Results 121 to 130 of about 73,550 (313)

Instability mechanism and failure characteristics of underground cavern in block system under the action of seismic waves

Deep Underground Science and Engineering, EarlyView.
Seismic waves with tensile stress, high amplitude, and low frequency are most likely to trigger block instability and sliding. Blocks with a single sliding surface are more prone to movement than those with multiple constraints, and roof‐positioned blocks are especially vulnerable to slide.
Xiao Wang, Jinxiao Liu, Gaoshuo Zhang, Wenxin Li, Changdi He   +4 more
wiley   +1 more source

Coal roadway rapid driving technology and equipment with integrated drilling and anchoring and its application

Meitan xuebao
This paper analyzes the current situation and existing problems of coal roadway driving technologies and equipment, introduces the new mode, technology, equipment of coal roadway rapid driving with integrated drilling and anchoring and its underground ...
Hongpu KANG, Pengfei JIANG, Ziyue WANG, Xiaofeng ZHANG, Chang LIU, Chao LUO, Yaozhong WEI, Jichang GUO, Zhiliang CHEN, Rui WANG, Cundi HAN, Faquan LI, Zongke HE, Chao SU   +13 more
doaj   +1 more source

Satyagraha on Natal's Coal Mines

Journal of Natal and Zulu History, 2013
The Satyagraha campaign of 1913 was the first mass protest by Indians in South Africa. Well over 20,000 men, women and children participated in the struggle against discriminatory measures. Defiance took several forms: individual acts of hawking without a licence, defying immigration laws, and protests on the coal mines.
openaire   +1 more source

Coal and metal/nonmetal mining facts - 2008 [PDF]

"Mining Operations: Data obtained from the Mine Safety and Health Administration (MSHA) indicated 2,129 active coal (14.3%) and 12,778 metal/nonmetal (85.7%) mining operations. 1. There were 26 states reporting coal mining operations.

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Modeling and experimental validation of bolt–grout bond–slip behavior for deep underground excavation support

Deep Underground Science and Engineering, EarlyView.
A novel shear‐lag model, validated by pull‐out tests, incorporates a constant bond stress stage to predict the complete load–displacement response of grouted rock bolts, providing a new tool for optimizing anchorage length and material toughness in deep underground engineering. Abstract The stability of rock masses in deep underground excavations, such
Wenhui Bian, Xiaohui He, Kexue Wang, Yufei Wu, Guoxin Wang, Shaochen Zhang, Jun Yang   +6 more
wiley   +1 more source

Coal utilization study

, 1988
"October, 1988."EXECUTIVE SUMMARY -- BASIS FOR THE STUDY -- THE KANSAS COAL MINING INDUSTRY -- UTILITY COAL MARKET IN KANSAS -- INDUSTRIAL COAL MARKET -- COMMERCIAL, RESIDENTIAL, EXPORT POTENTIAL -- COMPETITIVE ANALYSIS -- THE OUTLOOK FOR KANSAS COAL ...
J.E. Sinor Consultants, Inc.
core   +1 more source

Mechanical behavior and failure mechanisms of rock bolts subjected to static-dynamic loads

International Journal of Mining Science and Technology
This study explores the effects of dynamic and static loading on rock bolt performance a key factor in maintaining the structural safety of coal mine roadways susceptible to coal bursts.
Hongpu Kang, Guiyang Yuan, Linpo Si, Fuqiang Gao, Jinfu Lou, Jinghe Yang, Shuangyong Dong   +6 more
doaj   +1 more source

Field studies for key stage 4 on mine water pollution: a university and museum collaboration

, 2013
This article describes how a university and a museum have worked together to create a ‘How science works’ workshop entitled ‘What’s in our water?’ The workshop teaches students about the continuing pollution from a disused coal mine, how the pollution is
Berry, Stuart, Hopwood, Jeremy D., National Coal Mining Museum for England, University of Huddersfield, Ambrose, Jayne   +4 more
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Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

Deep Underground Science and Engineering, EarlyView.
Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Organized Labor and Restructuring: Coal Mining in the Czech Republic and Romania (in English) [PDF]

The authors examine the role of organized labor in the restructuring experience of two coal-mining regions in the Czech Republic and Romania in the 1990s.
Delia Ionascu, Byeongju Jeong, Jan Bruha
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