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Volume 37 Issue 5
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SHI Wei-cheng, ZHU Jun-gao, DAI Guo-zhong, LU Xi. True triaxial tests on influence of spherical and deviatoric stresses on deformation of coarse-grained soil[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 776-783. DOI: 10.11779/CJGE201505002
Citation: SHI Wei-cheng, ZHU Jun-gao, DAI Guo-zhong, LU Xi. True triaxial tests on influence of spherical and deviatoric stresses on deformation of coarse-grained soil[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 776-783. DOI: 10.11779/CJGE201505002
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True triaxial tests on influence of spherical and deviatoric stresses on deformation of coarse-grained soil

  • 1. Changzhou Key Lab of Construction Engineering Structure and Material Properties, Changzhou Institute of Technology, Changzhou 213002, China; 2. Key Laboratory of Hydraulic and Waterway Engineering of Chinese Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China; 3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 4. School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China

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  • Received Date: June 14, 2014
  • Published Date: May 19, 2015
    Graphical Abstract
    • Abstract
  • In order to study the influence of p, q and θσ on the deformation of coarse-grained soil, several tests in which only one of the three variables changes while the other two keep constant are performed on coarse-grained soil by using the TSW-40 type true triaxial apparatus in Hohai University. The results show that if p decreases with constant q and b, few deviatoric strain but some volumetric dilation will be generated at the preliminary stage. With the decrease of p, the volumetic dilation increases, which causes the increase of deviatoric strain that is smaller than the volumetric strain in absolute value. Later both the volumetric strain and the deviatoric strain will be accelerated until failure. It indicates that the decrease of p induces the volumetric dilation immediately, which loosens the particle structure, and then the deviatoric strain will be generated. If q increases with constant p and b, little volumetric dilation but some deviatoric strain will be produced at the preliminary stage. With the increase of q, the deviatoric strain increases, which causes the increase of the volumetric dilation that is smaller than the deviatoric strain in absolute value. Later both the deviatoric strain and the volumetric strain will be accelerated until failure. It demonstrates that the increase of q induces the deviatoric strain directly which causes particle dislocation, and then the volumetric dilation will be produced. If θσ changes with constant p and q, some but very small unrecoverable volumetric and deviatoric strains will be generated. Two parameters sp (sp =(p/q-p0/q0)/(1/Mf-p0/q0)) and sq (sp=(q/p-q0/p0)/(Mf-q0/p0)) are introduced, in which p0 and q0 are the initial spheric stress and the deviatoric stress respectively, Mf is the stress ratio at failure. The test results show that when p decreases with constant q and b, dεv/dp and 1/(1-sp)1/2-1 are in direct proportion; dεs/dp and -sp[1/(1-sp)1/2-1] are in direct proportion; stress-dilatancy equation is dεv/dεs= -1/sp. When q increases with constant p and b, dεs/dq and 1/(1-sq)1/2-1 are in direct proportion; dεv/dq and -sq[1/(1-sq)1/2-1] are in direct proportion; stress-dilatancy equation is dεv/dεs= -sq. Finally the characteristics of the flexibility matrix of coarse-grained soil are analyzed according to the test results.
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    • References (20)
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