饱和砂土地基地震液化深度的试验研究

为探究地下工程场地深层饱和砂土的抗液化强度特征和液化深度，通过动三轴液化试验，选取汉口某轨道交通工程场地埋深超过20 m的饱和砂土为研究对象，分析了深层饱和砂土试样液化特性，获取了试样抗液化强度曲线。分别利用动三轴液化试验和标贯试验击数为指标的液化判别方法，比较分析了深层饱和砂土的地震液化可能性。结果显示本地区饱和砂土地基液化深度在地震烈度Ⅶ度、Ⅷ度时超过20 m。研究成果可为本地区工程实践抗液化处理深度提供参考。

Experimental Study on Seismic Liquefaction Depth of Saturated Sand Foundation

In order to explore the liquefaction-resistance strength characteristics and liquefaction depth of deep saturated sand in underground engineering, liquefaction experimental study by dynamic triaxial was conducted on saturated sandy soil with a buried depth of more than 20 meters in a subway project in Hankou area. The liquefaction characteristics of the deep saturated sandy soil samples were analyzed, and the liquefaction resistance strength curves of the samples were obtained. The seismic liquefaction possibility of deep saturated sandy soil was compared and analyzed based on the liquefaction discrimination methods by dynamic triaxial liquefaction tests and standard penetration tests. The results show that the liquefaction depth of saturated sandy soil foundation in this area can reach more than 20 meters at seismic intensity VII and VIII. The research results can provide reference for the depth of anti-liquefaction treatment in local engineering practice.