Identification of specific features in distribution of the stress-and-strain state of a rock mass with variation in the contact stiffness of fault

DOI: https://doi.org/10.30686/1609-9192-2023-S1-110-115

S.V. Dmitriev , I.E. Semenova Mining Institute Kola Science Centre of the Russian Academy of Sciences, Apatity, Russian Federation Russian Mining Industry №1S / 2023 р. 110-115

Abstract: In order to enhance the adequacy of the stress-and-strain modelling results in rock masses, it is necessary to consider not only the strength properties of the host rock mass, but also the shear component. A shear along the structural inhomogeneities in the disturbed rock mass is a relative displacement of blocks of various modules relative to each other. In the finite element analysis of geological structures, it is possible to apply special contact elements to account for the strength parameters of the interface between the blocks. The main purpose of presented research was to estimate the stress field changes of a rock mass, both in the host rock mass and in the fault structure, when introducing the contacting elements in the plane of the given structural inhomogeneity. A number of numerical experiments have been carried out using the created model of the field section in vicinity of the fault structure to assess the effect of introducing the contact elements at the boundary of the structural inhomogeneity with variation of the normal and tangential stiffness. Based on the results of this work, it is possible to identify those model classes in which introduction of the contact elements along the fault contact surface at a particular scale level produces a tangible effect as well as to screen out those cases where using an equivalent fault substitute material would be sufficient.

Keywords: numerical modelling, stress-and-strain state, inhomogeneity, finite element method, contact element, fault structure

For citation: Dmitriev S.V., Semenova I.E. Identification of specific features in distribution of the stress-and-strain state of a rock mass with variation in the contact stiffness of fault. Russian Mining Industry. 2023;(1 Suppl.):110–115. https://doi.org/10.30686/1609-9192-2023-S1-110-115

Article info

Received: 23.02.2023

Revised: 15.03.2023

Accepted: 21.03.2023

Information about the authors

Sergey V. Dmitriev – Research Associate, Sector of Prediction of rock burst hazard of rock deposits, Mining Institute Kola Science Centre of the Russian Academy of Sciences, Apatity, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Inna E. Semenova – Cand. Sci. (Eng.), Head of the Sector of Prediction of rock burst hazard of rock deposits, Mining Institute Kola Science Centre of the Russian Academy of Sciences, Apatity, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

References

1. Kozyrev A.A., Semenova I.E., Shestov A.A. 3D modeling of the stress-and-strain state of the rock mass as a basis for predicting the rock-bump hazard in underground mines of the Apatite JSC. In: Geodynamics and the stressed state of the Earth's subsoil: a collection of scientific papers Novosibirsk: Institute of Mining of the Siberian Branch of the Russian Academy of Sciences; 2008, pp. 272–278. (In Russ.)

2. Kozyrev A.A., Semenova I.E., Shestov A.A. Numerical modeling of the stress-strain state of the rock mass as a basis for predicting the rock-bump hazard at different stages of field development. In: Melnikov N.N. (ed.) Computer technologies in designing and planning of mining operations: Proceedings of the All-Russian Research Conference with international participation, Apatity, September 23–26, 2008. St. Petersburg: Renome; 2009, pp. 251–256.

3. Goodman R.E., Taylor R.L., Brekke T.L. A model for the mechanics of jointed rock. Journal of the Soil Mechanics and Foundation Division Proceedings of the American Society of Civil Engineers. 1968;94(3):637–660. https://doi.org/10.1061/JSFEAQ.0001133

4. Semenova I.E., Dmitriev S.V., Shestov A.A. 2020 3D finite element-based modeling of discontinuities. Gornyi Zhurnal. 2020;(12):35–39. (In Russ.) https://doi.org/10.17580/gzh.2020.12.07

5. Barton N. Rock Quality, Seismic Velocity, Attenuation and Anisotropy. London, UK: CRC Press; 2006. https://doi.org/10.1201/9780203964453

6. Shen B., Barton N. Rock fracturing mechanisms around underground openings. Geomechanics and Engineering. 2018;16(1):35–47. https://doi.org/10.12989/GAE.2018.16.1.035

7. Kostyuchenko V.N., Kocharyan G.G., Pavlov D.V. Strain properties of the inter-block gaps of different sizes. Physical Mesomechanics Journal. 2002;5(5):23–42. (In Russ.) https://doi.org/10.24411/1683-805X-2002-00034

8. Kocharyan G.G. Fault geomechanics. Moscow: GEOS; 2016. 424 p. (In Russ.)

9. Turner M.J., Clough R.W., Martin H.C., Topp L.J. Stiffness and deflection analysis of complex structures. Journal of the Aeronautical Sciences. 1956;23(9):805–823. https://doi.org/10.2514/8.3664

10. Yufin S.A., Lamonina E.V. Analysis of the stress-and-strain state of fractured rocks using numerical methods. Mining Informational and Analytical Bulletin. 2008;(10):268–277. (In Russ.) https://giab-online.ru/files/Data/2008/10/6_YUfin4.pdf

11. Li J. Numerical Simulation of Interfaces in Geomaterials: Development of a New Zero-thickness Interface Element. University of Delaware; 1993. 154 p.

12. Shahverdiloo M.R., Zare S. Studying the normal stress influential factor on rock joint stiffness using CNL direct shear test. Arabian Journal of Geosciences. 2021;14(20):2082. https://doi.org/10.1007/s12517-021-08449-6