Evaluation Ofalternative Track Alignments on Whole Life Cost of Lot 11 Section of the Awash Weldiya Railway Line

Abebe, Muna (2015) Evaluation Ofalternative Track Alignments on Whole Life Cost of Lot 11 Section of the Awash Weldiya Railway Line. Masters thesis, Addis Ababa University.

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Geometric design is an essential and major component in the design development of railway projects. Geometric alignments (horizontal and vertical) affect project cost and safety significantly keeping other factors constant. The effect of track alignment on cost of awash-weldiya railway project in particular to Lot-11 stretch is evaluated in this thesis. Three different horizontal and vertical alignments are designed and their respective costs computed and compared. In the design process, topographic data is generated from 30m Resolution Digital Elevation Model using Global Mapper software. Horizontal and vertical alignments are designed using widely applicable Bentley Rail Track (BRT) software. In this thesis, Ethiopian Railways Corporation manual is used as governing rail standard. Basic techniques are applied for economical and safe design of the project. Generally, a minimum curve radius of 2000m and a maximum gradient of 2% is applied but a deviation from the standard is made in some parts due to topographic and other constraints. Accordingly, horizontal curves as low as 500m and gradient as high as 2.5% have been used in some places where there is topography constraint. The main parameters that are considered to evaluate the impact of track alignment on cost of the project are: earth work quantity, length of project, tunnel length, length of swampy section, total number of structures and total span of structures. Critical sections are identified along potential corridor routes and then different sensitivity analysis has been applied on these critical sections before final decision is made. Prioritization of alternative routes has been made based on construction cost, operational cost and safety comparisons to identify the most economical and low risk alternative alignment. According to the analysis, from the three alternatives alignments compared, alternative II is economical but alternative III has low risk of construction while alternative I fulfills the required design criteria of the standard better than the other two alignments.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Horizontal alignment, Curve, Vertical alignment, Cost, and Safety.
Subjects: H Social Sciences > HF Commerce
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TF Railroad engineering and operation
Divisions: Africana
Depositing User: Andriamparany Edilbert RANOARIVONY
Date Deposited: 19 Jul 2018 06:52
Last Modified: 19 Jul 2018 06:52
URI: http://thesisbank.jhia.ac.ke/id/eprint/7365

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