›› 2015, Vol. 36 ›› Issue (2): 423-429.doi: 10.16285/j.rsm.2015.02.017

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influence of grain gradation on undrained mechanical behavior of granular materials

LIU Ying-jing1, 2, 3, LI Gang2, 4, YIN Zhen-yu1, 2, XIA Xiao-he1, WANG Jian-hua1   

  1. 1. Department of Civil Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Research Institute in Civil and Mechanical Engineering, UMR CNRS, 6183, Ecole Centrale Nantes, Nantes 44300, France; 3. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China; 4. CCCC Third Harbor Consultants Co., Ltd., Shanghai 200032, China
  • Received:2013-10-28 Online:2015-02-11 Published:2018-06-13

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Abstract: This paper studies the influence of grain gradation on the undrained mechanical behavior of granular materials. A series of conventional undrained triaxial compression tests is carried out on two different materials (glass balls and Hostun sand), which have high degree of shape self-similarity. For each material, 6 samples with similar relative density and different gradations ( 1.1-20) are prepared, and then the samples are sheared. Test results show that the grain gradation has an obvious impact on the undrained mechanical behavior of granular material: both deviatoric stress level and undrained shear strength of two material samples decreases as the coefficient of uniformity ( ) of the material increases, their variations tend to converge as coefficient of uniformity surpasses 5. Based on the evolution of the value of the second-order work of the granular assembly during undrained triaxial loading, potential instability for the selected granular materials is also analyzed. The results demonstrate a significant influence of the grain gradation on stability: the higher of coefficient of uniformity ( ), the larger of the potential of static liquefaction and the unstabler of materials.

Key words: grain gradation, undrained triaxial test, instability, relative density, granular material

CLC Number: 

  • TU 411
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