Abstract
A soil structure such as embankment or a surface ground shakes and is deformed due to an earthquake force. As a result, the stiffness of soil decreases by the effect of a strain during the vibration. It is possible to express the effect of the strain by the store of the strain energy that is absorbed into a soil.
The saturated sand liquefies due to the effect of the strain during the strong earthquake motion. Therefore, by using the results of the on-line experiment, we calculated the amounts of the strain energy till the saturated sand liquefied perfectly.
As the results of the analysis, the amounts of the strain energy and its store process required to liquefy perfectly are revealed.
