Evaluation of Liquefaction Potential on Selected Sites of Hawassa City
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Date
2017-11
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Addis Ababa University
Abstract
A city of high population growth and rapid development founded on top of soft, lacustrine and
alluvial deposit, Hawassa is located in a seismically active area of the country. On top of this, the
fact that it is a lakeside city makes liquefaction a potential hazard that calls for serious
consideration. This thesis evaluates the potential of liquefaction of Hawassa city based on data
acquired after selecting sites in and around the city. Based on these data, the level of hazard with
respect to magnitudes of earthquakes and vulnerable layers thickness with depth is assessed. SPT
and shear-wave velocity based simplified procedure methods are used to evaluate the
liquefaction potential of the study area. This study evaluates liquefaction resistance of the soil
against earthquake induced loads expressed in terms cyclic shear stress of the study area. The
results of the analyses are compared with factor of safeties recommended by ES-EN1998:2015
and BSSC 2000. Majority of the results indicated liquefaction hazard is minimal within the city
with some parts showing marginal signs of liquefaction, leading to the recommendation of site
specific studies for important structures.
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Keywords
Liquefaction, Simplified procedure, Hawassa