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Volume 34 Issue 2
Apr 2020
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Chinese Journal of High Pressure Physics  > 2020  >  34(2): 024202.
LUO Ji’an, LIU Fengmao, LIU Zhixi, MA Leiming, CHEN Yekai, LI Xinwei. Study and Correction of Cyclic Loading-Unloading Constitutive Model of Rock Based on Octahedral Theory[J]. Chinese Journal of High Pressure Physics, 2020, 34(2): 024202. doi: 10.11858/gywlxb.20190797
Citation: LUO Ji’an, LIU Fengmao, LIU Zhixi, MA Leiming, CHEN Yekai, LI Xinwei. Study and Correction of Cyclic Loading-Unloading Constitutive Model of Rock Based on Octahedral Theory[J]. Chinese Journal of High Pressure Physics, 2020, 34(2): 024202. doi: 10.11858/gywlxb.20190797
shu

Study and Correction of Cyclic Loading-Unloading Constitutive Model of Rock Based on Octahedral Theory

doi: 10.11858/gywlxb.20190797
  • 1.

    School of Mechanics and Optoelectronics Physics, Anhui University of Science and Technology, Huainan 232001, Anhui, China

  • 2.

    School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China

  • Received Date: 26 Jun 2019
  • Rev Recd Date: 10 Jul 2019
    Abstract
  • Exploring the stress and failure characteristics of rock is the key to study the safety of rock underground engineering, thus many scholars expect to make breakthrough in the study of rock constitutive model. In this paper, a constitutive model is proposed to describe the rock under cyclic loading and unloading. Firstly, it is assumed that the micro-unit strength of rock obeys Octahedral shear stress theory and the micro-unit failure of rock obeys Weibull probability formula, and the damage variables in rock constitution and the damage factors contained in micro-unit strength of rock expression are transformed into the constitutive equation. Then the parameters such as stress, strain and others representing the damage constitutive model of rock under loading and unloading can be obtained and are used to express the micro-unit strength and damage variables. Substituting the micro-unit strength and damage variables into the proposed rock constitutive model, a function expression can be carried out by an equation transformation. Through the comparison and analysis of the fitting data with the experimental results, the modified fitting parameters are acquired, and can be substituted into the function to revise the damage constitutive model. Finally, the necessary sensitivity analysis of the fitting parameters is implemented to obtain the practical physical significance of each fitting parameter.

     

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