关于砂土液化判别的若干意见

Some comments on methodologies for estimating liquefaction of sandy soils

简要回顾了我国抗震规范中液化判别方法的发展历史，并对我国若干规范中的液化初步判别的条文进行了比较，提出了修改意见；对我国有代表性的几种液化判别方法及基于Ｓｅｅｄ简化方法修正的美国ＮＣＥＥＲ法进行了评述和综合对比，指出了我国现行若干现范中有关液化判别规定方面的错误；此外，还将ＧＢ５００１１—２００１《建筑抗震设计规范》液化判别公式转换为类似于 ＮＣＥＥＲ法的表达式．拓宽了该规范方法的应用范围。最后，结合某长江大桥工程的地基液化判别工作，探讨了深层土液化判别的可能性，结果表明，本文建议的方法是可行的。

The development of the methodology for estimating liquefaction of sandy soils in aseismic design codes in China is reviewed simply over the previous 40 years. and the comprehensive comparison of the items for preliminarily estimating liquefaction potential of sandy soils in some design codes in China is made. Some comments on the revised items of preliminarily estimating liquefaction potential of sandy soils in design code are suggested. Some typical methodologies for estimating liquefaction of sandy soils in design codes in China and the methodology suggested by the workshop sponsored by the National Center for Earthquake Engineering Research(NCEER), America, modified in term of 'Seed's Simplified Procedure are discussed briefly and compared comprehensively, and the errors of the methodologies for estimating liquefaction potential of sandy soils in some design codes in China are pointed out. Besides, the formula for estimating liquefaction of sandy soils in 'Code for seismic design of buildings GB50011-2001 'in China is translated into the expression of another type similar to the NCEER's formula, and the application area of. the original formula is extended. Finally, on the basis of evaluation of liquefaction of ground in a Yangtze River bridge, the methodology for estimating liquefaction of deep-level sandy soils are discussed. The results show that the methodology suggested in this paper is reasonable and practicable.