Florin Dumitru POPESCU, Ciprian-Gheorghe DANCIU, Andrei ANDRAȘ, Ildiko BRÎNAȘ, Sorin Mihai RADU, Mirela Ancuța NEAGA (RADU)


FDEM (Finite Discrete Element Method) is a computational numeric method [1-3] that permits dynamic simulation of the interaction of several bodies. Thus, when meeting a fracture criterion, bodies can elastically deform, have translational and rotational movements, interact and fracture. These processes lead to the formation of other discrete bodies which in turn can undergo movements, interactions, deformations and fractures. The Geomechanica IRAZU software package used to perform all simulations within this paper is based on the FDEM concept, thus being a versatile tool for simulations specific to rock mechanics. In the paper a computerised simulation of the shear strength test along an imposed plane was conducted for lignite. In order to achieve this, a series of theoretical aspects regarding shear strength were presented, along with standardized shear testing methods, as well as the steps to be followed to simulate the shear strength test.

Full Text:



Munjiza, A. The Combined Finite-Discrete Element Method. Hoboken: John Wiley & Sons, Hoboken, NJ, 333 pp, 2004.

Mahabadi, O.K., Lisjak, A., Munjiza, A., Grasselli, G. Y-Geo: New Combined Finite-Discrete Element Numerical Code for Geomechanical Applications. International Journal of Geomechanics, 12, 676–688, 2012.

Lisjak, A., Kaifosh, P., He, L., Tatone, B., Mahabadi, O. K., Grasselli, G. A 2D, fullycoupled, hydro-mechanical, FDEM

formulation for modelling fracturing processes in discontinuous, porous rock masses. Computers and Geotechnics, 81, 1-

, 2017. Cook, N.G.W., Klokow, J.W., White, A.J.A. Practical rock mechanics for gold mining (PRD series no. 167). Johannesburg:

Chamber of Mines of South Africa, 1974.

Galvin, J. M. Ground engineering-principles and practices for underground coal mining. Springer, 2016.

Patton, F.D. Multiple modes of shear failure in rock. ISRM Congress. ISRM, 1966.

Hoek, E., Kaiser, P.K., Bawden, W.F. Support of Underground Excavations in Hard Rock. CRC Press, 2000.

Backers, T., Stephansson, O. ISRM Suggested Method for the Determination of Mode II Fracture Toughness. Rock Mech Rock Eng, 45, 1011–1022, 2012.

Muralha, J., Grasselli, G., Tatone, B., Blümel, M., Chryssanthakis, P., Yujing, J. ISRM suggested method for laboratory

determination of the shear strength of rock joints: revised version. Rock Mech Rock Eng, 47, 291-302. 2014.

Danciu, C. Mecanica rocilor, Editura Universitas, Petroşani, 2011.

ASTM D4543-08 standard practice. American Society for Testing and Materials (ASTM) International, 2008.

Popescu, F. D., Radu, S.M., Andras, A., Kertesz, I. Infografică, modelare şi simulare asistată de calculator, Editura Universitas,

Petroşani, 2020.

Geomechanica Inc, Irazu 2D Geomechanical Simulation Software. V. 5.1. Theory Manual, 2022.

Ayachit, U. The ParaView Guide: A Parallel Visualization Application, Kitware,


  • There are currently no refbacks.