There are two approaches in present engineering practice for evaluating liquefaction potential of sands (1) by "Simplified Procedure", and (2) analysis based upon SPT tests. In the later, the effect of soil properties which have significant influences on the liquefaction potential of sands and cannot be studied in the lab e.g. previous strain history, aging, soil fabric, overconsolidation ratio (OCR) and cementation is included. By comparing the liquefaction resistance of sands by the 2-methods, theeffect of above varibables has been studied on 24 sites with 92 soil profiles of sandy deposits where earthquakes have occurred. It has not been possible to isolate the effect of each of the five variables because of lack of adequate field data.
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