Stress and Deformation Analysis of Genale Dawa III Hydropower Concrete Faced Rock Fill Dam, Ethiopia
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Date
2023-10
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Addis Ababa University
Abstract
The deformation of the dam is a serious problem for the faced rockfill dam, so it is very important to analyze the stress and deformation of the concrete faced rockfill dam. Genale DawaIII hydropower CFRD is the dam in Ethiopia in which the study is conducted which aims to analyze the maximum stress and deformation. The finite element software Midas GTS NX is used to establish the model to analyze the stress and deformation of the Genale Dawa III hydropower concrete face rockfill dam. The stress and deformation characteristics of the concrete faced rockfill dam at the normal water storage condition, designed flood level condition, and normal water storage condition during the earthquake are obtained through analysis. Settlements, horizontal displacements, and principal stresses are evaluated for the above conditions, and these results are compared with each other in detail. The result shows that the maximum horizontal displacement is 60cm at the crest and vertical displacement 103cm occurs in normal water pressure with earthquake conditions. The computed maximum tensile stress at the concrete facing was found to be 1.94MPa, which is greater than the tensile strength of concrete (1.67MPa). This indicates that the tensile capacity of concrete is insufficient in the linear-elastic range, and hence non-linear analysis is required to ensure that no collapse would occur during the dam's life span. Additionally, the computed maximum compressive stress is 42.12MPa, which is significantly greater than the concrete's compressive strength (25.3MPa), justifying the need for additional studies using a non-linear analysis approach. The maximum major and minor principal stresses are located near the perimetric joint or on the concrete facing at the heel of the dam.
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Keywords
Deformation Analysis, Stress Analysis, Genale Dawa III Hydropower Concrete, Rock Fill Dam