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| 1 | Influence of longwall gateroad convergence on the process of mine ventilation network-model tests显示文摘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 deposits.All 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 dioxide.The air flow in the mine ventilation network may be disturbed due to the natural convergence(deformation)and lead to change in its original cross-section.Reducing 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 network.This 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 network.The gateroad convergence was modelled with the finite element software PHASE 2.The 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. | Andrzej Walentek Tomasz Janoszek Stanis?aw Prusek Aleksander Wrana | 2019 | International Journal of Mining Science and Technology2019，29，4： | 2 |
| 2 | Investigation of pearlite structure by means of electron backscatter diffraction and image analysis of SEM micrographs with an application of the Hough transform 显示文摘 | Artur Walentek Marc Seefeldt Bert Verlinden | 2008 | Materials Science and Engineering A2008，，： | 1 |
| 3 | Investigation of pearlite structure by means of electron backscatter diffraction and image analysis of sem micrographs with an application of the hough transform显示文摘 | Walentek A Seefeldt M Verlinden B | 2008 | Materials Science and Engineering A2008，，： | 1 |
| 4 | Electron backscatter diffraction on pearlite structures in steel显示文摘 | Walentek A Seefeldt M Verlinden B | 2006 | Journal of Microscopy2006，224，3： | 1 |
| 5 | Differential expression of transforming growth factor - beta isofoims in bullous keratopathy corneas 显示文摘 | Strzalka- Mrozik B Stanik- Walentek A Kapral M | 2010 | Mol Vis2010，16，： | 1 |
| 6 | Modeling work hardening of pearlitic steels by phenomenological and Taylor-type micromechanical models显示文摘 | Xiaohua Hu Paul Van Houtte Martin Liebeherr Artur Walentek Marc Seefeldt Hendrik Vandekinderen | 2005 | Acta Materialia2005，，4： | 1 |
| 7 | Analysis of the damage mechanism of strainbursts by a global-local modeling approach显示文摘Strainburst is the most common type of rockbursts.The research of strainburst damage mechanisms is helpful to improve and optimize the rock support design in the burst-prone ground.In this study,an improved global-local modeling approach was first adopted to study strainburst damage mechanisms.The 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 perspectives.The 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 roadways.The 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 stage.The strainburst damage mechanism for the study site combines three types of damage:rock ejection,rock bulking,and rockfall.During 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 levels.The 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 capacity.The principles to control and mitigate strainburst damage are proposed in this paper.This study presents a systematic framework to investigate strainburst damage mechanisms using the global-local modeling approach. | Jun Wang Derek B.Apel Artur Dyczko Andrzej Walentek Stanislaw Prusek Huawei Xu Chong Wei | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，6： | 0 |
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