Experimental study on the uplift deformation of underground structures induced by soil liquefaction

ABSTRACT

Earthquake-induced soil liquefaction causes uplift deformation of lifeline facilities buried in saturated sand layers. This paper presents results of shaking table tests carried out to evaluate the uplift deformation of an underground structure with a rectangular section buried in liquefiable layers. In these tests, the thickness of a liquefiable layer below an underground structure and the size of a structure section are varied. The excess pore water pressures and the accelerations in liquefied ground models are measured. Furthermore, the deformation of liquefied sand layers surrounding the underground structure model is observed.(AU)