›› 2007, Vol. 28 ›› Issue (9): 1767-1772.

• Fundamental Theroy and Experimental Research •     Next Articles

On influence factors of suction and deformation of unsaturated soil under evaporation and transpiration effect

CHEN Jian-bin1, KONG Ling-wei1, ZHAO Yan-lin2,3, LÜ Hai-bo2   

  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Research Institute of Preventing and Mitigating Disasters, College of Civil Engineering, Guangxi University, Nanning 530004, China; 3.Department of Civil Engineering, Guilin University of Technology, Guilin 541004, China
  • Received:2006-07-03 Online:2007-09-10 Published:2013-10-15

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Abstract: Based on the equations of coupled heat-moisture anisothermal flow and the behaviors of stress-strain of unsaturated soil, an interaction model of atmosphere-unsaturated soil is established with the boundaries of actual evaporation and vegetation transpiration. The influence of climatic evaporation and vegetation transpiration on the suction and deformation of soil surface are analyzed by the interaction model. It is shown that the major governing factor for the suction and deformation of soil surface is outer climatic condition where solar net radiation and wind velocity are the most contribution, while the internal hydraulic and thermal parameters of soil property play a less role in the estimation of evaporation. With the cover of vegetation, the behavior of suction depends on the leaf area index (LAI), while the magnitude of total evaporation and transpiration determines the deformation of soil surface.

Key words: unsaturated soil, climatic evaporation, vegetation transpiration, suction, deformation, influence factor

CLC Number: 

  • TU 411
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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