Results 81 to 90 of about 4,616 (263)

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

The Tree of Life Synagogue Attack: A Terrorist Radicalization Assessment Protocol‐18 Examination of Pre‐Attack Warnings and Post‐Attack Contagion and Copycat Effects

Behavioral Sciences &the Law, EarlyView.
ABSTRACT This is a retrospective case study of an antisemitic lone actor terrorist who completed the deadliest attack against the Jewish community in American history. The analysis through the lens of the Terrorist Radicalization Assessment Protocol (TRAP‐18) finds that 72% of the warning indicators were present, including four proximal warning ...
Molly Amman, Julia Kupper, J. Reid Meloy
wiley   +1 more source

An Innovative Approach for Gob-Side Entry Retaining With Thick and Hard Roof: A Case Study

Tehnički vjesnik, 2018
An innovative roadway layout in a Chinese colliery based on gob-side entry retaining (GER) with thick and hard roof (THR) was introduced. Suspended roof is left with a large area in GER with THR, which leads to large area roof weighting (LARW). LARW for GER with THR and mechanism of shallow-hole blasting to force roof caving in GER were expounded.
Zhang, Zizheng, Wang, Weijun, Li, Shuqing, Bai, Jianbiao, Hao, Shengpeng, Wu, Hai, Yu, Xianyang   +6 more
openaire   +4 more sources

Safety soft sensor development for pilot‐scale ilmenite electric arc furnace using long short‐term memory‐based architecture

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Ilmenite electric arc furnaces (EAFs) are used for smelting titanium‐iron oxide ore at high temperatures generated by electrical arcs to produce titanium slag and pig iron. As these units are pushed to their limits, ensuring safe and reliable operation becomes challenging.
Antony Gareau‐Lajoie, Djogap F. Chrysler J., Daniel Rodrigues, Marie‐Ève Gosselin, Moncef Chioua   +4 more
wiley   +1 more source

Mine earthquake prevention and control through ground fracturing in deep multi-layered thick roof

Meitan kexue jishu
The presence of multilayered thick and hard roof strata results in frequent mine tremors, significantly complicating prevention and control efforts and posing a formidable challenge to the safe and efficient operation of coal mines.Taking the multi-layer
Jianhong WU, Yongxue XIA, Taotao DU, Gang XU, Xufeng QIN, Jiaming GAO, Yanfei ZHU, Xuehui CHEN, Jinlong ZHOU   +8 more
doaj   +1 more source

Failure characteristics analysis of the inclined interlayer during water‐soluble cavity construction of underground salt caverns for large‐scale energy storage

Deep Underground Science and Engineering, EarlyView.
In the process of water‐soluble cavern construction of salt cavern energy storage, since the interlayer does not dissolve in water easily, sudden collapse will cause engineering accidents such as bending and damage of the inner tube of the cavern.
Zenghui Zhao, Tianyu Li, Qing Ma, Junlong Shang, Jiaze Du, Ruizhe He   +5 more
wiley   +1 more source

Failure characteristics of thick hard roof stratum under hydraulic pre-splitting and its application in a coal mine, Dongsheng mining area

Environmental Earth Sciences
Due to the presence of the hard suspended roof, it cannot collapse naturally after the coal seam is mined. If the roof strata are suddenly destroyed without human intervention, it will cause serious geologic disasters.
Jingzhong Zhu, Wenping Li, Bo Teng, Yu Liu   +3 more
semanticscholar   +1 more source

An optimizing microseismic method for rock burst early warning based on mining production process

Deep Underground Science and Engineering, EarlyView.
A classification early warning method of rock burst based on hourly microseismic data is proposed, which can be combined with the on‐site production process to provide more timely warning. Abstract Microseismic (MS) events have been reported in nearly every coal mining country, which could well lead to rock burst in underground coal mines.
Zepeng Han, Linming Dou, Wu Cai, Mingbo Chi, Guojun Xi, Shuai Chen, Biao Jiao   +6 more
wiley   +1 more source

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

Disaster mechanism of thick-hard roof and control technology by hydraulic fracture with directional long borehole

Meitan kexue jishu
In response to the main technical challenges faced by coal production enterprises in the long-term prevention and control of disasters caused by the thick-hard hanging roof fracturing in longwall mining faces, taking the 8238 fully-mechanized top-caving ...
Zhaozhong LI, Rui WANG
doaj   +1 more source