关键词: 非饱和土, 弱膨胀土, 线膨胀率, 新开挖边坡

Abstract: The expansive deformation value play a very important effect in the study of accumulated deformation of the slope. The deformation of newly cut slope is influenced by the co-effect of unload and water content. However, the current specification method considers less water content variation in the measurement of linear expansive ratio, so it cannot simulate the practical condition of water content of newly cut slope. Aiming at a newly cut slope, we design a simulation test that is in accordance with the variation of water content and load, and compare the results from the specification method. The results show that the linear expansive ratio obtained by specification is relatively larger; the shallower the soil is, the more influence on linear expansive ratio by water content and load variation is. It is demonstrated that the effect of water content on the test of linear expansive ratio of newly cut slope should be considered.

Key words: unsaturated soil, weak expansive soil, linear expansive ratio, newly cut slope