Results 101 to 110 of about 73,550 (313)

Study on the effect of mining height on overburden strata movement in longwall mining

International Journal of Coal Science & Technology
The mining height of a coal seam is a critical factor influencing the detachment, collapse, and formation of the collapse angle of the strata during strata movement. To clarify the mechanism by which mining height affects strata movement characteristics,
Ying Ma, Qunying Wu, Jinhong Yang, Fuqiang Gao, Jinfu Lou, Bingwei He, Jianzhong Li   +6 more
doaj   +1 more source

Canaries in the Coal Mine

Professional Case Management, 2021
openaire   +3 more sources

Coal operator mining facts - 2008 [PDF]

"Mining Operations: In 2008, a total of 2,129 coal mining operations reported employment to the Mine Safety and Health Administration (MSHA). Coal mines comprised 14.3% of all mining operations. 1.

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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

Relationships among tissues, biofluids, and otolith selenium concentrations in wild female burbot (Lota lota)

Integrated Environmental Assessment and Management, EarlyView., 2023
Abstract In the Lake Koocanusa‐Kootenai River system (Montana, USA and British Columbia, Canada), selenium (Se) contamination has become an international concern and is suspected to contribute to the observed burbot (Lota lota) population collapse. Due to our limited ability to sample burbot in Lake Koocanusa for monitoring studies, we used a reference
Stephanie D. Graves, Noëlie Molbert, David M. Janz, Lauren D. Hayhurst, Jessica E. Brandt, Lauren Timlick, Vince P. Palace   +6 more
wiley   +1 more source

Impact resistance performance of rockbolt system with(out) rubber cushion energy absorbing and buffering components

Meitan xuebao
The practice of impact resistance support in dangerous roadways has shown that energy absorbing and buffering components can improve the impact resistance performance of rockbolt support systems. A rubber cushion layer was used as an energy absorbing and
Zhiguo LU, Fuqiang GAO, Jinfu LOU, Shuangyong DONG, Xiangyuan PENG, Gang BAI, Xiaoqing WANG, Lei YANG, Yukai FU   +8 more
doaj   +1 more source

Semi‐analytical solution for the stability of deep vertical shaft considering time‐dependent rock‐structure interaction

Deep Underground Science and Engineering, EarlyView.
A novel cavity contraction solution and multilayer shaft wall model were developed to analyze deep shaft stability, considering rock viscosity, support structures, and water pressure, with successful validation through a Hulusu Coal Mine case study.
Bin Chen, Pinqiang Mo, Zhao Lu, Lianfei Kuang, Qiang Zhang, Abolfazl Eslami   +5 more
wiley   +1 more source

Study and application of dynamic response characteristics of support in full-mechanized top coal caving with large mining height

Meitan xuebao
The dynamic response characteristics of stope support include the information of support resistance increase and live column shrinkage, which is not only an important index to reflect the strength of mining pressure behavior in working face, but also the
Xingyu LIN, Gang XU, Zhen ZHANG, Xiaojin GAO, Xiaogang LIU, Qianjin LIU   +5 more
doaj   +1 more source

Coal operator mining facts - 2002 [PDF]

"In 2002, a total of 2,065 coal mining operations reported employment to the Mine Safety and Health Administration (MSHA). Coal mines comprised 14.2% of all mining operations. A total of 74,559 employees, corresponding to 78,601 full-time equivalent (FTE)

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Caving‐enhanced geothermal system overwhelms fracturing‐ and pipe‐enhanced geothermal system in heat extraction

Deep Underground Science and Engineering, EarlyView.
Our study reveals that caving‐enhanced geothermal systems (C‐EGS) with adequately fractured reservoirs achieve optimal heat extraction by minimizing preferential flow paths, while conventional fracturing (F‐EGS) and pipe‐based (P‐EGS) systems suffer accelerated thermal drawdown.
Fangchao Kang, Tianjiao Li, Yingchun Li, Jinlong Men, Chun'an Tang   +4 more
wiley   +1 more source