天津地区饱和粉土地震液化的试验研究  

Experimental study of earthquake liquefaction of saturated silt in Tianjin area

作　　者：周相国[1,2] 邢贵发 苏玉国[3] 

机构地区：[1]天津大学土木工程系,天津300072 [2]天津市地质工程勘察院,天津300191 [3]天津市勘察院,天津300191

出　　处：《岩土力学》2009年第12期3813-3819,共7页Rock and Soil Mechanics

摘　　要：地震液化是导致地基失稳和上部结构受损的直接原因之一。通过对天津地区粉土进行原位取土以及现场原位测试分析,研究了粉土土质特点对液化判别的影响,并在动三轴试验基础上阐述了该区域粉土的动力特性和液化机制。结合原位测试方法比较了现有的地震液化判别方法,指出该区域粉土液化判别应考虑粉土成分特征的影响,并提出孔压达到围压的60%～90%,双幅应变达到4%可作为液化的判别标准。The soil liquefaction caused by earthquake is one of the direct reasons for the foundation invalidation and the structure collapse. Based on in-situ tests, liquefaction estimation of silt with different origins in Tianjin area is studied. Then the dynamic properties and liquefaction mechanism of the silt were illuminated based on dynamic triaxial test. And a comparison between the existed earthquake liquefaction assessment methods was made. combined with the in-situ tests. It is suggested that the influence of silt content should be taken into account in the liquefaction assessment; and the value of pore water pressure is 60%-90% of confining pressure, the value of double amplitude strain is 4%, these values can be used as the indexes of liquefaction evalution.

关 键 词：饱和粉土 地震 液化判别 原位测试 动三轴 

分 类 号：TU435[建筑科学—岩土工程]