Volume 31 Issue 3
Jun.  2025
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TRIMONOVA M，STEFANOV Y，DUBINYA N，et al.，2025. A comprehensive study of the mechanical properties of rock-like materials for inelastic deformation model establishment[J]. Journal of Geomechanics，31（3）：475−490 doi: 10.12090/j.issn.1006-6616.2024094
Citation: TRIMONOVA M，STEFANOV Y，DUBINYA N，et al.，2025. A comprehensive study of the mechanical properties of rock-like materials for inelastic deformation model establishment[J]. Journal of Geomechanics，31（3）：475−490 doi: 10.12090/j.issn.1006-6616.2024094
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A comprehensive study of the mechanical properties of rock-like materials for inelastic deformation model establishment

doi: 10.12090/j.issn.1006-6616.2024094
  • 1.

    Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences, Moscow 119334, Russia

  • 2.

    Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia

  • 3.

    Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, Tomsk 634055, Russia

  • 4.

    Center of Applied Geophysics, Moscow Institute of Physics and Technology, Dolgoprudny 141701, Russia

  • 5.

    Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow 123995, Russia

Funds:  This research is financially supported by the State assignment of the Ministry of Education and Science of the Russian Federation (Grant No. 125012100531-7) and the FNI Project (Grant No. FWZZ-2022-0021).
More Information
  • Corresponding author: 斯特凡诺夫·尤里（1991—），男，博士，岩石力学专业。Email：dubinya.nv@gmail.com
  • Received: 2024-09-04
  • Revised: 2025-04-18
  • Accepted: 2025-04-27
    • Available Online: 2025-05-14
  • Published: 2025-06-28
    Abstract
  •   Objective  The work is devoted to the study of irreversible deformation of artificial samples subjected to a set of standard experiments, with an aim to study their mechanical properties. The principal idea of the study is related to the preparation of an artificial material with an established constitutive behavior model. The existence of such a well-described material provides future opportunities to conduct controllable experiments on various mechanical processes in rock-like material for further development and validation of theoretical models used in rock mechanics.   Methods  A set of artificial samples was prepared for careful assessment through a number of loading tests. Experimental work was carried out to determine the rheological properties under conditions of triaxial compression tests and uniaxial tension. Triaxial loading tests are completed for 9 samples with varying radial stress levels (0–5 MPa). The samples are loaded up to the yield point with control of radial and volumetric strain. The experimental results, which contain the obtained interrelationships between axial and radial stresses and strains, are analyzed using the Drucker-Prager yield surface. Material hardening is taken into account through the non-associated plastic flow law with the cap model. Numerical modeling of sample loading is performed through the finite difference method. Mathematical model parameters are adjusted to minimize the discrepancy between numerical modeling results and experimental data. The design of a series of experimental studies necessary to determine all the parameters of the model has been studied.   Results  It is shown that the formulated mathematical model allows to reliably reproduce the inelastic behavior of the studied material, and it can be used to solve a set of applied problems in continuum mechanics, the problem of numerical simulation of hydraulic fracture growth in an elastoplastic medium in particular. It was found that for the entire range of applied lateral loads (0 – 5 MPa), the elastic limit varied from 2 to 4 MPa, after which the material began to behave plastically. It was also determined that at lateral loads ≥ 3 MPa, compaction began to appear in the material beyond the yield point. Judging by the dependence of volumetric strains under a lateral load equal to 1.4 MPa, compaction should begin to appear even at lateral loads lower than 3 MPa.   Conclusion  Taking the plastic behavior of the material into account is necessary when moving on to modeling the hydraulic fracturing process in such a material, and the resultant plasticity parameters for the model material can be used for numerical modeling of elastoplastic deformation of the rock under consideration, including processes such as hydraulic fracture growth in a poroelastoplastic medium. [ Significance ] The suggested procedure to interpret results of experimental studies can be used for further numerical modeling of mechanical processes in rock masses with inelastic strain accumulation. This opportunity can increase the reliability of geomechanical models used for the optimization of hydrocarbon fields development.

     

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