Slashchov І.M. Estimation of fracture systems parameters in rock massif by the finite element method

Details

Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 147

Geoteh. meh. 2019, 147, 150-163

https://doi.org/10.1051/e3sconf/201910900094

ESTIMATION OF FRACTURE SYSTEMS PARAMETERS IN ROCK MASSIF BY THE FINITE ELEMENT METHOD

¹Slashchov І.M.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC 622.831.31

Language: English

Abstract.

. Results of analytical, laboratory and mine studies of parameters of disintegration zones in structurally-heterogeneous rocks and fracture systems around of the deep mine roadways are presented. The purpose of research is to improve safety and efficiency of underground mining operations by developing new methods, algorithms and modern specialized programs, which will determine parameters of zoning and spatial orientation of fracture system development in the rock massifs. Methods used: constructing the structures and software models of information systems for developing basic elements for software and information technology for geomechanical process calculation by the finite element method; mathematical modeling of the rock-massif stress-strain state by the finite element method; analysis and assessment of parameters of fracture systems in the structurally-heterogeneous rock massif. A mathematical model is proposed, which is realized with the help of the procedures of simulation modeling by finite element method. Based on the calculation of possible directions of the rock shearing (the “rock shear sites”) and breakage of bonds between the elements, the model allows determining orientation of dominant master fracture system development with taking into account natural structural defects in the rock massif. A new algorithm was created for determining master cracks and boundaries of disintegration zones with the layered rock, which differs by determining directions of rock shear sites in the elastoplastic problem considering residual strength and main structural defects of the structurally-heterogeneous rock massif. Regularities of organization of unidirectional rock shear sites and their distribution under the influence of mining operations in zones with inelastic deformations were established. The conducted studies disclose new possibilities for analyzing the stress-strain state of the rock massif allowing to forecast the most probable directions of crack development, and, therefore, to study complex geomechanical processes in more details.

Keywords: stress-strain state of rocks, crack systems, finite element method.

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About the authors

Slashchov Ihor Mykolayovych, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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