Results 21 to 30 of about 25,519 (265)

Control of Gob-Side Roadway with Large Mining Height in Inclined Thick Coal Seam: A Case Study

Shock and Vibration, 2021
The gob-side roadway of 130205, a large-mining-height working face in the Yangchangwan coal mine, was investigated in terms of the mine pressure law and support technology for large mining heights and narrow coal pillars for mining roadways. The research
Xie Fuxing
doaj   +2 more sources

Pressure Control Technology at the Hard Thick Sandstone Roof in an Island Mining Face with a Large Mining Height

Tehnički vjesnik, 2020
Fracture of a critical stratum on a coal seam roof may cause strong strata pressure behaviours. In particular, a large-scale sudden fracture of the critical stratum, which is formed by hard thick sandstones on a mining face with a large mining height, can easily cause dynamic disasters of wells.
Baojie Fu*, Min Tu, Qingchong Zhao
openaire   +5 more sources

Surrounding rock control technology of 10 m super large mining height working face in Caojiatan Coal Mine [PDF]

Meitan xuebao
The 10 m ultra-large mining height of Caojiatan Coal Mine is a world’s first in terms of single mining height and mining intensity, and the effective control of surrounding rock in the stope is crucial for safe and efficient mining at the working face ...
Rui WANG, Gang XU, Hongpu KANG, Zhen ZHANG, Yajun LEI, Yanjun FENG, Ying MA, Zhizeng HUANG, Qianjin LIU, Xiaogang LIU, Xingyu LIN, Rongshan MA, Zhen ZHAO, Zhengjie LI   +13 more
doaj   +2 more sources

Mechanical characteristics of drum shearer with large mining height under oblique cutting [PDF]

E3S Web of Conferences, 2021
In order to study the dynamic characteristics of the shearer with large mining height of 8.8 m under Oblique cutting, the spatial mechanical model of the Shearer under oblique cutting was established, the angle between the drum and the working face, the ...
Ying Tian, Runxin Zhang, Qiang Zhang
doaj   +2 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. For this aim, theoretical calculation, numerical simulation, and engineering application were applied to study the reasonable cutting ...
Kai Wang, Tong Zhao, Kaan Yetilmezsoy, Xiaoqiang Zhang   +3 more
openaire   +4 more sources

The Effect of Joint Damage on a Coal Wall and the Influence of Joints on the Abutment Pressure on a Fully Mechanised Working Face with Large Mining Height

Shock and Vibration, 2021
Coal wall spalling is regarded as a key technical problem influencing safe and efficient mining of large-mining-height working faces while the distribution of abutment pressure within the limit equilibrium zone (LEZ) influences coal wall spalling within ...
Weibin Guo, Shengwei Zhang, Yuhui Li
doaj   +2 more sources

Key technology and equipment for fully mechanized mining with extra-large shearing height of 10 m in extra-thick coal seam [PDF]

Meitan xuebao
Fully mechanized mining technology with extra-large shearing height is the optimal technical approach to achieve high-yield, high-efficiency and high-recovery mining for 6−10 m ultra-thick coal seam in Chinese coal mines.
Hongpu KANG, Yajun LEI, Futang ZHAO, Gang XU, Zenglin LI, Mingzhong LI, Rui WANG, Zhizeng HUANG, Jiangbin LIU, Ying MA, Cundi HAN, Yanjun FENG, Zhen ZHANG, Jinhu ZHANG, Jianchao REN, Yejie SONG, Mingsheng ZENG, Lixing CHENG   +17 more
doaj   +2 more sources

Theory of coal wall spalling and cooperative control by “support-destressing” in 10 m ultra-large mining height working face [PDF]

Meitan xuebao
Coal wall spalling is one of the main factors restricting the safe production of 10 m ultra-large mining height working face.In response to the problem of unclear mechanism of coal wall spalling and difficult control of surrounding rock in the 10 m ultra-
Jiangbin LIU, Zhizeng HUANG, Qianjin LIU, Zhen ZHANG, Cundi HAN, Xingyu LIN, Rongshan MA, Zhen ZHAO   +7 more
doaj   +2 more sources

Overburden Behavior and Coal Wall Spalling Characteristics Under Large-Mining-Height Conditions

Applied Sciences
Large-mining-height technology has been increasingly applied in thick seam mining to enhance productivity and resource recovery. However, it also intensifies strata pressure and complicates surrounding rock control, leading to greater overburden movement,
Wenze Fan, Lijun Han
doaj   +2 more sources

Key Stratum Structure and Support Working Resistance of Longwall Face with Large Mining Height in the Shallow Coal Seams, China

Advances in Civil Engineering, 2020
The fully mechanized mining with large mining height is the main method for high yield and efficient coal mining in China. The key stratum structure (KSS) is the basis of revealing the mechanism of roof weighting and determination of support working ...
Qingxiang Huang, Jinlong Zhou, Jian Cao
doaj   +2 more sources