›› 2008, Vol. 29 ›› Issue (6): 1618-1622.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Measurement of deformation of unsaturated compacted soil triaxial specimen based on digital image measurement method

DONG Jian-jun1,2, SHAO Long-tan1, LIU Yong-lu3, YAO Tao1   

  1. 1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China; 2.School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004, China; 3. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
  • Received:2006-12-13 Online:2008-06-10 Published:2013-07-15

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Abstract: A new means of strain measurement of unsaturated soil specimen is introduced in suction-controlled triaxial tests based on digital image measurement method. The digital image measurement method can non-contactually and selectively measure the deformation of whole and local specimen and overcomes some critical shortcomings of using conventional strain measurement method for unsaturated soil specimen in suction-controlled triaxial tests. Meanwhile, the deformation process of the unsaturated soil specimen can also be recorded and analyzed after tests finished. The local deformation of middle section of unsaturated soil specimen that is relatively little influenced by end restraint can be handily and accurately measured by adopting the method. The deformation measurement results of unsaturated compacted soil specimens show that the end restraint has material effect on deformation of specimens and deformation characteristics of middle section is evidently different from the whole specimen that is influenced by end restraint in suction-controlled isotropic loading and triaxial compression tests. So the deformation measurement results of middle section can correspondingly really reflect basic deformation characteristics of unsaturated soil.

Key words: digital image measurement, unsaturated compacted soil, suction, triaxial test, strain

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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