Results 1 to 10 of about 844 (164)

Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams

International Journal of Mining Science and Technology, 2015
Aimed at determining the appropriate caving–mining ratio for fully mechanized mining of 20 m thick coal seam, this research investigated the effects of caving–mining ratio on the flow fields of coal and waste rocks, amount of cyclically caved coal and ...
Ningbo Zhang, Changyou Liu, Mengsong Pei
doaj   +5 more sources

Cutting-Caving Ratio Optimization of Fully Mechanized Caving Mining with Large Mining Height of Extremely Thick Coal Seam [PDF]

Advances in Civil Engineering, 2019
Serious rib spalling and low recovery rate problems caused by the poor top-coal caving property (TCCP) were investigated in fully mechanized caving mining with large mining height (FMCMLMH) of extremely thick coal seam.
Kai Wang, Tong Zhao, Kaan Yetilmezsoy, Xiaoqiang Zhang   +3 more
doaj   +4 more sources

Top coal caving mining technique in thick coal seam beneath the earth dam

International Journal of Mining Science and Technology, 2017
It is important to study the mining technology under structures for raising the coal resources recovery ratio. Based on the geological and mining conditions, the top coal caving harmonic mining technique in thick coal seam beneath the earth dam was put ...
Wenbing Guo, Yi Tan, Erhu Bai
doaj   +4 more sources

Dynamic Random Arching in the Flow Field of Top-Coal Caving Mining

Energies, 2018
The large mining height fully mechanized top-coal caving mining technique has developed rapidly and become the most extensively used mining method for ultra-thick coal seams. The arching of coal/gangue and the drawing out of gangue are peculiar phenomena
Ningbo Zhang, Changyou Liu, Xiaojie Wu, Tingxiang Ren   +3 more
doaj   +5 more sources

Influences of coal-rock interface morphology’s spatiotemporal evolutionary characteristics on top coal caving law [PDF]

Scientific Reports
The work examined how the spatiotemporal evolution of the coal-rock interface morphology affected the top coal caving ratio. The geological conditions of the 3307 fully mechanized caving face at Tang’an Coal Mine served as the research context.
Yupeng Shen, Tuo Yang, Jianzhuang Liu, Yang Li, Jianqiao Luo, Xiaonan Zhang   +5 more
doaj   +3 more sources

Mining technology and support optimization design of super high fully mechanized caving and small mining ratio in hard and extra thick coal seam

Meikuang Anquan, 2021
In order to realize the safety, high efficiency and high recovery rate mining of 9-13 m thickness hard coal seam in Jinjitan Coal Mine, the top coal recovery rate and coal wall stability of different cutting heights are analyzed by theoretical analysis ...
MENG Xiangjun, ZHANG Jinhu, LI Mingzhong, YUE Ning, XU Yongxiang, TONG Peng, CAI Fenghua   +6 more
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Study on Caving Property of Top Coal in Fully Mechanized Caving Face with Double Inclined and Large Dip Angle

Meikuang Anquan, 2020
In order to study the influence of different incline angles on the shape of top coal caving body, and the influence of different strike angles and different caving styles on the top coal caving rate of large angle fully mechanized top coal caving face ...
ZHANG Bei, YANG Yuanzhong
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Determination on Reasonable Mining Height and Top Coal Caving Technology in Huating Coal Mine

Meikuang Anquan, 2020
In view of the problems, such as coal wall spalling, roof caving and low recovery rate of top coal in 250107-1 fully mechanized caving face of Huating Coal Mine at present, the method of combining FLAC3D numerical analysis and theoretical calculation ...
QIAO Zhongdong, QU Ying, YANG Guohong, LIU Biao
doaj   +2 more sources

Deformation characteristics of weakly cemented overburden in Western mining areas in China [PDF]

Scientific Reports
Understanding the deformation behavior of weakly cemented overburden in western coalfields is critical for assessing mining-induced instability and groundwater hazards. Taking the 23 − 2 coal seam of Yili No.
Guanyu Zhang, Haozhen Zhang, Guo Li, Juntao Chen, Long Zhao, Guangneng Zhou   +5 more
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Optimization of drawing parameters based on top-coal flow law in thick-seam caving mining [PDF]

Scientific Reports
With the continuous advancement of coal mining technology and widespread application of modern equipment, fully mechanized top-coal caving (FMTC) mining has become an efficient and economical option for thick coal seam mining.
Shixiong Wu, Xun Xu, Jun Wang, Dezhong Kong, Guiyi Wu, Qinzhi Liu, Yujun Zuo   +6 more
doaj   +2 more sources