Geotechnical considerations for concurrent pillar recovery in close-distance multiple seams [0.03%]
近距离多煤层协同回收的岩土工程问题考虑
Peter Zhang,Berk Tulu,Morgan Sears et al.
Peter Zhang et al.
Room-and-pillar mining with pillar recovery has historically been associated with more than 25% of all ground fall fatalities in underground coal mines in the United States. The risk of ground falls during pillar recovery increases in multi...
Applying robust design to study the effects of stratigraphic characteristics on brittle failure and bump potential in a coal mine [0.03%]
稳健设计在研究地层特征对煤矿脆性破坏及冲击地压影响中的应用
Bo-Hyun Kim,Mark K Larson,Heather E Lawson
Bo-Hyun Kim
Bumps and other types of dynamic failure have been a persistent, worldwide problem in the underground coal mining industry, spanning decades. For example, in just five states in the U.S. from 1983 to 2014, there were 388 reportable bumps. D...
Analysis of the design and performance characteristics of pumpable roof supports [0.03%]
泵送式顶板支架设计及性能特点分析
Batchler Timothy
Batchler Timothy
Pumpable roof supports are currently being used to provide a safe working environment for longwall mining. Because different pumpable supports are visually similar and installed fundamentally in the same manner as other supports, there is a...
A practical application of photogrammetry to performing rib characterization measurements in an underground coal mine using a DSLR camera [0.03%]
一种实用的地下煤矿肋柱特征测量方法及其摄影测量DSLRCamera应用研究
Brent A Slaker,Khaled M Mohamed
Brent A Slaker
Understanding coal mine rib behavior is important for inferring pillar loading conditions as well as ensuring the safety of miners who are regularly exposed to ribs. Due to the variability in the geometry of underground openings and ground ...
Ted M Klemetti,Morgan M Sears,Ihsan B Tulu
Ted M Klemetti
Why do some room and pillar retreat panels encounter abnormal conditions? What factors deserve the most consideration during the planning and execution phases of mining and what can be done to mitigate those abnormal conditions when they ar...
A case study of multi-seam coal mine entry stability analysis with strength reduction method [0.03%]
基于强度折减法的多煤层复合巷道稳定性的案例研究
Ihsan Berk Tulu,Gabriel S Esterhuizen,Ted Klemetti et al.
Ihsan Berk Tulu et al.
In this paper, the advantage of using numerical models with the strength reduction method (SRM) to evaluate entry stability in complex multiple-seam conditions is demonstrated. A coal mine under variable topography from the Central Appalach...
Analysis of alternatives for using cable bolts as primary support at two low-seam coal mines [0.03%]
两项低采高的架棚与索榘联合支护对比分析
Gabriel S Esterhuizen,Ihsan B Tulu
Gabriel S Esterhuizen
Cable bolts are sometimes used in low-seam coal mines to provide support in difficult ground conditions. This paper describes cable bolting solutions at two low-seam coal mines in similar ground conditions. Both mines used support systems i...
Analysis of the current rib support practices and techniques in U.S. coal mines [0.03%]
美国煤矿当前的锚网支护技术分析研究报告
Khaled M Mohamed,Michael M Murphy,Heather E Lawson et al.
Khaled M Mohamed et al.
Design of rib support systems in U.S. coal mines is based primarily on local practices and experience. A better understanding of current rib support practices in U.S. coal mines is crucial for developing a sound engineering rib support desi...
David F Gearhart,Mohamed Khaled Morsy
David F Gearhart
Trusses used for roof support in coal mines are constructed of two grouted bolts installed at opposing forty-five degree angles into the roof and a cross member that ties the angled bolts together. The load on the cross member is vertical, ...
Donovan J Benton,Stephen R Iverson,Lewis A Martin et al.
Donovan J Benton et al.
NIOSH ground control safety research program at Spokane, Washington, is exploring applications of photogrammetry to rock mass and support monitoring. This paper describes two ways photogrammetric techniques are being used. First, photogramm...