关键词: 膨胀土路基, 广义湿度系数, 大气影响深度, 零膨胀率, 处置深度

Abstract: The depth of soil layer which influenced by climate in Hefei is studied by way of climate environmental data and field experiment of water content. It can be found that the calculated depth of the layer according to climate environmental data is smaller than the real value. On this foundation, the determination method of treatment depth for subgrade paved with expansive soil is proposed based on the relationship of swelling pressure and unloaded expansibility. The correlative curve of the expansive pressure and the unloaded expansibility is established by means of swelling pressure test of eighteen representative soils selected from Hefei. It provides reliable references for determining the treatment depth of subgrade. Finally, some suggestions of treatment depth for the different structure positions of subgrade are given.

Key words: expansive soil subgrade, generalized moisture coefficient, climate influenced layer, unloaded expansibility, treatment depth