›› 2015, Vol. 36 ›› Issue (11): 3041-3046.doi: 10.16285/j.rsm.2015.11.001

• Fundamental Theroy and Experimental Research •     Next Articles

Yield criterion of intact structural loess based on integrated structural potential concept

ZHONG Zu-liang1, 2, WANG Sui1, LIU Xin-rong1, 2   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China
  • Received:2015-07-18 Online:2015-11-11 Published:2018-06-14
  • Supported by:

    Project supported by the National Natural Science Foundation (Grant No.51108485), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.20110191120033) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos.106112013CDJZR200001 and CDJZR12200012).

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Abstract: To investigate the destruction characteristics of intact structural loess under loading conditions, triaxial shear tests are conducted on Q2 intact loess. Based on the experimental results, a structural variable parameter m of soil is defined, which can consider the spherical stress, deviatoric stress, matric suction and other factors. By means of method for calculating the structural parameter m based on the experiment, the relationships among shear strength parameters c, and structural parameter m are found out, the curve equations of m with c, are deduced, respectively. By introducing the curve equations into Drucker-Prager (D-P) criterion, a modified yield criterion applicable to Q2 intact loess is established. The modified yield criterion can consider the structural effect of intact Q2 loess and describe the structural characteristics of loess very well. Besides, the yield surface reflecting the impact of structural parameters is drawn. The rationality of the modified yield criterion is verified by comparing the results of the modified yield criterion with those obtained from the triaxial tests.

Key words: Q2 intact loess, structural parameter, yield criterion, yield surface, constitutive model

CLC Number: 

  • TU 444
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