ANALYSIS OF DESTRUCTION OF TRANSTROPIC MASSIF AROUND A MINING ALONG AND CROSS THE LAYERS OF THE ISOTROPY PLANE
Keywords:
transtropic massif, fracture mechanics, stress intensity factor, finite element method, Casagrande-Carrilo criterion, mine working, rock fracturingAbstract
This article examines the patterns of crack formation and fracture zone development in the vicinity of an unsupported mine working located in a heterogeneous transtropic rock mass. Using Irwin's direct method and eight-node quadrilateral elements within the FEM framework, the authors verified the Bovey test problem for estimating stress intensity factors. Using an adapted Casagrande-Carrilo criterion, the geometric parameters (length and opening width) of main cracks developing along, across, and at a 45-degree angle to the isotropic plane of a coal seam were numerically modeled under increasing geostatic loading at depths of up to 1000 m.
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