论文部分内容阅读
为了对膨胀土的收缩性质进行研究,以合肥某工地膨胀土为研究对象,对不同初始干密度的饱和土样进行了收缩试验。研究了线缩率–含水率关系(δ–w)及孔隙比–含水率(e–w)关系,分别对这两种关系进行了曲线拟合,并根据曲线拟合结果求解了膨胀土的缩限、收缩系数、最大线缩率,分析了这些指标及曲线拟合参数与土样初始干密度的关系。结果表明:收缩试验中,质量的测量简单而准确,体积的测量有一定的误差;通过拟合的孔隙比–含水率关系曲线求解的缩限值与通过拟合的线缩率–含水率关系曲线求解的缩限值基本一致;将收缩试验结果与吸力试验相结合,可以得到用体积含水率表示的、考虑体积变化的土水特征曲线。
In order to study the shrinkage properties of expansive soils, the expansive soils of a construction site in Hefei were studied. The shrinkage tests of saturated soils with different initial dry densities were carried out. The relationship between linear shrinkage and water content (δ-w) and porosity-water content (e-w) were studied. Curve fitting was carried out on these two relations respectively. According to the curve fitting results, Shrinkage, shrinkage coefficient, maximum shrinkage rate, and analyzed the relationship between these indexes and curve fitting parameters and the initial dry density of soil samples. The results show that the mass measurement is simple and accurate in the shrinkage test, and the measurement of the volume has a certain error. The relationship between the shrinkage limit value and the linear shrinkage-moisture content ratio fitted by the fitted pore-water ratio curve The shrinkage limit of the curve is basically the same. The shrinkage test and the suction test are combined to get the soil-water characteristic curve which takes the volumetric change as the volumetric water content.