Results 31 to 40 of about 437 (161)

Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams [PDF]

Energies, 2020
A particle element approach based on continuum-discontinuum element method (CDEM) is applied to optimize the automated top-coal drawing techniques in extra-thick coal seams. Numerical models with 100 drawing openings are created according to the field engineering geological conditions of Tongxin coal mine in China.
Qunlei Zhang, Ruifu Yuan, Shen Wang, Dongyin Li, Huamin Li, Xuhe Zhang   +5 more
openaire   +2 more sources

Failure Characteristics and Stability Control of Bolt Support in Thick-Coal-Seam Roadway of Three Typical Coal Mines in China

Shock and Vibration, 2021
Roadways in thick coal seams are widely distributed in China. However, due to the relatively developed cracks and brittleness of coal, the support failure of thick-coal-seam roadways frequently occurs. Therefore, the study of bolt failure characteristics
Zhe Xiang, Nong Zhang, Deyu Qian, Zhengzheng Xie, Chenghao Zhang, Feng Guo, Sujian Wang   +6 more
doaj   +1 more source

Overlying Strata Movement and Abutment Pressure Evolution Process of Fully Mechanized Top Coal Caving Mining in Extra Thick Coal Seam

Geofluids, 2021
Taken overlying strata of fully mechanized top coal caving mining (FMTCCM) in 15 m extra thick coal seam as the research object, the comprehensive research methods such as field investigation, theoretical calculation, and numerical analysis are used to ...
Yongqiang Zhao, Yingming Yang, Xiaobin Li, Zhiqi Wang   +3 more
doaj   +1 more source

Study on Gas Comprehensive Control Technology in Steep and Extra Thick Coal Seam

IOP Conference Series: Earth and Environmental Science, 2021
Abstract In order to improve the gas drainage amount and drainage rate of steeply inclined and extra thick coal seam and realize the safe and efficient mining of coal mine, the distribution and evolution law of surrounding rock stress field and fracture field of horizontal slicing mining face in steeply inclined coal seam were revealed ...
Chunming Mu, Yongsan Liu
openaire   +1 more source

Energy accumulation characteristics and rockburst mechanism of surrounding rock at heading face of extra-thick coal seam

Yantu gongcheng xuebao, 2019
Taking the extra-thick coal seam heading face in Liuhuanggou Coal Mine as the engineering background, the energy accumulation characteristics and rockburst mechanism of the surrounding rock at heading face of extra-thick coal seam are studied using field
ZHU Si-tao 1, JIANG Fu-xing 1, WANG Xu-you 2, JIANG Yi-wu 2, NING Ting-zhou 2, SUN Shao-hua 2
doaj   +1 more source

Surrounding rock activity law and support optimization of double flexible formwork wall gob-side entry retention in stratified mining coal seams

Energy Exploration & Exploitation, 2023
To ensure gas control in the layered mining of extra-thick coal seams in Baijigou Coal Mine—in addition to reducing the loss of coal resources and amount of roadway driving—this article proposes the gob-side entry retention technology of flexible ...
Xiaofan Cao, Xiaoli Wang, Zhiqiang Zhang, Haoliang Zhao, Song Wang, Xinyun Cao, Mingxing Liu   +6 more
doaj   +1 more source

Cooperative Control Mechanism of Long Flexible Bolts and Blasting Pressure Relief in Hard Roof Roadways of Extra-Thick Coal Seams: A Case Study

Applied Sciences, 2021
The higher strength of a hard roof leads to higher coal pressure during coal mining, especially under extra-thick coal seam conditions. This study addresses the hard roof control problem for extra-thick coal seams using the air return roadway 4106 (AR ...
Zhe Xiang, Nong Zhang, Zhengzheng Xie, Feng Guo, Chenghao Zhang   +4 more
doaj   +1 more source

Disastrous Mechanism of Water Discharge in Abandoned Gob above the Stope in Mining Extra-Thick Coal Seam

Geofluids, 2021
The Datong mining area is a typical double system coal seam mining area in China, where the Jurassic and Carboniferous coal seams are mined simultaneously. The upper Jurassic coal seam has been largely mined, leaving a large amount of gob area.
Haixiao Lin, Feng Yang, Zhengzheng Cao, Yue Wang, Xiaojian Jiao   +4 more
doaj   +1 more source

Research on Top Coal Caving Technique in Steep and Extra-Thick Coal Seam

Procedia Earth and Planetary Science, 2011
AbstractReasonable caving method is an important guarantee of realizing high-yield and high-efficient of the working face. Based on the specific conditions of the 2637 working face in Zhaogezhuang Mine, compared extraction rates under different top coal caving technology with field tests and similar material simulation, adopted the multi-turns interval
Zhang, Juguo, Zhao, Zhiqiang, Gao, Yang
openaire   +1 more source

Numerical Simulation Study on Fully-Mechanized Top Coal Caving in Extra-Thick Coal Seam

IOP Conference Series: Earth and Environmental Science, 2020
Abstract Three working face of a mine 250203, 250205, 250206 as the research object, the establishment of a geomechanical model according to the actual situation of the project. FLAC3D using numerical simulation method to analyze section coal pillar width in 20 m, 10 m, when 0 m, Face sequential mining process key strata caving stride ...
Wu-lin Lei, Xingliang Li, Yanfeng Chen, Weihua Duan, Jianhua Chen   +4 more
openaire   +1 more source