| 英文摘要 |
Both severe ground shaking and ground deformation may cause damage to civil infrastructures. Soil liquefaction is one of the well-known seismic hazards in soft soil regions caused by long-duration cyclic shaking. Therefore, it is helpful to have a quick method to assess the soil liquefaction potential, the associated permanent ground deformation(PGD), and the induced damage and losses in a large study region, immediately after a severe earthquake. Since both the duration and intensity of ground shaking may significantly influence the soil liquefaction potential and severity, it is more realistic to estimate the soil liquefaction potential through a scenario-based approach. This paper first proposes a classification scheme for soil liquefaction susceptibility categories(LSC). The exact definition and the assignment of a LSC at a specific site can be obtained from engineering borehole data at a site. To facilitate the estimation of the soil liquefaction potential and the associated PGD based only on the LSC, semi-empirical formulas have been derived for each LSC, considering the magnitude of the earthquake scenario, the peak ground acceleration, and ground-water depth at the site. Combining the estimates of ground shaking and deformation, the results can be applied to estimate the probable damage to buildings, bridges, and buried pipelines in a large area. Furthermore, in view of the large uncertainty associated with seismic activities and the consequences, the proposed soil liquefaction assessment model may be integrated with a probabilistic seismic source model to study the liquefaction potential in a probabilistic sense. In other words, a hazard curve of liquefaction potential at a specific site or a hazard map of liquefaction corresponding to specific return periods is studied through a scenario simulation approach. |
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