The methodology of the complex analysis of strains and stresses for finite-element modelling of thrusting

: 116-127
Ivan Franko National University of Lviv
Ivan Franko National University of Lviv
Ivan Franko National University of Lviv

The technique of the complex analysis of results of the finite-element 2D-modelling of thrusting is proposed. It includes visualization of elastic and plastic strains or stress tensor components and its invariants also: hydrostatic pressure, maximal tangential stress and stress ratio. The trajectories of principle stresses and lines of sliding are constructed for mapping of the compound stress state structure. We use Byerlee’s criterion for determination of the possible fracturing zones. If kinematic type and surface orientation of the main fault in this fracturing zone is determined (reverse fault, in our case) then it is possible to predict the evolution of the model. The modelling results of sedimentary rocks compression on the rigid basement are analyzed taking into account friction forces.

1. Gintov O.B. Polevaya tektonofizika i ee primenenie pri izuchenii deformatsiy zemnoy koryi. – Kiev: Feniks, 2005. – 572 s.

2. Tyorkot D., Shubert Dzh. Geodinamika: Geologicheskie prilozheniya fiziki sploshnyih sred. Ch. 2: Per. s angl. – M.: Mir, 1985. – 360 s.

3. Ramsay J.G., Lisle R.G. The techniques of modern structural geology. Vol. 3. Applications of continuum mechanics in structural geology. – Elsevier, 2000. – P. 701–1061.

4. Furman V., Khomiak L., Khomiak M. Chyslove modeliuvannia faktora tertia kovzannia v protsesakh nasuvoutvorennia // Heodynamika – 2007. – 1(6). – S. 85–94.

5. Nemchok M., Schamel S., Gayer R. Thrustbelts. Structural architecture, thermal regime and petroleum systems. – Cambridge University Press, 2005. – 541 p.

6. Strayer L.M., Hudleston P.J., Lorib L.J. A numerical model of deformation and fluid-flow in an evolving thrust wedge // Tectonophysics. – 2001. – Vol. 335. – P. 121–145.

7. Wissing S.B., Ellis S., Pfiffner O.A. Numerical models of Alpine-type cover nappes // Tectonophysics. – 2003. – Vol. 367. – P. 145–172.

8. Henk A., Nemcok M. Stress and fracture prediction in inverted half-graben structures // J. of Struct. Geol. – 2008. –Vol. 30. – P. 81–97.

9. Potyondy D.O., Cundall P.A. A bondedparticle model for rock // Int. J. Rock Mech. Min. Sci. Geomech. Abstr.. – 2004. – Vol. 41. – P. 1329–1364.

10. Yang Y.R., Hu J.C., Tang C.L., Lin M.L., Lu C.J., Chen W.S. 2-D numerical simulation for the deformation of fault-related folding: case studies for Coseismic Deformation of the Chi-Chi Earthquake at Chushan Trench / In: Taiwan Geosciences Assembly, TGA 2007.

11. Seyferth M., Henk A., Coupling of PFC2D and ANSYS – concepts to combine the best of two worlds for improved geodynamic models / In: Numerical Modelling in Micromechanics via Particle Methods – Konietzky (ed.). – Swets & Zeitlinger, Lisse, ISBN 90 5809 532 0, 2003. – P. 283–290.

12. Rebetskiy Yu.L. Tektonicheskie napryazheniya i prochnost prirodnyih gornyih massivov. – M.: IKTs “Akademkniga”, 2007. – 406 s.