The Rigidity Recovery of Post Liquefied Soils

On the performance based design, it is very important to predict the deformation of structures. In order to predict the deformation of structures, we have to know how much the ground will move or how much earth pressure will work. Especially, a prediction of behavior of a liquefied ground beneath structures is very important because of its large deformation. Many studies on the behavior of liquefied soil were conducted to evaluate the characteristics of soil in the post liquefaction stage. There are two kinds of idea about the characteristics of post liquefied soil. Some papers demonstrate that the liquefied soil behaves like a solid which has very low shear strength. In the other idea the soil is considered as a liquid. At the first stage of deformation, the soil behaves like a very weak solid or a liquid. However, it recovers the shear strength after the large deformation due to dilatancy caused by the deformation. This study aims to clarify the effects of some factors on the rigidity recovery of post liquefied soil. This paper describes results of a series of torsional hollow cylinder shearing tests to evaluate the shear stress — strain relationship of liquefied soil. Effects of fine particles content, relative density, overburden pressure, and maximum shear strain during the shaking are discussed.