Results 41 to 50 of about 670,391 (188)

Improving recovery in sublevel top coal caving mining by using partially reverse drawing technique

International Journal of Mining Science and Technology
The sublevel top coal caving (SLTCC) mining technology is extensively employed in steeply inclined thick coal seams. Because of the typical characteristics of the short coal face in this mining method, a significant portion of the top coal is lost at the
Jinwang Zhang, Dongliang Cheng, Jiachen Wang, Shengli Yang, Xiaohang Wan, Xinyang Li   +5 more
doaj   +1 more source

Coal wall bending calculation and spalling risk classification using Chebyshev polynomials

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
In view of the severe constraints of coal wall spalling and roof caving problems on the productivity release and intelligentization process of large mining height working faces, this paper comprehensively analyzes the key factors affecting coal wall ...
Zhining Zhao, Weidong Pan, Baiyu Hu, Guocheng Zhang, Cang Deng, Xiyuan Qin, Yupei Deng   +6 more
doaj   +1 more source

A theoretical model for drawing body in sublevel top coal caving mining and its validations

Journal of Rock Mechanics and Geotechnical Engineering
The sublevel top coal caving (SLTCC) mining is widely employed in steeply inclined and thick coal seams. In SLTCC, the large coal drawing height and the influence of roof and floor boundaries introduce significant complexity into the coal extraction ...
Jinwang Zhang, Xiaohang Wan, Shengli Yang, Melih Geniş, Ahmet Özarslan, Dongliang Cheng, Weijie Wei, Haobo Zhang, Zhengyang Song, Jin Zhao   +9 more
doaj   +1 more source

Application of intelligent top-coal caving technology in overlying aquifer protection of extra-thick coal seam [PDF]

The grassland areas in eastern Inner Mongolia and northern Xinjiang are rich in coal and groundwater resources. The mining fissures formed by high-intensity coal mining are easy to lead to the strong water-rich aquifer, and it is very easy to cause the ...
Lihui ZHANG, Weidong PAN, Weixuan CHENG, Xin HE, Shengyou LIU, Jingchuan CHEN   +5 more
core   +1 more source

Kinetics‐Controlled Architecture of Binder‐Free Organic Electrodes for Enhanced Ion Transport

Advanced Functional Materials, EarlyView.
Pulse reverse electrodeposition controls nucleation and growth to create hierarchically porous Py‐derived oligomeric electrodes with enhanced ionic accessibility and reduced transport resistance. The resulting binder‐free architectures translate these transport advantages into practical sodium‐storage functionality.
Satendra Kumar, María del Carmen Giménez‐López   +1 more
wiley   +1 more source

Evaluation of the migration and environmental effects of metal elements within cementitious gangue-fly ash backfill in underground coal mines

International Journal of Mining Science and Technology
Cementitious gangue-fly ash backfill (CGB) is used as a green mining technology worldwide. However, under the coupled effects of geological stress and groundwater, the metal elements in the CGB tend to migrate into nearby strata, which can consequently ...
Xuejie Deng, Yuan Jiao, Shicong Li, Nan Zhou, Yan An, Erol Yilmaz, Qingxue Zheng, Xifeng Liang   +7 more
doaj   +1 more source

High‐Performance Bio‐Based Epoxy Vitrimers and Composites: Synergizing Robustness and Reprocessability via Fractional Free Volume Regulation

Advanced Science, EarlyView.
In this work, two bio‐based epoxy monomers were designed to tune the dynamic network of a rigid–flexible hybrid epoxy through free‐volume control, achieving a synergy among high free volume, high cross‐linking density, and segmental mobility while balancing strength and toughness.
Kai Dong, Di Zhao, Chengji Zhao
wiley   +1 more source

Comprehensive mining method of group drawing and automated drawing during longwall top coal caving

International Journal of Coal Science & Technology
To address issues such as inefficient top-coal drawing, challenges in simultaneously mining and drawing, and the need for intelligent control in extra-thick coal seams, this study examines the principles of top-coal drawing and explores automation and ...
Weidong Pan, Zhining Zhao, Peng Gao, Xinyuan Li, Kunming Zhang, Cang Deng, Suyu Liang   +6 more
doaj   +1 more source

Impact of surface irregularities on coal wall stability and support mechanisms: Insights from physical and numerical experiments

International Journal of Mining Science and Technology
Coal wall stability is a critical factor influencing coal mining efficiency and threatens the safety of working faces, where irregular coal wall surfaces significantly affect the contact and support effectiveness of the support plate, thereby impacting ...
Jiachen Wang, Xiang Yu, Zhong Huang, Lianghui Li, Yubing Wang   +4 more
doaj   +1 more source

Research on Rock Burst Laws and Prevention in Deep Hard Roof Coal Seam Mining

Meikuang Anquan, 2020
Based on the research of deep hard roof thick coal seam mining in Gucheng Coal Mine, this paper analyzes the inducement of 2103 working face rock burst accident, summarizes the law of mine rock burst, and concludes that the deep thick coal seam mining ...
ZHAO Meng, ZHANG Xiaoming, WANG Nan, SUN Huaiming, SU Renyuan, TIAN Xinyuan
doaj   +1 more source