科研之友
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摘要
To investigate the dynamic properties(including the dynamic deformation and dynamic strength)of frozen mixed soils subjected to the freeze-thaw cycles,a series of cyclic dynamic experiments were conducted through a cryogenic triaxial apparatus. With the variation of freeze-thaw cycles,a conspicuous influence on the dynamic stress-strain behaviors,volumetric strain curves,hysteresis loop,accumulative axial strain,dynamic resilient modulus,residual deformation,and dynamic strength of frozen mixed soil was analyzed. The results show that:(1)With the increase of the freeze-thaw cycles,the dynamic stress-strain curves and dynamic volumetric strain curves of frozen mixed soil gradually become looser,and the number of failures decreases linearly; (2)The action of freeze-thaw influences the variation of the hysteresis loop,the accumulative axial strain,the dynamic resilient modulus,and the residual deformation of frozen mixed soil,leading an unacceptable deformation;(3)The dynamic resilience modulus and the dynamic strength of frozen mixed soil are reduced with the number of freeze-thaw cycles increased.
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