Abstract According to the characters of stress-strain curves of soft rock and concrete under impact load,and combining the features of damage body and viscous body,a damage viscoelastic dynamic constitutive model was established. The damage viscoelastic dynamic constitutive model,which was based on the Zhu-Wang-Tang model,was developed by using damage body to be instead of elastic unit of Zhu-Wang-Tang model. In order to prove the rationality of damage viscoelastic dynamic constitutive model,constitutive functions are fitted out respectively on the basis of the experimental data in split Hopkinson pressure bar(SHPB) experimental system. There is a good consistence between the fitting stress-strain curves and the experimental stress-strain curves. Consequently,it can offer reference for further research on dynamic constitutive model of soft rock and concrete and engineering application in underground engineering.
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Received: 16 October 2012
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