Optimum Design of Highway Cut Slopes in some Selected Soils found in Ethiopia
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Date
2010-12
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Addis Ababa University
Abstract
This thesis presents the safe and economical highway cut slope design in some selected soils found in Ethiopia. The preparation of the standard has been carried out by determining the soil shear strength parameters in the laboratory and determining the safe and economical slope using the factor of safety contour charts.
In this work, first, factor of safety contour charts are produced. Using these charts existing slopes are assessed. In addition to collecting soil parameters from previously analyzed soil samples, three soil samples were collected for laboratory analysis. Using the compiled soil parametes and prepared factor of safety contour charts, cut slope standard tables are prepared for the different soils. Lastly, the output of this standard is compared with ERA 2002 cut slope standard for cost – benefit analysis.
Generally, it has been observed that the newly developed highway cut slope standard is safe and economical. For the cases investigated in this work, the reduction in cost ranges from 19 to 32% f that of the current ERA 2002 standard.
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Keywords
Slope Stability, highway cut slope, Factor of safety, Design Chart