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Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof [PDF]

Energies, 2021
This article introduces a new non-pillar coal mining technology (i.e., Gob-side Entry Retaining by Roof Cutting (GERRC)) under the condition of thick and hard roofs. First, we theoretically analyzed the solution to the large suspension span of the thick and hard roof in coal mining.
Xiaoyu Liu, Manchao He, Jiong Wang, Zimin Ma   +3 more
doaj   +5 more sources

Combined blasting for protection of gob-side roadway with thick and hard roof

Journal of Rock Mechanics and Geotechnical Engineering
The deformation control of surrounding rock in gob−side roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining. To address this issue, a novel approach combining directional and non-directional blasting techniques, known as combined blasting, was proposed.
Qiang Fu, Jun Yang, Yubing Gao, Changjiang Li, Hongxu Song, Yuxuan Liu, Xing Wu   +6 more
doaj   +5 more sources

Ground fracturing pre-control technology for potential mine seismic risk of thick and hard roof

Meitan kexue jishu, 2023
Mines with thick and hard roof face high risks of mine seismic activities and mine pressure during mining, which easily leads to dynamic disasters in mines. To pre-control and prevent such risks, it is necessary to pre-control the thick and hard roof of the mine.
Shuwen WANG, Baoyan ZHI, Taotao DU, Guangyu YANG, Chuang LU, Yongxue XIA   +5 more
openaire   +3 more sources

Influence mechanism of thick hard layer on fracture and energy release characteristics of composite roof. [PDF]

Sci Rep
Investigating the instability and energy release characteristics of layered roof structures is crucial for elucidating the mechanism of rockburst induced by strata fracture.
Song XS, Wang ZQ, Zhang PF, Guo L, Zhao TB, Han GW.   +5 more
europepmc   +2 more sources

Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof

矿业科学学报, 2021
Yima coal field has an extra-thick hard rock strata, which is the main cause of many dynamic disasters in the mining area. Based on the mining face 21221 of Qianqiu mine in Yima coal field, Henan Province, China, this paper studies the movement characteristics of extra-thick hard roof during the advancement of working face by similar simulation and ...
Wang Hongwei, Deng Daixin, Jiang Yaodong, Shi Ruiming, Yang Guozhen, Zhang Xiaohai   +5 more
openaire   +3 more sources

Analysis of overburden structure and evolution characteristics of hard roof mining in extremely thick coal seam

Meitan kexue jishu, 2023
The mining of extremely thick coal seam form a large space stope, the fracture disturbance of hard roof spreads to a wide range, the working face weighting has the characteristic of “strong mine pressure”, it is obviously different from rock burst, especially when the coal seam roof “square” mining period, the stope mine pressure is more intense. Based
YU Bin, KUANG Tiejun, YANG Jingxuan, ZHU Weibing   +3 more
openaire   +3 more sources

Evolution of broken structure of hard thick roof and analysis of impact hazard area

Meikuang Anquan
Aiming at the influence of hard and thick roof fracture and structural evolution on the impact of working face, taking the hard and thick roof condition of 63 upper 05 working face in Dongtan Coal Mine as the engineering background, the critical condition and structural evolution process of hard and thick roof fracture and instability are studied by ...
Pengfei LYU, Xuekai CUI, Zhuang MIAO, Kangbin LU, Yijian GENG   +4 more
openaire   +3 more sources

Dynamic failure and stability model analysis of thick and hard rock with wedge-structure immediate roof occurrence

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2021
To eliminate roof-control disasters typically encountering in mines with thick and hard rock strata, fracture characteristics, instability mechanism and prevention methods were investigated in the study. A mine stope with thick and hard main roof and wedge-structure immediate roof in Zhuxianzhuang Coal Mine was taken as the background.
Tong Zhao, Peilin Gong, Kaan Yetilmezsoy, Majid Bahramian, Changyou Liu   +4 more
openaire   +3 more sources

Research on blasting technology for thick and hard roof fracturing in isolated island coal mine working face. [PDF]

Sci Rep
Abstract In order to study the prevention and control technology for hard roof type coal burst in the isolated working face of the Chenjiashan coal mine, the 418 isolated working face was selected as the engineering case study. Based on the different impact danger zones and mining areas, a roof breaking blasting pressure relief technical ...
Huang W, Jing G, Ma L, Zhao L, Wang S.
europepmc   +4 more sources

Experimental study on the strain energy evolution mechanism of thick and hard sandstone roof in Xinjiang Mining Area

Heliyon
For understanding the mechanical performance and strain energy evolution mechanism of thick hard roof sandstone samples, a sequence of uniaxial compression trials with acoustic emission (AE) monitoring were carried out. The results indicate: (1) The stress-strain curve of the thick hard roof sandstone specimens exhibits distinct stage characteristics ...
Dongdong Qin, Zechao Chang, Ze Xia
openaire   +4 more sources