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THE PROTECTION OF MINE WORKINGS IN THE TECTONICALLY STRESSED ROCK MASS
Abstract
The paper presents the results of geomechanical research of the state of mine workings located in the bearing pressure zone at a rockburst hazardous deposit. The aim of the research is substantiation of the measures to protect the mine workings from the impact of high tectonic stresses. The stress-strain state calculations were carried out by the finite element method in volumetric setting. Numerical models have been developed on the basis of in-situ measurements data of stress field parameters. The stress-relief measures at rockburst hazardous deposits have been applied at several scale levels. The first one is a local level that allows reducing the stresses in a near-marginal part of mine workings and pillars. The second one is a regional level carried out within the mining field, a level or a block. The parameter of the stress strain state, which should first of all be taken into account when developing a protective measure, is the direction of maximum component of principal stresses. A significant effect of rock mass stress relief is achieved when creating cavities perpendicular to the action of maximum component of principal stresses. As a result of numerical experiments, the conditions for the maximum efficiency of drilling a string of deep boreholes from the overlying level for unloading the mine workings of the underlying one are substantiated. Model generation and stress-strain state calculations were carried out in the Sigma GT software, which implements the finite-element method in a volumetric formulation and allows modeling stress and strain fields taking into account the main geological and mining-engineering factors.
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References7
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Kozyrev A.A., Enyutin A.N., Maltsev V.A., Semenova I.E. Methodology for regional forecast of rockburst hazard and rock mass state and selection of technical solutions to ensure safety and efficiency of mining / Science – Production: Apatity, Russia. - 2005. pp. 52-56.
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