地震作用下坝基土体液化判别及动

天津某水库坝基地面以下15m深度范围内的粉土及粉砂层属于容易发生液化的土层，直接威胁大坝的整体稳定。本文采用现场标贯试验（SPT）和室内动三轴试验对水库坝基中的粉土、粉砂层进行了液化判别，并对判别结果进行了对比分析；同时在液化判别的基础上利用有效应力动力分析方法对坝基土体进行了考虑渗流和不考虑渗流的地震液化的非线性动力有限元分析，并将液化的判别结果与现场标贯试验、室内动三轴试验的判别结果进行对比，从中得出一些有益的结论可供类似工程参考。

Liquefaction Evaluation and Dynamic FEM Analysis of Dam Foundation Under Earthquake

Silt and silty sand layers within a depth of 15m under the dam foundation can be easily liquefied when earthquake happens,which directly threaten the stability of the dam.In this paper,the liquefaction evaluation of silt and silty sand was made according to the results of the standard penetration tests(SPT) in-situ and dynamic tri-axial tests indoor;the results of them were also compared.At the same time,on the basis of liquefaction evaluation,the non-linear dynamic FEM analysis of dam foundation using effective stress method was performed with or without taking seepage effect into account.The results of liquefaction evaluation were compared with those of the dynamic tri-axial tests indoor and in-situ.Some useful conclusions were provided as references for similar projects.