原状黄土土水特征曲线拟合方法研究

为了探索原状黄土土水特征曲线的拟合方法,采用已有的经典拟合方法对宝鸡、岐山和杨凌3个地区的原状黄土的土水特征曲线(SWCC)进行了拟合,并和室内基质吸力压力板减湿试验结果进行了对比。结果表明,FredlundXing,Van Genuchten和BrooksCorey三种拟合方法都可以较好地反映原状黄土的SWCC,而van GenuchtenBurdine和van GenuchtenMualem两种方法由于残余含水率和实际差别过大,并不适合描述原状黄土的SWCC。最后建议了一种简单而又适合实际工程采用的SWCC拟合公式,并通过试验验证了其可行性。

Study on soil-water characteristics curve fitting for undisturbed loess soil

In order to explore the fitting approach for SWCC of undisturbed loess, the SWCC of loess soil samples in Baoji, Qishan and Yangling were fitted through 5 conventional fitting methods, and also results of indoor dehumidification experiment of matric suction pressure plate were compared with the fitting data. The results show that Fredlund & Xing, van Genuchten and Brooks&Corey fitting methods can better reflect undisturbed loess SWCC, while van Genuchten&Burdine ( VGB) and van Ge-nuchten &Mualem ( VBM) are not suitable for describing undistributed loess SWCC as their residual moisture contents are differ-ent from practical condition. Finally, a simple and practical engineering SWCC prediction formula was proposed and verified by tests.