›› 2006, Vol. 27 ›› Issue (5): 730-734.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study on SWCC of unsaturated expansive soil

LI Zhi-qing1, HU Rui-lin1, WANG Li-chao2, LI Zhi-xiang3   

  1. 1.Key laboratory of Engineering Geomechanics, Chinese Academy of Sciences, Beijing 100029, China; 2.China Institute for Geo-Environmental Monitoring, Beijing 100081, China; 3.The Forth Survey &Design Institute of China Railway, Wuhan 430063, China
  • Received:2004-08-16 Online:2006-05-10 Published:2013-11-05

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Abstract: It has great important application value to study the relations between suction and moisture of unsaturated soil for its deformation and intensity. With the unsaturated triaxial equipment for expansive soil test, we analyze systematicially the multi-factors such as the components of mineral, the structure of hole, the stress state of soil and the stress history etc., which affect soil-water characteristic curve (SWCC). Especially the components of mineral and the structure of hole are primary influential factors. Based on the measurement of matric suction indoor and outdoor, we think over synthetically the effect of multi-factors to fit and compare SWCC, also we build the model of power function. And according to SWCC, the otherness is obvious in the curve of dry-damp circulation indoor and not obvious in the curve outdoor, which is similar to the welter curve indoor. The permeability and shear strength etc. of unsaturated expansive soil can be calculated by combining the curve outdoor with welter curve, which has great superiority in solving problems of geotechnical mechanics.

Key words: unsaturated expansive soil, SWCC, matric suction, moisture, dry-damp circulation

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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