2024 年 10 巻 34 号 p. 1279-1284
Rock debris is considered as a highly stable material that can serve as foundation for structures. However, with the recent increase in earthquakes, even landfill grounds comprising rock debris need to be evaluated for potential effects of spatial variations in liquefaction strength. Existing evaluation methods may not be accurate as they often use the lower limit of liquefaction strength to ensure conservatism. In this study, three centrifugal model tests were performed to examine the influence of spatial variations in the physical properties of landfill grounds composed of rock debris, which support a cement-improved embankment. Case A represents a ground model devoid of weak components, whereas Cases B and C include weak elements with a volume ratio of 29.3%. These latter cases were established under varying conditions with respect to the positioning of weak components. It was ascertained that the displacements of the embankment in Cases B and C, where weak components were present, were marginally greater than those in Case A, under the application of analogous seismic motion. Upon comparing the outcomes of Cases B and C, the displacements of the embankment appeared consistent and independent of the configuration of the weak component.
