Article
Engineering, Geological
Lei Zhou, Xiaocheng Li, Yu Peng, Binwei Xia, Liulin Fang
Summary: In this study, a numerical tool based on the material point method (MPM) and strain softening constitutive model is developed to simulate the roof strata movement induced by longwall mining. The numerical tool is capable of simulating the complex geomechanical processes involved in the roof strata movement, as well as the large deformation of the backfill and its interaction with the roof subsidence. The tool can be extended to study other excavation problems in underground.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Chuantian Li, Yongliang He, Xiaoyuan Sun, Yuping Fu
Summary: Coal mining causes collapse and destruction of overlying rocks, creating overburdened crevasses that pose a serious safety hazard. This study used the Shaquan mine as a research object to explore the evolution and migration pattern of overburdened fissures during the initial mining period. The results will contribute to improving gas disaster prevention and comprehensive resource utilization theory in high gas and low permeability coal seam mining conditions, enabling coal and gas co-mining and ensuring safe and efficient mine production.
Article
Chemistry, Physical
Andrea Martini, Chiara Negri, Luca Bugarin, Gabriele Deplano, Reza K. Abasabadi, Kirill A. Lomachenko, Ton V. W. Janssens, Silvia Bordiga, Gloria Berlier, Elisa Borfecchia
Summary: This study investigates the mechanism of Cu-exchanged chabazite catalyst in NH3-SCR using in situ X-ray absorption spectroscopy. It is found that the Si/Al ratio of the zeolite affects the structure of Cu-complexes, thereby influencing the catalytic performance of the catalyst.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Energy & Fuels
Qingdong Qu, Rao Balusu, Bharath Belle
Summary: This article investigates the issue of gas emission in longwall coal mines in the Bowen Basin of Australia. Through measurements of different coal seams, it was found that conventional models often underestimate gas emissions, particularly in coal seams distant from the mining seam. In conclusion, a new model was developed for predicting gas emission from roof coal seams.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Engineering, Environmental
Dong Ma, Botao Qin, Yuan Gao, Jianan Jiang, Baochao Feng
Summary: This study focused on investigating methane migration induced by coal spontaneous combustion using a self-designed experimental platform, analyzing the effects of temperature and range of spontaneous combustion on methane distribution, and quantitatively identifying potential areas subject to methane explosions.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Geochemistry & Geophysics
Yujiang Zhang, Caiyi Du, Guorui Feng, Honghui Yuan, Xiaogang Deng, Ronggang Zhang, Renle Zhao, Yuxia Guo
Summary: With the increase of depth and intensity of coal mining, geological disasters in deep engineering occur frequently. This paper studies the subsidence law of overburden after mining and proposes a method to calculate the subsurface subsidence factor. The results show that the method has higher precision and the average error is less than 2%.
Article
Engineering, Geological
Songtao Ji, Hu He, Jurij Karlovsek
Summary: This study applied the superposition method to address the complex issue of strata failure in underground mining, with results indicating that partially yielded coal seams are crucial for simulating reasonable strata behavior.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Multidisciplinary Sciences
Yubing Gao, Qiukai Gai, Kedong Zhang, Qiang Fu, Xingxing Zhang
Summary: ARFRC is a novel nonpillar mining method suitable for use below fault influenced longwall goafs. Field experiments and numerical modelling were used to evaluate the stability of the roadway under special geological conditions. The results show that the geological features surrounding the roadway have a significant impact on its stability. Targeted support techniques were proposed and their reliability was demonstrated through field practice.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
David Ursueguia, Eva Diaz, Salvador Ordonez
Summary: Ventilation Air Methane emissions (VAM) from coal mines are a concern due to their high global warming potential. Adsorption on Metal-Organic Frameworks (MOFs) shows promise for methane selective separation. The properties governing methane-MOF interactions and the effects on methane adsorption selectivity in lean mixtures have been discussed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Geological
Hossein Arasteh, Kamran Esmaeili, Gholamreza Saeedi, Mohammad Ali Ebrahimi Farsangi
Summary: This paper presents the application of the synthetic rock mass numerical modeling approach for the simulation of the roof caving mechanism and the load on shield supports in a longwall coal mine. The proposed numerical approach can be utilized as a reliable tool in the design and safe operation of a longwall panel.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Energy & Fuels
Lu Yuan Wu, Dan Ma, Zifa Wang, Jian Wei Zhang
Summary: The prediction and prevention of water inrush from rock strata separation space is crucial in preventing casualties and equipment damage. Through experiments and observations, it is found that the separation spaces are primarily distributed between sandstone and claystone and have irregular shapes. They are destroyed by water-conducting fissure zones and become channels for water gushing. Separation spaces far from the coal seam have a higher risk of water inrush disasters. The persistence and volume of separation spaces are positively correlated with the thickness and strength of hard rock.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Geosciences, Multidisciplinary
Eric Watkins, C. Ozgen Karacan, Vasu Gangrade, Steven Schatzel
Summary: This study summarizes the changes in permeability at boreholes above an abutment pillar in a longwall coal mine, showing an increase in permeability around the boreholes due to mining-induced deformations. Measuring permeability changes can be an effective method to assess the potential interaction between shale gas wells and the mine environment.
NATURAL RESOURCES RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Guangyuan Song, Kai Du, Yidong Zhang, Zexin Li, Lei Hu
Summary: Green mining is important for achieving environmentally friendly and ecologically sound mining practices. This study focuses on the movement patterns of overlying strata in longwall fully mechanized mining with paste filling, establishing a mechanical model through mathematical analysis and studying the movement behavior through numerical simulations. The research reveals that filling mining exhibits reduced stress concentration, a smaller range of stress influence, and less deformation in the surrounding rock compared to traditional caving mining.
APPLIED SCIENCES-BASEL
(2023)
Article
Energy & Fuels
C. Ozgen Karacan
Summary: Coal mine methane emissions pose safety and environmental concerns. This study focuses on a longwall mine in Virginia, USA, extracting metallurgical coal, and presents a comprehensive analysis and modeling to predict emissions. The results show that pre-mining degasification and closer spacing of drilling horizontal wells can significantly reduce ventilation and gob emissions during coal mining.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Gabriele Deplano, Andrea Martini, Matteo Signorile, Elisa Borfecchia, Valentina Crocella, Stian Svelle, Silvia Bordiga
Summary: In this study, a series of gas-phase reactants were used to investigate the formation of Cu pairs in a Cu-exchanged mordenite zeolite under different reaction environments. The rearrangement of Cu ions to form multimeric sites was studied using X-ray absorption spectroscopy and advanced analysis through wavelet transform. The results showed that under an oxidative environment, Cu-I/Cu-II speciation correlated with Cu proximity, with metal ion pairs quantitatively forming.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)