关键词: 收缩试验, 上覆荷载, 干密度, 干湿循环, 收缩性

Abstract: Shrinkage is a very important feature of expansive soil and it has a very important impact on subgrade disaster prevention and slope protection project. So far, many scholars have studied this subject and reached a lot of meaningful achievements. Based on the existing VSC model, we propose a shrinkage test fitting model for expansive soils of different initial states. We carry out fitting analysis for shrinkage tests of three practical projects by the model, and the fitting results are consistent with measured data, which verifies the applicability of the model. The model has four parameters of a,b,m and n. It shows that a preferable fitting result can be obtained even b is fixed at 0.02, and the parameters of a, m, n are related to the initial states of the soil. Based on these characters, the model is feasible to be applied in practical projects.

Key words: shrinkage test, overburden load, dry density, dry-wet cycle, shrinkage characteristic