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| An experimental study on tbe rheological perturbation effect and a constitutive model of water-rich soft rock |
| YU Yongjiang1,LIU Feng1,2,ZHANG Wei1,ZHANG Guoning1 |
1.School of Mining, Liaoning Technical University, Fuxin 123000 China;
2.China Coal Pingshuo Group Company Limited，Shuozhou 036006，China |
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Abstract Deep water-rich soft rock roadway under dynamic disturbance has the characteristics of large rheological deformation and rapid deformation rate, which is the main reason for the difficulty of roadway support and the creep-induced rock bursts.In order to study the creep failure characteristics and a constitutive model of water-rich soft rock under dynamic disturbance, the stage-loading creep test of soft rock with different moisture content was conducted by a self-developed rock disturbance creep experiment system.The results show that: The deformation of the soft rock increases suddenly when the disturbance is applied, and then the deformation rebounds from different degrees.Finally, the deformation continues developing on this basis.The disturbance deformation rate increases slowly with disturbance energy under less stress level and low moisture content.On the contrary, the perturbation deformation rate increases rapidly with perturbation energy under high stress level and high moisture content, which lead to failure of rock specimens.The constitutive model of rheological perturbation effect of water-rich soft rock was established based on the perturbation state equation of perturbation energy and model parameters were identified.The model fitting curves agree well with the experimental curves, which verified that the model can be described correctly in rich water soft rock creep properties under dynamic disturbance.
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Received: 24 July 2018
Published: 15 June 2019
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