Results 31 to 40 of about 10,633 (207)

Control of the Chamber in Extra‐Thick Coal Seam Based on Fracture Characteristics of Coal Rock and Mass [PDF]

Advances in Civil Engineering, 2020
As the development characteristics of cracks of the chamber are closely related to the bolt and cable anchoring parameters, the original rock stress of the surrounding rock, and fracture degree, this paper proposes the control method for chamber in extra‐thick coal seam by the crack development characteristics.
Yang Tai, Guozhi Lu, Hongchun Xia, Jinrong Liu, Yanqun Zhang   +4 more
openaire   +2 more sources

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

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

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

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

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

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

Analysis on Influence Factors of Roadway Instability in High‐Stress, Steeply Inclined Extra‐Thick Coal Seam [PDF]

Advances in Civil Engineering, 2021
In order to solve the problem of roadway support safety in coal mining under high stress conditions and to improve safe and efficient production in coal mines, the control countermeasures of the surrounding rock stability and the optimization scheme of support are put forward and the model and numerical simulation of roadway bolt support system are ...
Hai Rong, Liting Pan, Xiaoyan Li, Ming Wang, Zeliang Qu, Mengsheng Lu, Kaipeng Guo   +6 more
openaire   +2 more sources

The Key Stratum Structure Morphology of Longwall Mechanized Top Coal Caving Mining in Extra-Thick Coal Seams: A Typical Case Study

Advances in Civil Engineering, 2020
Longwall mechanized top coal caving mining (LMTCCM) in extra-thick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal ...
Fulian He, Xiaobin Li, Wenrui He, Yongqiang Zhao, Zhuhe Xu, Quansheng Li   +5 more
doaj   +1 more source

Geophysical characterization of derelict coalmine workings and mineshaft detection: a case study from Shrewsbury, United Kingdom [PDF]

, 2009
A study site of derelict coalmine workings near Shrewsbury, United Kingdom was the focus for multi‐phase, near‐surface geophysical investigations. Investigation objectives were: 1) site characterization for remaining relict infrastructure foundations, 2)
Cassidy, NJ, Caunt, S, Husband, CR, Jones, GM, Lane, VS, Pringle, JK, Stimpson, IG, Styles, P, Toon, SM   +8 more
core   +2 more sources