Experimental study of earthquake liquefaction of saturated silt in Tianjin area

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.