砂井地基预压加固的粘弹塑性分析

Visco-Elastic-Plastic Analysis of Preloading withsand Drain

在对软粘士变形特性进行深入分析和已有的粘弹塑性本构模型的基础上，参考室内三轴排水剪、三轴流变试验的成果，改进了软粘土粘弹塑性本构模型的参数确定方法。将这一本构模型引入Ｂｉｏｔ固结理论有限元分析程序，对砂井地基预压加固进行了平面应变有限元分析。计算结果表明，对具有流变特性的软粘土地基在进行变形分析时，采用粘弹塑性本构模型是必要的，本文提出的参数修正方法和计算分析方法是合理的。

ased on deeper analysis of displacement characteristics of soft ground and the existing visco-elastic-plastic constitutive modelThe authors have analysed preloading of sand drain by plane strain FEM,with consideration of result from triaxial drainage shear tests,triaxial rheological tests. In consequence,parameter determination of visco-elastic-plastic constitutive models of soft clay is improved,the model has been introduced into FEM program from Biot consolidation theory.It is indicated that in strainanalysis to soft clay foundation with rheological characteristicxthe visco-elastic-plastic constitutive model is necessary.The suggested method of modification and analysis in this paper is reasonable;