›› 2017, Vol. 38 ›› Issue (5): 1373-1378.doi: 10.16285/j.rsm.2017.05.019

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Nonlinear elastic model of soils considering principal stress direction

DONG Tong1, 2, ZHENG Ying-ren1, 2, KONG Liang3, ZHE Mei4   

  1. 1. Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Logistical Engineering University, Chongqing 401311, China; 2. Chongqing Engineering and Technology Research Center of Geological Hazard Prevention and Treatment, Chongqing 400041, China; 3. School of Sciences, Qingdao Technological University, Qingdao, Shandong 266033, China; 4. School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • Received:2016-07-21 Online:2017-05-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(11572165).

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Abstract: The ratio of shear/normal stress reflects the deformation and failure characteristics of the friction material. By analyzing the shear/normal stress ratio under the change of magnitudes and directions of principal stresses, a nonlinear elastic model of soils considering the direction of principal stress axis is proposed based on the hyperbolic relationship between the shear/normal stress ratio and shear strain component. Considering the initial shear modulus and the strength of soil are closely related to the loading history and direction of stress, a method is given to determine the parameters of the model, and then a stress-strain relationship in the form of component is obtained. The rationality of the model is validated through stress path controlled triaxial test, pure principal stress axis rotation test and shear test with fixed direction of major principal stress. Comparisons of the predictions with the experimental results show that the deformation characteristics of soils under complex stress paths can be well quantified by the proposed nonlinear elastic model.

Key words: nonlinear elastic model, the direction of principal stress, shear deformation, strength

CLC Number: 

  • TU 473.1

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