关键词: 回弹变形, 固结时间, 固结压力, 卸荷比, 回弹率

Abstract: The study of the rebound deformation effect of soil layer is helpful for the scientific implementation of groundwater recharge,
management of groundwater resources and prediction of land subsidence. In this paper, the influencing factors and deformation
characteristics of soil layer rebound are studied through a large number of indoor compression rebound tests. The experimental results
show that the ultimate rebound of soil layer is affected by soil properties, maximum consolidation pressure, consolidation time and
unloading ratio, etc. The higher the content of clay soil is, the greater the rebound is. For the same kind of soil, the shorter the
consolidation time and the greater the unloading pressure are, the greater the rebound is. When the unloading ratio is less than 0.5, the
consolidation pressure has no obvious influence on the soil layer rebound. With the increase of the unloading ratio, the soil rebound
increases and the influence of the consolidation pressure on the same soil becomes greater. And, when the unloading ratio is greater
than 0.9, the rebound increases rapidly. When the type of soil layer and consolidation pressure are determined, the maximum rebound
rate and consolidation pressure show a nearly linear relationship, which can be used to predict the maximum rebound rate of soil layers.

Key words: rebound deformation, consolidation time, consolidation pressure, unloading ratio, rebound rate