›› 2010, Vol. 31 ›› Issue (9): 2799-2804.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

True triaxial test on clay mixed with gravel under complex stress state

ZHANG Kun-yong 1, 2，ZHU Jun-gao 1,2，WU Xiao-ming3，LI Yong-hong4   

  1. 1. Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Daduhe Hydropower Development Co., Ltd., Chengdu 610016, China; 4. Chengdu Hydroelectric Investigation and Design Institute, Chengdu 610072, China
  • Received:2009-01-12 Online:2010-09-10 Published:2010-09-16

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Abstract:

A new kind of true triaxial apparatus is introduced. To simulate the loading process of core wall element under the dam construction process, true triaxial tests on clay mixed with gravel soil were carried out under complex stress state, which can simulate the practical stress path to some extent. It was found that even for single axial load applied from the major principal stress direction, because of the influence of initial complex stress state, the stress induced anisotropy effects are remarkable. There are different relationships between stress and strain in different principal stresses directions. Based on the testing results, it is suggested that when carrying out the numerical analysis of dam, the stress induced anisotropy should be taken into consideration, so as to reasonably describe the practical behaviors of the core and the whole dam body under three dimensional complex stress states.

Key words: complex stress state, true triaxial test, anisotropy, clay mixed with gravel

CLC Number: 

  • TU 411.3
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