抄録
The saturated ground just under shallow foundations tends not to liquefy due to the overburden pressure from the superstructure. But even in such cases, the structure can settle considerably due to liquefaction of the surrounding ground. Therefore this effect alone cannot be considered as a liquefaction countermeasure. On the other hand, a grid underground wall is widely used as a liquefaction contermeasure because of its shear deformation suppression effect. In this study, these two liquefaction suppression effect (overburden pressure and shear deformation suppression) are combined and tested in a centrifuge test. The tests results confirm that the overburden pressure from shallow foundations effectively suppresses liquefaction. This tendency is dominant when the contact pressure of the foundation is large and thickness of liquefaction layer is thin. Moreover, the grid underground wall effectively reduces the settlement of the shallow foundations.
