关键词: 地震, 液化, 场地特征, 标贯击数, 波速

Abstract:

Liquefaction data from five major earthquakes, i.e. Kobe, Tonghai, Tangshan, Chichi and Haicheng earthquakes, are collected. The features of liquefied sites are comparatively analyzed to inspect the difference and link. The analytical results show the depths of liquefied layers and the groundwater tables in liquefied sites are obviously different. The depths of liquefied layers mainly are 0-2 m, 2-6 m, 4-6 m and 2-8 m and the groundwater tables mainly are 0-1 m, 1-2 m, 1-3 m and 1-3 m in Tonghai, Tangshan, Kobe and ChiChi earthquakes respectively. The depths of liquefied layers are located from 0 m to 20 m while the groundwater tables are from 0 m to 9 m in ChiChi earthquake, which are the largest ranges. The numbers of standard penetration test (SPT) counts from the earthquakes are similar and mostly are 5-15 counts; but the numbers in ChiChi earthquake vary the most significant with a maximum value more than 30. The average shear wave velocities of the liquefied layers in the earthquakes are considerably diverse. The shear wave velocities are less than 150 m/s in Haicheng earthquake but mainly concentrated in 150-200 m/s in Kobe earthquake. The shear wave velocities in Chichi earthquake mainly are 150-250m/s with an average value of 200 m/s. Sites with shear wave velocities more than 250 m/s liquefied, which disputes previous acquaintance that sites with shear wave velocities more than 210 m/s cannot liquefy.

Key words:

margin: 0cm 0cm 0pt, layout-grid-mode: both, earthquake')">text-align: justify">earthquake, liquefaction, site features, SPT blow count, wave velocity