Floor dust erosion during early stages of coal dust explosion development [0.03%]
煤尘爆炸发展初期的地面粉尘侵蚀现象研究
Marcia L Harris,Michael J Sapko
Marcia L Harris
An ignition of methane and air can generate enough air flow to raise mixtures of combustible coal and rock dust. The expanding high temperature combustion products ignite the suspended dust mixture and will continue to propagate following t...
A field study of a roof bolter canopy air curtain (2nd generation) for respirable coal mine dust control [0.03%]
一种煤矿呼吸性粉尘控制巷道式机载喷雾装置现场实验研究（第二代）
W R Reed,S Klima,M Shahan et al.
W R Reed et al.
A 2nd generation roof bolter canopy air curtain (CAC) design was tested by National Institute for Occupational Safety and Health (NIOSH) at a Midwestern underground coal mine. During the study, the roof bolter never operated downwind of the...
Development of a fault-rupture environment in 3D: A numerical tool for examining the mechanical impact of a fault on underground excavations [0.03%]
三维断层破裂演化数值工具的研究进展及其对地下工程影响的分析方法
Bo-Hyun Kim,Mark K Larson
Bo-Hyun Kim
While faults are commonly simulated as a single planar or non-planar interface for a safety or stability analysis in underground mining excavation, the real 3D structure of a fault is often very complex, with different branches that reactiv...
Ground response to high horizontal stresses during longwall retreat and its implications for longwall headgate support [0.03%]
采空区暴露引起的高地应力及其对综放工作面头门支护的启示
Peter Zhang,Dave Gearhart,Mark Van Dyke et al.
Peter Zhang et al.
Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress...
I B Tulu,G S Esterhuizen,D Gearhart et al.
I B Tulu et al.
A numerical-model-based approach was recently developed for estimating the changes in both the horizontal and vertical loading conditions induced by an approaching longwall face. In this approach, a systematic procedure is used to estimate ...
Ted M Klemetti,Mark Alexander Van Dyke,Ihsan Berk Tulu
Ted M Klemetti
Several questions have emerged in relation to deep cover bleeder entry performance and support loading: how well do current modeling procedures calculate the rear abutment extent and loading? Does an improved understanding of the rear abutm...
Mingming Li,Thomas Dubaniewicz,Heather Dougherty et al.
Mingming Li et al.
This report presents the results of experiments to evaluate a prototype fiber optic methane monitor exposed to smoke using a smoke chamber to simulate atmospheric conditions in an underground coal mine after a fire or explosion. The experim...
Evaluation of seismic potential in a longwall mine with massive sandstone roof under deep overburden [0.03%]
深覆盖层大型砂岩顶板综放工作面冲击地压评价研究
Mark A Van Dyke,Wen H Su,Joe Wickline
Mark A Van Dyke
A recent seismic event was recorded by a deep longwall mine in Virginia at 3.7 ML on the local magnitude scale and 3.4 MMS by the United States Geological Survey (USGS) in 2016. Further investigations by the National Institute for Occupatio...
Morgan M Sears,John Rusnak,Mark Van Dyke et al.
Morgan M Sears et al.
In 2016, room-and-pillar mining provided nearly 40% of underground coal production in the United States. Over the past decade, rib falls have resulted in 12 fatalities, representing 28% of the ground fall fatalities in U.S. underground coal...
Analysis of monitored ground support and rock mass response in a longwall tailgate entry [0.03%]
长壁尾采区巷道实测支护与围岩响应分析
G S Esterhuizen,D F Gearhart,I B Tulu
G S Esterhuizen
A comprehensive monitoring program was conducted to measure the rock mass displacements, support response, and stress changes at a longwall tailgate entry in West Virginia. Monitoring was initiated a few days after development of the gatero...