不同干密度砾石土的土-水特征曲线规律及拟合分析

Rule and Fitting Analysis of Different Dry Density on Soil-Water Characteristic Curve of Gravelly Clayey Soil

利用SWC-150 Fredlund土-水特征曲线压力仪,对不同干密度的砾石土进行土-水特征试验,探讨不同干密度下土-水特征曲线(SWCC)的变化规律;采用四种不同的拟合方程对试验所得的土-水特征曲线通过最小二乘法进行拟合,获得了拟合参数及残差平方和。通过残差平方和剂曲线形状对比,Fredlund&Xing四参数方程的拟合效果最好。

SWC-150 Fredlund Soil-Water Characteristic Cell is used to test the soil-water characteristic curve （SWCC） of gravelly clayey soils with different densities to discuss the change rule of SWCC. Using least-square method, SWCC is fitted by four fitting tri-parameter model, the parameters and residual sum of squares of the model are discussed. Through the residual sum of squares and curve shapes, the fitting effect of Fredlund＆amp;Xing four parameter equation is best.