›› 2014, Vol. 35 ›› Issue (S1): 141-148.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Laboratory model test on fissure development and moisture-heat behavior of expansive soil under action of continuous evaporation

LI Xiong-wei1，WANG Ai-jun1，WANG Yong2，WANG Ji-guo3，LI Shu-jin1   

  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:2013-10-30 Online:2014-06-10 Published:2014-06-20

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Abstract: Talking the strong expansive soil of Guangxi as research object. 30 days evaporation experiment was respectively carried out for expansive soil with on without vegetation cover and under plastic sheeting cover, to explore the influence of continuous evaporation process on moisture-heat behavior and fissures development. The results show that without vegetation cover, the surface soil amount and rate of volumetric water content changes respectively are 7.38% and 0.17%/d; with vegetation cover, which are respectively 5.29% and 0.07%/d; apparently under vegetation cover, whose dehydration content and drying rate were less than that of without vegetation cover. For plastic sheeting cover, expansive soil evaporation is curbed and no water loss. Without no vegetation and plastic sheeting cover, the average temperature changes of expansive soil are 7.36 ℃，9.72 ℃ respectively, which is 5-8 ℃ higher than that with vegetation cover 2.03℃; obviously, the vegetation cover reduces expansive soil temperature variation. Without vegetation cover, expansive soil fissure depth is up to 32 cm, which is closer to 28 cm influence depth of moisture-heat. Under vegetation and plastic sheeting cover, no apparent fissure carried out in the plane and vertical; vegetation cover and the state of evaporation curbed can prevent expansive soil fissure developing.

Key words: expansive soil, fissure, moisture-heart, atmosphere action, vegetation

CLC Number: 

  • TU443
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