广州黄埔地区软土蠕变试验及蠕变模型选择

Creep test and creep model selection for soft soil in Guangzhou Huangpu district

基于室内直剪蠕变试验结果,研究了广州黄埔地区软土的蠕变变形规律,结果表明,该地区软土具有较明显的变形时效性及在不同应力水平下的蠕变特性。通过分析蠕变曲线的规律,分别选用三元件Merchant模型、四元件Burgers模型和五元件广义Kelvin模型来描述软土的蠕变特性。拟合数据显示,五元件广义Kelvin模型的拟合曲线在各级剪应力作用下均能较好地与试验值吻合,能够较好地描述该地区软土的蠕变特性。

Based on the laboratory direct shear creep test results,this paper studies the creep deformationbehavior of soft soil in Guangzhou Huangpu district.The test results show that the soft soil in this area has obvious deformation aging property and creep characteristics under different stress levels.By analyzing the law of creep curves,with selections of three-element Merchant model,four-element Burgers model and five-element generalized Kelvin model,the creep characteristics of soft soil are described respectively.The fitting data show that the fitting curves of the five-element generalized Kelvin model agree well with the experimental values under the shearstress at different levels,and can well describe the creep characteristics of the soft soil in this area.