›› 2011, Vol. 32 ›› Issue (11): 3283-3287.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of rate-dependence and hardening-softening characteristics of rock and soil material

WANG Xiao-ping，XIA Xiong   

  1. Institute of Geotechnical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
  • Received:2010-03-15 Online:2011-11-01 Published:2011-11-09

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Abstract: Rock and soil material has strong rate dependence; its complete stress-strain relation belongs to the type of hardening-softening, It is important to describe these two characteristics. Based on the analysis of physical deformation mechanism, considering the structure characteristic, the elasto-viscoplastic model is used. To set up the elasto-viscoplastic model which can describe the structure changes, the variable viscosity coefficients and its evolution equation are applied to the elasto-viscoplastic model. The result of basalt normal triaxial constant rate test is used to test the rationality of the model. The result shows that the model can completely and rationally describe the complete stress-strain relation and its rate dependence, and also the peak strength, residual strength characteristic

Key words: rate dependence, hardening-softening, structure viscosity coefficient, elasto-viscoplastic model, constant strain rate test

CLC Number: 

  • O 345
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