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  • ISSN 1005-2518 
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Mining Technology and Mine Management

Study on Creep Characteristics and Nonlinear Creep Model of Argillaceous Siltstone

  • Ziyang ZHANG ,
  • Ping CAO ,
  • Zhizhen LIU ,
  • Feng XIAO
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  • School of Resource and Safety Engineering,Central South University,Changsha 410083,Hunan,China

Received date: 2021-10-05

  Revised date: 2022-01-11

  Online published: 2022-09-14

Abstract

The stability and rock long-term strength of underground rock mass engineering are closely related to the rock creep characteristics.With the deepening of resource exploitation,there are many mining rock mass large deformation and strong rheology problems.Therefore,the research of rock creep,especially the creep model under high stress condition,has great engineering significance and research value. Creep tests on moderately weathered argillous siltstone under graded uniaxial loading was carried out.The rock samples were machined into cylinders with dimensions of ?50 mm×100 mm.The stress loading level was 6~20 MPa,the stress increment was determined to be 2 MPa for each stage,and the stress remained constant for 72 h for each stage.The research shows that most of the creep deformation of moderately weathered argillaceous siltstone occurs at the moment of loading.When the creep stress is less than 12 MPa,the rock creep shows decelerating creep phase and even creep phase.When the creep stress is greater than 14 MPa,the rock creep shows decelerating creep phase,even creep phase and accelerating creep phase.The rock long-term strength obtained by using the given creep rate threshold method is 14.3 MPa.In order to describe the nonlinear creep characteristics of rock,a nonlinear viscoplastic element related to time and stress level was introduced.By connecting the nonlinear viscoplastic with a generalized Kelvin component and a viscous component with a switch,an improved nonlinear viscoelastic-plastic creep model was obtained,and the constitutive equation and creep equation of the improved viscoelastic-plastic creep model were given.The Levenberg-Marquardt nonlinear least square method of Origin platform was used to invert the creep model mechanical parameters.By comparing the generalized Kelvin creep model,Burgers creep model,improved viscoelastic-plastic creep model with the test results,obtain the applicable characteristic of each model.The generalized Kelvin creep model is suitable for describing the rock instantaneous deformation and decelerating creep phase at low stress level,and the Burgers creep model can describe the rock instantaneous deformation,decelerating creep and even creep phase very well.It is concluded that the improved viscoelastic-plastic creep model is suitable for middle-weathered argillaceous siltstone,which explains the nonlinear creep mechanical properties of mudstone formation well.The research results provide important guidance for further revealing the rock rheological properties and building rock creep model.

Cite this article

Ziyang ZHANG , Ping CAO , Zhizhen LIU , Feng XIAO . Study on Creep Characteristics and Nonlinear Creep Model of Argillaceous Siltstone[J]. Gold Science and Technology, 2022 , 30(3) : 449 -459 . DOI: 10.11872/j.issn.1005-2518.2022.03.142

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