【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。更多还原

【Abstract】 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.更多还原