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| The EXPERIMENTAL RESEARCH ON CONSTITUTIVE RELATIONSHIP OF FROZEN SILTY CLAY BASING ON THE DUNCAN-ZHANG MODEL |
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Abstract Abstract In order to research the strength and deformation characteristics of artificial freezing frozen silty clay, the soil samples which carried from the construction of connecting passages in DK11+395 of Shenyang subway are taken as the research sample. The strength and deformation characteristics of frozen silty clay are studied through triaxial shear test for frozen soil under different confining pressures, different temperatures and different initial moisture contents. The results indicate that confining pressures, temperatures and initial moisture contents are the most important influence factors for the strength and deformation characteristics. The deviatoric stress versus strain curves of frozen silty clay is hardening. The failure strength (σf) and elasticity modulus (Et) are increasing with confining pressures (σ3c) and initial moisture contents (ω), but decreasing with the temperatures (T). The value of deviator stress ratios are between 0.79~0.96. The Duncan-Chang Model which considered the confining pressures, temperatures and initial moisture contents are established based on the triaxial shear test data. The regress equations between the model’s parameter a, b and σ3c，T and ω are built by using the regression analysis. The calculated deviatoric stress versus strain curves which obtained from the model and the contrast tests are compared. The comparison results show that the calculated results fit well with the test results. The results also show that the model which has been established is efficacious. It can reflect the strength and deformation characteristics of frozen silty clay in different confining pressures, different temperatures and different initial moisture contents. The research results provide a reference to the study of the deformation and strength properties of frozen silty clay and the guidance for the artificial freezing construction. It has not only important theory value, but also has important application value of engineering.
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Received: 01 April 2013
Published: 28 June 2014
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2014, Vol. 35 
