Effect of Improving Soil as a Countermeasure for Liquefaction

Abstract eng:
Liquefaction causes soil failures and therefore damages to structures. Liquefaction prevention is usually done by estimating the liquefaction susceptibility and then reducing or preventing damage by evaluating its effects. Prevention of liquefaction methods are based usually on improving the soil properties like the density. In this paper, the effect of improving soil properties especially its density as a countermeasure for liquefaction is evaluated. For this purpose, some liquefiable soil profiles which belong to the city of Adapazarı were analyzed using the strong motion data from 1999 Kocaeli Earthquake and its aftershock on September 13th by employing the Equivalent-linear Earthquake site Response Analyses (EERA) program. Soil profiles were analyzed initially in their natural conditions and then analyzed as if improvement was done. According to the analysis results, before and after soil improvement, changes in acceleration, shear stress-strain and response spectra are compared. The analysis results are evaluated and the effectiveness of densification is discussed.

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