›› 2009, Vol. 30 ›› Issue (7): 2069-2074.

• Geotechnical Engineering • Previous Articles     Next Articles

Field response characteristic test of expansive soil engineering behavior under effect of atmosphere

LI Xiong-wei 1, 2, KONG Ling-wei1, GUO Ai-guo1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Civil Engineering & Architecture, Changzhou Institute of Technology, Changzhou 213002, China
  • Received:2008-10-06 Online:2009-07-10 Published:2011-03-10

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Abstract:

The swelling-shrinking deformation, deformation modulus and permeability of expansive soil are tracked and measured in Nanning, Guangxi considering the effect of atmosphere. The test results are just as follows. Firstly, a low rainfall may lead water content and swelling state to the limit value, and the influence depth of infiltration is finite while raining. Secondly, the deformation modulus is decreased with the increase of water content following the forms of power function. Finally, when the water content is low, the fissure is developed and the permeability is improved greatly; meanwhile, the permeability is also strengthened with the vegetation covered, which is useful to recognize the disastrous mechanism of expansive soil slope.

Key words: expansive soil, swelling-shrinking characteristic, modulus, permeability, vegetation

CLC Number: 

  • TU443
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