils are found to be suitable for bearing stratum and construction materials. Mechanical stabilization methods have been proposed for the unsuitable section. After evaluating the pavement structure thickness conducted by the design review consultant, alternative pavement design approaches have been forwarded. Based on the results and findings, certain recommendations have also been given. These recommendations are removal and replacement, in situ treatement, rock fill with geo textiles and underground drains.
Description: A thesis submitted to school of graduate studies of Addis Ababa University in partial fulfillment of the requirements for the Degree Of Master of Science in Engineering Geology.
URI: http://hdl.handle.net/123456789/3459
Appears in:Thesis - Earth Sciences

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