Building Foundation Characterization Analysis: a Case Study in Ayat Area, Bole Sub-City, Addis Ababa, Central Ethiopia

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2017-05

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Addis Ababa Universty

Abstract

The present research study was conducted in North-Eastern part of Addis Ababa, Bole Sub City Bole Ayat area. The main objective of the present research work was to characterize the building foundation material and to assess its bearing capacity and settlement potential in the study area. To meet out the objectives of the present study, systematic methodology was followed. Literature review was undertaken to have general background on the subject matter. Besides previous works were reviewed, secondary data was collected from various sources, filed observation and laboratory tests were also conducted. Representative samples were also collected and analyzed. Secondary data on borehole logs, test reports and other documents on site investigations were procured from several companies and organizations. Also, test pit logging, sampling and testing were also undertaken to generate primary data. The secondary data was processed and all relevant parameter data/ information necessary for bearing capacity and settlement analysis was obtained. For building foundation characterization and analysis the study area was divided into 9 sites; Site 1 to Site 9, so that the data can be well managed and systematic analysis can be made. The bearing capacity was estimated through various analytical and semi empirical techniques, based on laboratory test results on soil properties and through in-situ properties by standard penetration test. The overall evaluation of bearing capacity of foundation soils at shallow depths in the study area reveals that ultimate bearing capacity in general increase with depth and with increasing footing dimensions. Through the limited analysis it is also found that the estimated total settlement is not within the limits of allowable settlement. Further, bearing capacity zonation maps are also forwarded through the present study. Finally, based on the results of the present study recommendations are also forwarded. Key words: Building foundation, Bearing capacity, Settlement potential, Standard Penetration test

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Keywords

Building foundation, Bearing capacity, Settlement potential, Standard Penetration test

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