砂土液化判别方法可靠性评价

在进行液化评价简化法与规范液化判别方法对比基础上，利用液化概率的对数回归方程，讨论了规范液化判别方法的可靠性。研究结果表明，我国规范液化判别方法其液化概率变动较大，对于烈度 Ⅶ 度，规范法的液化概率在0.17～0.42间，小于简化法概率0.36～0.43，偏保守。对于烈度 Ⅷ 度和 Ⅸ 度近地表场地，规范法的液化概率高达0.65～0.70，远远高于简化法的液化概率，安全裕度不够。对于含粘粒土质液化评价，规范方法的液化概率总体上都较简化法高，特别是烈度Ⅷ度高粘粒含量其液化概率为0.9。

Probability evaluation of liquefaction distinguishing method of sands

The liquefaction distinguishing method of sands based on standard penetration tests is compared with the simplified procedures, and the reliability of the method is discussed. The study indicates the probability of liquefaction of sands evaluated by the method of Chinese Code varies considerably. For the 7°aseismatic zone, the liquefaction probability is between 0.17 and 0.42 and that of simplified procedures is 0.36 to 0.43. The liquefaction probability is up to 0.65 to 0.70, greater than the probability of simplified procedures for 8°and 9°aseismatic zone. Comparison with simplified procedures, the liquefaction distinguish method is unsafe. The liquefaction probability of sands with high fine contents is greater than that of simplified procedures; especially the liquefaction probability is up to 0.9. It is obvious that the safe margin can’t be satisfied. The future study on the term of fine contents of the liquefaction distinguishing equation should be motivated.