›› 2010, Vol. 31 ›› Issue (2): 387-391.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of undisturbed loess stress-strain relation during CT test

WANG Zhao-yang1, XU Qiang1, NI Wan-kui2   

  1. 1. State key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2. College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
  • Received:2008-09-05 Online:2010-02-10 Published:2010-03-24

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Abstract:

The stress-strain relation of undisturbed loess during triaxial shear test is studied by using real-time computerized tomography(CT) scanning. The curves of loesses Q2 and Q3 are analyzed; and the method how to determine the initial damage stress and strain threshold value is proposed. Based on analyzing the test results, it is pointed out that the loess Q2 will be damaged easily under low confining pressure; and its damage strain threshold value is lower than that of loess Q3. At last, damage variable formula defined by CT values and the relationship of the damage variable, axial strain and deviatoric stress is given.

Key words: undisturbed loess, damage, stress-strain relation

CLC Number: 

  • TU 411
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