›› 2013, Vol. 34 ›› Issue (10): 2821-2826.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Moisture-heat coupling behavior and evaporation effect of expansive soil in simulated solar

LI Xiong-wei1, WANG Ai-jun1, WANG Yong2, WANG Ji-guo3   

  1. 1. Changzhou Key Laboratory of Structure Engineering and Material Properties, Changzhou Institute of Technology, Changzhou, Jiangsu 213002, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. College of Civil Engineering, Sanjiang University, Nanjing 210012, China
  • Received:2013-04-16 Online:2013-10-09 Published:2013-10-18

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Abstract: Xenon long-arc lamp is used to simulate solar radiation. Deferent radiation intensities are acquired by adjusting lampshade height. Sunshine state is acquired by controlling the illumination time. Single factor controlling condition is achieved by constant temperature and humidity environment. Then, moisture-heat coupling behavior and rainfall-evaporation effect of undisturbed expansive soil sample in solar radiation are studied. When solar radiation and rainfall occur, the moisture migration and temperature variation present different states. With the to-and-fro moisture migration, the shallow soil tends to the fractured and loosened. In the solar radiation, the amplitude of moisture content variation increases, which aggravates the fissure development. To expansive soil, the characteristics of swelling and fissure are inner being, and atmospheric action is incentive. The behavior of expansive soil is changed gradually in the exchange progress of moisture and energy between atmospheric and soil. The simulating device on solar radiation is used to study the moisture-heat coupling behavior and rainfall-evaporation effect of undisturbed expansive soil. And the experience in research could be applied to the study of other soil types. In view of the engineering properties of expansive soil, the quantitative analysis of moisture migration mechanism of expansive soil could be further developed in the influence of solar radiation.

Key words: expansive soil, solar radiation, rainfall, fissure, moisture-heat coupling

CLC Number: 

  • TU 443
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