基于动三轴试验和土层地震反应对地震液化的判别

以汉口某场地典型钻孔剖面为研究对象，结合动三轴试验成果，采用等效线性化方法考虑土层的非线性特征，利用一维波动方法进行场地土层地震反应分析，探讨场地内埋深10~36 m范围内的各土层在不同地震作用下的液化可能性。结果表明，汉口地区埋深超过20 m的砂土层在Ⅶ度、Ⅷ度地震作用下有液化的可能性；土层液化的可能性随着埋深的增大而减小；输入地震动的频谱特性及平稳段持续时间等因素可影响液化判别结果。该方法可为深层液化判别提供参考。

Liquefaction Evaluation Based on Dynamic Triaxial Test and Soil Seismic Response

Based on the data from a typical drilling profile in Hankou and the results of a dynamic triaxial test, the equivalent linear method is used to describe the nonlinear characteristics of soil layers. An one-dimensional wave method is used in soil seismic response. Then, the possibilities of liquefaction for the soil layers within the depth ranging from 10 to 36 m, under different intensities of earthquakes, are analyzed. The results show that: 1) liquefaction is still possible for the sand layers with a depth more than 20 m when the intensity of earthquake is above Ⅶ or Ⅷ degrees; 2) the possibility of soil liquefaction decreases as the depth increases; 3) the spectral characteristics and stationary duration of the inputted ground motion are possible factors that may affect the results of liquefaction. We suggest the method in this paper can provide reference for liquefaction evaluation in deep soil layers.