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基于多孔介质中各组分对荷载的分担能力与其自身压缩特性相关联的思路,通过不同孔隙率土体的天然重度、含水率之间的公式转换,提出了由K_n到K_(S_rn)的转换系数法,进而可计算有效应力参数值。通过系列室内侧限压缩试验,研究了压缩模量的变化规律,并利用MATLAB三维拟合得出压缩模量的表达式,该表达式以土体的基本试验指标(天然重度γ、土粒密度ρ_s、含水率w)为自变量,更便于直观表现压缩模量的变化规律。在土体有效应力表达式的基础上,利用不同钻孔点、不同深度粉土层的基本试验数据,得到了黄泛区非饱和粉土有效应力参数χ的值。结果表明:与文献中黄土的χ值相比,当饱和度低于70%时,黄泛区粉土的χ值约为黄土的1.27倍~1.5倍;当饱和度高于85%时,黄泛区粉土与黄土的χ值趋于一致,此时非饱和土的有效应力表达式开始向饱和土的有效应力表达式的形式过渡。
Based on the idea that the load sharing ability of each component in porous media is related to its own compressive property, a formula conversion from K_n to K_ (S_rn) is proposed by the formula conversion between natural and moisture contents of different porosity soils. Coefficient method, and then calculate the effective stress parameter values. Through the series of indoor compression experiments, the variation law of compressive modulus was studied and the expression of compressive modulus was obtained by MATLAB three-dimensional fitting. The expression was based on the basic test index of soil (natural heavy γ, ρ_s, water content w) as independent variables, more easily visualize the variation of compressive modulus. Based on the effective stress expression of soil, the value of effective stress parameter χ of unsaturated silt in the flood plain region was obtained by using the basic experimental data of silt layers with different drilling points and different depths. The results show that when the saturation is less than 70%, the χ value of the silt in the Yellow River is about 1.27 times to 1.5 times that of the loess when compared with the χ value of the loess in the literature. When the saturation is higher than 85%, the yellow The χ values of the silt and loess tend to be consistent, and the effective stress expression of unsaturated soil begins to transition to the form of effective stress expression of saturated soil.