Results 51 to 60 of about 4,010 (144)

Rock burst mechanism induced by stress anomaly in roof thickness variation zone: a case study

Geomatics, Natural Hazards & Risk, 2022
The variation of hard roof thickness is an essential contributor in triggering rock bursts during longwall mining. Case analysis and numerical modeling were used to study the stress and energy characteristics of the coal and rock mass and its fracture ...
Xianxi Bai, Anye Cao, Wu Cai, Yingyuan Wen, Yaoqi Liu, Songwei Wang, Xuwei Li   +6 more
doaj   +1 more source

Structural quantification of multi-thick hard roof and strong ground pressure control in large mining height stope: a case study

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
The mining of deep large-height longwall faces leads to frequent occurrences of strong ground pressure, at the same time, there are multi-thick hard rock strata in the roof of the longwall face, therefore, it is important to master the fracture ...
Yangbo Lu, Shaohong Yan, Kunyou Zhou, Chenxi Zhang, Yi Zhou   +4 more
doaj   +1 more source

Evolution of roof treatment processes from blasting to hydraulic fracturing to prevent rockburst in thick-hard roof coal mines in Xinjiang, China

Frontiers in Earth Science
Rockburst prevention poses a major challenge in coal mining, with thick and hard roof strata being the primary cause of rockbursts. To analyze the feasibility and effectiveness of using hydraulic fracturing as an alternative to blasting methods for ...
Kunlun Liu, Taotao Du, Taotao Du, Yuhai Wu, Hongping Li, Xu Yang, Jiang Liu, Hongbao Liang, Jianqi Wang   +8 more
doaj   +1 more source

Deformation and Fracture Mechanisms of Thick Hard Roofs in Upward Mining Coalfaces: A Mechanical Model and Its Validation

Applied Sciences
The safety and efficiency of underground coal mining are threatened by thick hard roofs characterized by large overhang areas, problematic spontaneous caving, and high dynamic load upon their breakage.
Wei Zhang, Linchao Cao, Dongsheng Zhang, Yang Hu, Jingyu Chang, Zhenying Zhang   +5 more
doaj   +1 more source

Applications of Advanced Presplitting Blasting Technology in the Thick and Hard Roofs of an Extra-Thick Coal Seam

Processes
Based on the engineering conditions of the 1303 working face in Zhaoxian Coal Mine, this study investigates the characteristics of mine pressure behavior and the stress-relief mechanism of advanced presplit blasting in a working face with a thick and hard roof in an extra-thick coal seam.
Shouguo Wang, Kai Zhang, Bin Qiao, Shaoze Liu, Junpeng An, Yingming Li, Shunjie Huang   +6 more
openaire   +1 more source

Mechanism of grouped collapse of thick and hard roof for gob-side entry retaining combined backfill in fully-mechanized caving face

Meitan xuebao
A large range of caving roof of gob-side entry retaining is easy to cause impact damage of the roadside backfill body. In order to ensure the stability of gob-side entry retaining, different from the traditional large-angle inclined roof cutting method ...
Guorui FENG, Zijie MA, Wenda WU, Jianbiao BAI, Sunwen DU, Jinwen BAI, Lujin HE   +6 more
doaj   +1 more source

Research on the bearing characteristics of brackets in thick hard roof mining sites and the effect of blasting on roof control

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
AbstractDeep mining stress increase and thick hard rock layer endowment drive rock body fissure expansion, leading to sudden fracture of the roof plate accidents. The roof slab of 11,129 working face in Zhangji Mine is a 16 m thick sandstone composite roof slab, whose compressive strength reaches 89.8 MPa.
Jiaxin Dang, Min Tu, Xiangyang Zhang, Qingwei Bu   +3 more
openaire   +2 more sources

Experiment Study on the Mechanical Behavior and Acoustic Emission Response of Thick and Hard Sandstone Roof in Xinjiang Mining Area

Advances in Civil Engineering
One of the primary threats to coal mine safety production is the sudden extensive fracturing and collapse of thick and hard roof strata. A range of uniaxial compression experiments with acoustic emission (AE) monitoring was performed for studying the ...
Dongdong Qin, Zechao Chang, Ze Xia
doaj   +1 more source

A Composite Pressure Relief Method Based on Roof Cutting and Fracturing Expansion for Thick Hard Roofs in Large Mining Heights

International Journal of Geomechanics
Abstract In coal mining, thick and hard roof strata are widely distributed, posing significant hazards that easily lead to various issues such as extensive deformations of the surrounding rock and failure of support systems due to strong mining pressure, resulting in frequent safety incidents.
Jun Yang, Hongxu Song, Yubing Gao, Qiang Fu, Jianning Liu, Yuxuan Liu, Hongyu Jin   +6 more
openaire   +1 more source

Characteristics of mine pressure and roof disaster prevention and control technology on hard and thick roof of working face

Meitan kexue jishu
Mine pressure appears extremely strong during mining in hard and thick roof working faces. The prevention and control of this type of roof disaster has always been a problem that has plagued the safe and efficient production of working faces in my ...
Gang XU, Zhen ZHANG, Zhengjie LI, Yanjun FENG, Chunhui ZHANG, Jisheng XUE, Qianjin LIU, Xingyu LIN, Rongshan MA   +8 more
doaj   +1 more source