营口地区软土的流变模型

The rheological models of soft soils in Yingkou district

根据室内三轴剪切流变试验的结果,研究了营口地区淤泥质软土的流变特性.结果表明,该类软土具有明显的变形时效性及其在不同应力水平下的蠕变特性.通过分析蠕变曲线的规律,选择了西原模型和双阀值模型这两种理论模型来描述软土的流变特性.由非线性拟合的结果得出其扩展的理论模型精度更高及双阀值模型比西原模型精度更高的结论,同时还指出软土的非线性特性对参数拟合的影响.最后,选择了Singh Mitchell模型及其修正模型对软土进行经验拟合,并达到了良好的精度.

Based on the data of rheological test,the rheological properties of soft soils in Yingkou district are studied.The obvious time-characteristics of the soft soils as well as its rheological properties under different stress levels are demonstrated.Two styles of component models are chosen to describe the creep characteristics according to the analyses of the laws of the creep curves.Two conclusions were drawn from the results of nonlinear simulations that developed component models can describe the full creep procedures better than primitive ones and the double-limits model was more precise than XiYuan models.In addition,the effects of the nonlinear properties of soft soils in parameters simulations are interpreted.At last,two experienced models——the Singh-Mitchell model and its amended model were brought forward to simulate the creep curves.In comparison with experimental curves,the forecast curves were satisfied.