线性流变固结模型参数的回归反演分析法

A Regression Analysis Method to Determine Parameters of Linear Rheological Consolidation Models

提出了一种精度高、应用方便的线性流变固结模型参数非线性拟合方法。利用大型数据处理软件ori-gin7.5自定义函数二次开发功能,依据已有流变固结解析理论编制了相应的自定义拟合函数,并对5组萧山软土一维流变固结试验数据进行了回归分析,得到了三元件和四元件流变固结模型的参数,并分析了其变化规律。采用所得参数,利用解析理论计算了试样的沉降和超静孔压,并将理论计算所得沉降和孔压曲线与试验实测曲线进行了对比。结果表明:提出的拟合方法非常有效,拟合所得萧山软土线性流变模型参数有一定的规律,且按所得参数进行理论计算的沉降值与实测值非常吻合。

A nonlinear curve fitting method for linear creep consolidation model parameters is presented. One dimensional consolidation analytical expressions have been used to construct a User Defined Curve Fitting Functions in the software Origin7.5. Regression analyses for one dimensional consolidation tests data of Xiaoshan soft soil have been performed, and parameters of two kinds of linear creep models are derived, and then the variations of the pa- rameters have been analyzed. These parameters have been put to compute the settlement and the pore water pressure of the soil samples using consolidation analytical theory, and the theoretical curves are compared with the tests curves. It is proved that the fitting method is very efficient, and that the creep model parameters of Xiaoshan soft soil obey certain variation rules, and the theoretical settlements are identical with the test ones.