Volume 37 Issue 7
Jul.  2021
Turn off MathJax
Article Contents
YANG Zhen-wei, JIN Ai-bing, GAO Yong-tao, WANG Kai, SUN Hao. Non-stationary Nishihara model in the particle flow code[J]. Chinese Journal of Engineering, 2015, 37(7): 831-838. DOI: 10.13374/j.issn2095-9389.2015.07.002
Citation: YANG Zhen-wei, JIN Ai-bing, GAO Yong-tao, WANG Kai, SUN Hao. Non-stationary Nishihara model in the particle flow code[J]. Chinese Journal of Engineering, 2015, 37(7): 831-838. DOI: 10.13374/j.issn2095-9389.2015.07.002

Non-stationary Nishihara model in the particle flow code

More Information
  • Received Date: October 27, 2014
  • Available Online: July 09, 2021
  • In order to accurately simulate the whole process of rock creep and explore the generation and development of mircofractures from the meso-level,a visco-elastoplastic Nishihara rheological constitutive model is developed in the two-dimensional particle flow code(PFC2D). Then a non-stationary Nishihara model including two non-stationary elements is put forward in this article. A constitutive equation and a creep equation are derived based on the non-stationary Nishihara model. The user-defined Nishihara constitutive model is called in PFC2D,and a numerical sample whose strength properties are the same as those of a real rock specimen is acquired by parameter testing. Using the data of uniaxial creep tests in laboratory,the non-stationary parameters are back analyzed in Matlab. At last,uniaxial creep tests are simulated using the stationary and non-stationary models,and micro-fractures are monitored.A comparison of these results show that the stationary model can only be used to describe the decay and steady stages,while the nonstationary model is also applicable to the accelerated stage,and thus can simulate the whole process of rock creep. Accelerated creep results from the accelerated development of mirco-fractures and leads to shear failure.

Catalog

    Article Metrics

    Article views (505) PDF downloads (27) Cited by()
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return