Studyon Creep Mechanical Models of Coal and Rock under Different Infiltration Times
Conduct uniaxial compression creep tests on coal and rock under different infiltration times.The experiment shows that coal rock undergoes instantaneous elastic strain at the moment of axial stress loading,followed by attenuation and stable creep.When the loading stress is higher than the long-term strength,it exhibits accelerated creep behavior;By calculating the inflection point through the isochronous stress-strain curve,the long-term strength of coal and rock is determined,which decreases with the increase of infiltration time.Based on the viscoelastic plasticity of coal rock creep,a basic creep model is determined.The Hooke volume considering damage is used to describe the instantaneous elastic strain of coal rock,the fractional order viscous body represents the viscoelastic strain,and the fractional order viscous plastic body reflects the viscoelastic strain.A new improved mechanical model of coal rock creep is constructed.The results indicate that the improved model has a good simulation effect on the creep curve of coal and rock,and can accurately reflect the creep mechanical behavior of coal and rock under different infiltration times.
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