天津永定新河口滩涂地层沙性土的液化判别分析

根据天津永定新河口滩涂地层沙性土分布规律,采用现场标准贯入试验和室内动三轴试验两种方法进行了沙性土的液化判别。两种方法的判别结果基本一致,即在地震基本烈度为Ⅶ度的地震作用下,除第5层的沙性土不发生液化外,其余各层的沙性土均发生局部液化;在基本烈度为Ⅷ度的地震作用下,仅第5层的沙性土发生局部液化,其余各层的沙性土均完全液化;在基本烈度为Ⅸ度的地震作用下,所有地层中的沙性土均完全液化。

Liquefaction Discrimination and Analysis of Stratigraphic Sandy Soil in the Tianjin Yongdingxin River Estuary Area

Based on the distribution regularities of stratigraphic sandy soil in the Tianjin Yongdingxin River estuary area,the in-situ standard penetration test(SPT) method and the indoor dynamic triaxial test method were used to make the sandy soil liquefaction discrimination.The discrimination results made by using the two methods are basically consistent with each other,and it is shown from the discrimination results that under the actions of an earthquake of magnitude 7,the sandy soil in the fifth stratum will not be liquefied,and that in the other strata will partly be liquefied;under the actions of an earthquake of magnitude 8,the sandy soil in the fifth stratum will partly be liquefied,and that in the other strata will totally be liquefied;under the actions of an earthquake of magnitude 9,the sandy soil in all strata will totally be liquefied.