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| EXPERIMENTAL TEST ON CONSTITUTIVE RELATIONSHIP
OF NANJING FROZEN SILTY CLAY CONSIDERING
DUNCAN-CHANG MODEL |
| SUN Guyu，YANG Ping，LIU Guanrong |
| (College of Civil Engineering，Nanjing Forestry University，Nanjing，Jiangsu 210037，China) |
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Abstract Through triaxial shear tests，the shear strength and deformation characteristics of frozen silty clay of Nanjing Metro were mainly focused on. Then，Duncan-Chang model for frozen silty clay was established，considering the coupling of confining pressure and temperature. The results show that the shear strength increases with decrease of temperature. Accordingly，the parameters a and b can be obtained. In addition，the ratio of breaking strength to ultimate strength is acquired with value between 0.77 and 0.91，averaging 0.86. Comparing with the ( )- curve calculated by Duncan-Chang model and that obtained by experiments，it is observed that the two match well，suggesting that the model can reflect strength and deformation characteristics of frozen silty clay under different confining pressures and temperature conditions. The results will provide reference to the artificial freezing method employed in Nanjing Metro.
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Received: 13 August 2013
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2014, Vol. 33 
