利用MATLAB拟合压实黄土土水特征曲线的研究  

Study of Fitting Soil-water Characteristic Curves for Compacted Loess by MATLAB

作　　者：许淑珍[1] 白晓红[1,2] 马富丽[1] 

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024 [2]黄土地区公路建设与养护技术交通行业重点实验室,太原030006

出　　处：《太原理工大学学报》2015年第1期81-84,共4页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目:压实黄土的工程力学特性及微观结构研究(51178287);黄土地区公路建设与养护技术交通行业重点实验室开放题(KLTLR-Y12-1);山西省自然科学基金资助项目(2010011029)

摘　　要：为了找到准确且简便的拟合压实黄土的SWCC的模型与方法,利用压实黄土入渗试验得到的体积含水率与基质吸力的数据,选用MATLAB的lsqcurvefit,nlinfit和fminunc三种函数为拟合方法,分别拟合了适用性较广的van-Genuchten模型和Gardner模型的土水特征曲线,并进行了拟合比较。结果表明,在本课题研究范围内,利用fminunc函数采用Gardner模型拟合压实黄土SWCC效果最好;平行试验数据的验证结果表明误差小于10%。利用MATLAB的fminunc函数通过Gardner模型拟合压实黄土土水特征曲线是一个既方便又准确的方法。Three functions in MATLAB, i. e. lsqcurvefit, nlinfit and fminunc, were used to find a convenient and accurate way to fit soil water charactieristic curve（SWCC） of compacted loess,by using van Genuchten model and Gardner model separately. The fitting data of volumetric water content and matrix suction were obtained by one dimensional infiltration test of compacted loess. The analysis on fitting effects shows that the fitting result of Gardner model by fminunc function is the best among the methods used in this study. Finally,the data from a parallel test were used to verify the fitting formulae. The er rors between calculated and measured data are less than 10% ,which further verifies that Gardner model fitting SWCC of compacted loess by using fminunc of MATLAB is convenient,stable and accurate.

关 键 词：压实黄土 土水特征曲线 MATLAB 拟合 

分 类 号：TU441[建筑科学—岩土工程]