STRESS AND STRAIN DISTRIBUTION IN GEOMASS UNDER ROOM-AND-PILLAR MINING OF A THICK GENTLY DIPPING COAL BED
The results of numerical modeling of geomechanical processes in coal pillars, the roof rocks and soil chambers in layered mining of thick flat coal seam with chamber and pillar system of development. For numerical simulation applied finite element method for two-dimensional with the full vector of stresses and deformations, vertical and horizontal displacements of the coal seam and enclosing rocks, the relation of residual strength of coal and rocks to the source strength, the energy of deformation for the prediction of foci of rock bursts. Considered options for changing the parameters of the stress-strain state of coal-rock mass in the zone of influence of a single chamber, with partial interchamber pillar extracting splitting, the mutual influence of multiple chambers. Identified hubs boundary stresses in coal pillars and soles of chambers. Areas of increased risk of rock bursts after holding 5—6 cameras are located in the neighborhood of last in row chambers.
Keywords
Rock mass, stress-strain state, numerical simulation, finite element method, a set of programs, increased rock pressure, part of the coal seam, the coal seam, the extraction chamber, the extraction of coal in the sides of the excavation.
Issue number: 9
Year: 2017
ISBN:
UDK: [622.831:622.273.3]:519.876.5
DOI: 10.25018/0236-1493-2017-9-0-170-178
Authors: Cherepov A. A., Shiryaev S. N., Kulak V. Yu.
About authors: Cherepov A.A., Technical Director,
e-mail: Andrey.Cherepov@evraz.com,
LLC «Raspadskaya Coal Company», Novokuznetsk, Russia,
Shiryaev S.N., Technical Director,
e-mail: sn_shir@mail.ru,
LLC «Managing company «EVRAZ Mezhdurechensk»,
Novokuznetsk, Russia,
Kulak V.Yu., General Director,
e-mail: Vitaly.Kulak@evraz.com,
JSC «Promugleproekt», Novokuznetsk, Russia.
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