关键词: 三轴试验, 黄土, 饱和度, B值, 非线性拟合

Abstract: Loess is a special soil because of its large pore structure and vertical joints. The structure of loess is unique, so the structure of loess will be destroyed if the loess is vacuum saturated. The saturation of soil is one of the important steps in the triaxial test. It is known that the saturation degree of specimen closely correlates with the accuracy of the loess mechanical properties. Eight groups of loess samples from Lanzhou and Tianshui, Gansu province, China, were used in the triaxial tests of saturation by GDS triaxial apparatus. A total volume change sensor was used during the saturation of loess samples. Later the total volume change tested by the sensor and the quantity of water in the sample tested by the controller. The saturation degrees of loess samples were calculated by the parameters of loess. After that, the B value would be collected by the computer at the same time. The relationship between the saturation degree and the B value was obtained at the same time. The influence of different methods of saturation on the loess was discussed. The nonlinear fitting on the saturation degree and B value was also conducted so that an empirical formula with exponential form was produced.

Key words: trixial test, loess, degree of saturation, B value, nonlinear fitting