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Influence of longwall gateroad convergence on the process of mine ventilation network-model tests

International Journal of Mining Science and Technology 2019年第4期29卷 585-590页

作者： andrzej walentek Tomasz Janoszek Stanis?aw Prusek Aleksander Wrana Department of Extraction Technologies Rockburst and Mining Support Central Mining Institute

Hard coal mines are required to constantly ventilate mine workings to ensure that the air composition is at a certain humidity and temperature level that is comfortable for underground mine workers,especially in deep *** underground workings,which are part of the mine ventilation network,should be ventilated in a way that allows maintaining proper oxygen concentration not lower than 19%(by volume),and limits concentration of gases in the air such as methane,carbon monoxide or carbon *** air flow in the mine ventilation network may be disturbed due to the natural convergence(deformation)and lead to change in its original *** the cross-sectional area of the mining excavation causes local resistances in the air flow and changes in aerodynamic potentials,which leads to emergency states in the mine ventilation *** paper presents the results of numerical simulations of the influence of gateroad convergence on the ventilation process of a selected part of the mine ventilation *** gateroad convergence was modelled with the finite element software PHASE *** influence of changes in the cross-sectional area of the gateroad on the ventilation process was carried out using the computational fluid dynamics software Ansys-Fluent.

关键词： Geomechanics Convergence Numerical modelling Ventilation process Support

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Analysis of the damage mechanism of strainbursts by a global-local modeling approach

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1671-1696页

作者： Jun Wang Derek B.Apel Artur Dyczko andrzej walentek Stanislaw Prusek Huawei Xu Chong Wei School of Mining and Petroleum Engineering University of AlbertaEdmontonAlbertaT6G 2R3Canada Jastrze˛bska Spółka We˛glowa S.A.Group Aleja Jana Pawła II 4Jastrze˛bie-Zdrój44-330Poland Central Mining Institute Plac GwarkówKatowice140-166Poland

Strainburst is the most common type of *** research of strainburst damage mechanisms is helpful to improve and optimize the rock support design in the burst-prone *** this study,an improved global-local modeling approach was first adopted to study strainburst damage *** extracted stresses induced by multiple excavations from a three-dimensional(3D)global model established by fast Lagrangian analysis of continua in 3 dimensions(FLAC3D)are used as boundary conditions for a two-dimensional(2D)local model of a deep roadway built by universal distinct element code(UDEC)to simulate realistic stress loading paths and conduct a detailed analysis of rockburst damage from both micro and macro *** results suggest that the deformation and damage level of the roadway gradually increase with the growth of surrounding rock stress caused by the superposition of mining-or excavation-induced stresses of the panel and nearby *** significant increase of surrounding rock stresses will result in more accumulated strain energy in two sidewalls,providing a necessary condition for the strainburst occurrence in the dynamic *** strainburst damage mechanism for the study site combines three types of damage:rock ejection,rock bulking,and *** the strainburst,initiation,propagation,and development of tensile cracks play a crucial role in controlling macroscopic failure of surrounding rock masses,although the shear crack always accounts for the main proportion of damage *** deformation and damage level of the roadway during a strainburst positively correlate with the increasing peak particle velocities(PPVs).The yielding steel arch might not dissipate kinetic energy and mitigate strainburst damage effectively due to the limited energy absorption *** principles to control and mitigate strainburst damage are proposed in this *** study presents a systematic framework to investigate strainburst damage mechanisms

关键词： Strainburst Numerical modeling Damage mechanism Finite difference method(FDM) Discrete element method(DEM) Underground mining

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