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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第12期    总第256期    2015年12月

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文章编号:1672-7207(2015)12-4657-07
路基土水分扩散和冷凝迁移的室内模拟试验
王桂尧,肖侃,黄弈茗

(长沙理工大学土木与建筑学院,湖南长沙,410114)

摘 要: 为研究水分扩散和冷凝迁移引起的路基软化机理及影响因素,设计制作模拟路基竖向水分冷凝迁移和水平方向水分扩散迁移的试验装置。首先,模拟竖向温差条件,通过室内试验研究不同压实度路基土在温度梯度作用下的竖向水分冷凝迁移高度和迁移速率变化规律;然后,模拟晴雨交替和连续降雨条件,对不同晴雨交替循环、不同压实度和不同边坡坡度路基土的水分扩散迁移变化进行试验研究,得到了晴雨交替与连续降雨、不同土样压实度以及边坡坡度对路基土水分扩散迁移的影响规律。研究结果表明:路基土的压实度、路基边坡坡度以及晴雨交替循环等因素会对路基边坡的水分扩散迁移速率及迁移范围产生显著影响。路基土的水分扩散迁移是引发高填方路基含水率升高及路基软化的主要原因。

 

关键字: 水分扩散;冷凝迁移;路基软化;连续降雨;晴雨交替

Simulation of moisture diffusion andcondensate migration in subgrade soil
WANG Guiyao, XIAO Kan, HUANG Yiming

School of Civil and Architecture Engineering, Changsha University of Science & Technology, Changsha 410114, China

Abstract:In order to research the subgrade softening mechanism and influence factors caused by moisture diffusion and condensate migration, a series of test devices were designed and produced to simulate subgrade vertical moisture condensation migration and the horizontal diffusion migration. With different compactions of subgrade soils, the change laws of vertical moisture condensation migration height and velocity under different temperature gradients were first studied. Then, the experiments of water diffusion and migration under different alternate rain and sunshine conditions were performed. The compactions of subgrade soils and slope gradients were studied by simulating alternate rain and sunshine or continuous rainfall conditions, and the influence laws of the affection by alternate rain and sunshine condition, different compaction degrees and different slope gradients were obtained. The results show that the changes of the compaction degree and slope gradient or the alternating cycle of rain and sunshine conditions may influence the moisture migration distance and the moisture content in subgrade slope significantly. The moisture diffusion migration in subgrade soil is the main reason for the increase of the water content of the road bed, and it is also the reason for subgrade softening.

 

Key words: moisture diffusion; condensatemigration; subgrade softening; continuous rain; rain or shine alternately

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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