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针对场地中存在软弱土层的多种情况,对中、欧场地划分的差异进行比较。通过对一般场地、20 m深度范围内含软弱夹层场地、20 m深度以下含软弱土层场地的剪切波速的计算,依据中国设计规范GB50011—2001、欧洲设计规范Eurocode 8分别进行场地划分。通过比较分析发现,Eurocode 8的场地分类对20 m深度范围内软弱夹层厚度的反应比GB 50011—2001更敏感,对20 m深度以下软弱土层厚度的考虑比GB 50011—2001更细致,建议中国抗震规范应进一步考虑软弱土层的影响,且将计算深度由20 m进一步向下延伸。
In view of the various situations of the existence of weak soil in the site, the differences in the division of sites in China and Europe are compared. Based on the calculation of the shear wave velocity in soft ground with 20 m depth and the depth of 20 m under the depth of 20 m in general site, the site is divided according to Chinese design code GB50011-2001 and European design code Eurocode 8 respectively. The comparative analysis shows that the site classification of Eurocode 8 is more sensitive to the thickness of weak interlayer in the depth range of 20 m than that of GB 50011-2001, and the consideration of the thickness of soft soil layer below 20 m is more detailed than that of GB 50011-2001. It is suggested that China The seismic code should further consider the influence of soft soil and extend the calculated depth further downwards from 20 m.