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Uniform Nonlinear Constitutive Model and Parameters for Clay in Different Consolidation Conditions Based on Regression Method

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  • Tao Cheng
  • Keqin Yan
  • Huazhi Zhang
  • Xianfeng Luo
  • Shengfang Li

Abstract

The nonlinear constitutive relations of clay are investigated considering different initial conditions. Highly compressible clay is selected as the test sample. Two groups of tri-axial compression tests are performed, respectively, after consolidation and isotropic consolidation. On the basis of the framework of model, a uniform nonlinear constitutive model is proposed by fitting the test data. With the average slope of the unloading-reloading curve selected as the unloading modulus, the unloading function is constructed as the loading-unloading criterion. Moreover, a comparison between the experimental stress-strain curves and the results predicted by the constitutive model is made. It is shown that the prediction is reasonable, which can reflect the stress-strain behavior of the soil under the consolidation and isotropic consolidation conditions. The maximum relative error of the two series of curves is not remarkable, less than 6%.

Suggested Citation

  • Tao Cheng & Keqin Yan & Huazhi Zhang & Xianfeng Luo & Shengfang Li, 2014. "Uniform Nonlinear Constitutive Model and Parameters for Clay in Different Consolidation Conditions Based on Regression Method," Mathematical Problems in Engineering, Hindawi, vol. 2014, pages 1-8, April.
  • Handle: RePEc:hin:jnlmpe:804586
    DOI: 10.1155/2014/804586
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