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土—水特征曲线是非饱和土力学研究的重要曲线,其拟合参数对于分析非饱和土的各种性质具有重要意义。基于滤纸法试验,测定了庆阳非饱和黄土土—水特征。以Gardner模型为基础,采用计算机语言MATLAB中的Lsqcurvefit、Nlinfit、Fminunc函数对试验结果进行拟合,同时对基质吸力与土体微观平面孔隙率及体积含水率间关系进行综合研究,结果表明:Nlinfit函数拟合效果较好,参数相近,曲线整体形状符合土水特征曲线(SWCC)的特征,且Nlinfit函数拟合的SWCC误差小于10%,具有较好的精度和稳定性。
The soil-water characteristic curve is an important curve of unsaturated soil mechanics. The fitting parameters are of great significance to the analysis of various properties of unsaturated soils. Based on the filter paper test, the characteristics of soil-water in Qingyang unsaturated loess were determined. Based on the Gardner model, Lsqcurvefit, Nlinfit and Fminunc functions in computer language MATLAB were used to fit the experimental results. The relationship between matrix suction and soil micro-plane porosity and volumetric water content was also studied. The results showed that Nlinfit The fitting function is better and the parameters are similar. The overall shape of the curve conforms to the characteristics of soil water characteristic curve (SWCC). The SWCC error fitted by Nlinfit function is less than 10%, which shows good accuracy and stability.