Browsing by Author "Mamo Methe"

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    Assessment of Monitoring and Control Practices of Housing Project in Addis Ababa, The Case of Koye Feche Housing Project
    (Addis Ababa University, 2024-10) Mamo Methe; Zegeye Muluye (PhD)
    This research aimed to assess the monitoring and controlling practices within housingprojects in Addis Ababa, Ethiopia, focusing on the Koye Feche Akaki site. The study focuses on 20/80 condominium integrated housing development programs (IHDPs) atthe site. Drawing on existing literature, conceptual frameworks were developed to guide the research design and approach. Conceptual frameworks were created to direct theresearch design and methodology by drawing on previously published material. A questionnaire survey, document analysis, and a study of relevant literature were used tocollect and analyze the data. With the use of a quantitative research methodology and descriptive analysis, the study examined the shortcomings, restrictions, and difficultiesthat were present in the practices of monitoring and controlling within these housing developments. The findings revealed several critical areas that required attention, suchas inadequate quality control methods, monitoring procedures, resource scarcity, technological issues, and communication failures. Additionally, the study identifiedspecific shortcomings in the existing procedures, such as the need for advanced monitoring tools, comprehensive quality control systems, and effective lines ofcommunication. The challenges revealed included resistance to change, a lack of skilled personnel, insufficient data collection and reporting, and issues with regulatorycompliance. Enhancing resource allocation, stakeholder communication, data gathering, quality control procedures, flexibility, creativity, and regulatory complianceare all recommended by this research. Key Terms: Monitoring and controlling practices, Housing project, Challenges
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    Stability Analysis of Jointed Rock Mass Foundation of Concrete Gravity Dam and Slope Stability of Abutment
    (Addis Ababa University, 2023-12) Mamo Methe; Bayisa Regassa
    For high-performance operations and the safety of the dam structures, it is essential to study the rock mass foundation of major dams. Numerical modeling can be used to overcome some of the limitations associated with researching rock mechanics, such as the need for extensive laboratory testing for geotechnical engineering of dam foundations. Numerous researches have employed numerical modeling analysis to identify the failure model and resolve foundational issues pertaining to rock mechanics. The aim of this study is to examine and analyze the stability of the jointed rock mass foundation and abutment slope stability of Koysha RCC dam. The foundation of the concrete dam is affected by complex geology, and two sub-vertical joint sets and one sub-horizontal joint set are dipping sub-parallel to the river direction, frequently infilled with thick, soft compressible clay and decomposed rock remnants. The joints are cutting each other. In this research, a distinct element model (DEM) tool, namely 3DEC 5.20, is used to study and analyze the stability of the foundation. This model enables the building of material and joint models as discontinuous mediums. Secondary sources have been the main sources of the required material properties. The Mohr Coloumb elastic, completely plastic model served as a representation of the constitutive block model of the rock and soil components. Perfectly elastic joint model properties served as a representation of the joint qualities. In addition to the discontinuum medium, the equivalent continuum concept was used to reduce calculation times and simplify the study. The results of the central foundation analysis indicated that the jointed rock foundation of the dam was in a state of significant deformation along the infilled J2 joint under all loading conditions. The displacement keeps propagating laterally and vertically following the infill materials along the joint. The result of the abutment analysis revealed displacement of left crest foundation of the dam. From the compressional z-displacement and the pattern of the displacement along the infilled J2 joint set, the research concluded that the infilled material may be responsible for the deformation rather than the joint itself. Generally, the dam body and the whole rock mass foundation of the dam are found to be stable, except for zones of weakly infilled materials along the J2 joint. In order to improve these weak zones along the joint, remedial measures have recommended based on the results of the analysis carried out for improvement by cement grout.