摘要
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。
To study the shrinkage properties of expansive soils, recjarding expansive soils in Hefei as the study object, shrinkage tests on saturated soil samples with different initial dry densities are carried out. The relationship between the linear shrinkage ratio and water content(δ–w)and the relationship between void ratio and water content(e–w) are studied. Based on the results of curve fitting to shrinkage curves, the shrinkage limit, shrinkage coefficient, maximum linear shrinkage of expansive soils are calculated, and the relationship between fitting parameters and initial dry density is analyzed. The results show that the measurement of quality is simple and accurate, but it has some errors to volume in shrinkage tests. The shrinkage limit obtained by using the void ratio and water content curve-fitting method is compared with that obtained by the linear shrinkage ratio and water content curve fitting-method, and they are similar. Combining the shrinkage and suction test results, the soil-water characteristic curve expressed by the volumetric water content and considering the volume change is obtained.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期107-114,共8页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(40972194)
关键词
膨胀土
收缩
干密度
曲线拟合
缩限
expansive soil
shrinkage
dry density
curve fitting
shrinkage limit
