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A comparison between two- and three-dimensional numerical models of a Coeur d'Alene District mine
By T. J. McMahon
This Bureau of Mines study describes the development of a large-scale, three-dimensional, finite-element model of a deep-vein Coeur d?Alene District mine. The three-dimensional model was prepared from
Jan 1, 1989
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The Importance of Underground Stone Mine Roof Geology
By Frank Kendorski
Several startup or longtime underground stone mines have experienced unanticipated roof control difficulties due to the variable geologic character of the roof strata. Careful mapping of roof conditio
Jan 1, 2002
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Investigation of Fully Grouted Roof Bolts Installed Under In Situ Conditions (8fabb507-7dbd-4e7d-b9c9-518c3be86281)
By Craig Compton
The The National Institute for Occupational Safety ane Health (NIOSH) Pittsburgh Research Laboratory (PRL) is continuing to investigate the behavior of fully grouted roof bolts in the weak roof rock o
Jan 1, 2005
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Tailgate Support Practice In U.S. Longwall Mines - A Survey
By S. S. Peng
To acquire knowledge on the general trend of primary and supplemental supports used in tailgates of US longwall mines a survey of 76 mines with 86 longwall panels was carried out in the summer of 1993
Jan 1, 1994
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Development and Testing of a New Roof Prop
By E. Bane Kroeger
In underground coal mining, there is often a need for supplemental support for mine openings. In the past, one of the most common types of supplemental support was wooden posts that were installed aga
Jan 1, 2005
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Basics on the Dimensioning and the Extraction of Shaft Safety Zones
By Anton Sroka
The dimensioning of shaft safety zones is a substantial task of mining subsidence engineering. On the one hand, the coal reserves in shaft proximity are to be mined as complete as possible, because th
Jan 1, 2005
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The Use of the Area of Main Influence to Fix a Relevant Boundary for Mining Damages in Germany
By Denise Mueller, Axel Preusse
"In 2010, the fracking discussion in Germany caused a number of changes in German law, which came into force in 2016. Especially the production of gas had to be regulated. With the legislation amendme
Jan 1, 2017
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Determination Of Limitation Of Roof Layer Separation (LRLS) In Entry Roof
By Wenjun Ju
It's very important to determine the limitation of bed separation in entry roof in order to predict roofs stability and take some necessary precautions. Based on numerical modeling and monitoring
Jan 1, 2001
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A Comparison of Numerical Methods and Analytical Methods in Determination of Tunnel Walls Displacement ? A Case Study
By Behdeen Oraee-Mirzamani
Tunnel stability has an important role in the production process of an underground coal mine. There are various methods for analysing tunnel stability, such as numerical methods and analytical methods
Jan 1, 2013
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Challenges in German Subsidence Research—Retrospectives and Perspectives
By Denise Müller, Axel Preusse
"Due to multilateral underground use, mining subsidence is discussed more and more with regard to issues other than mining, such as post-mining topics, storage, or geothermal use. These discussions an
Jan 1, 2018
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Seam Structure - An Important Criterion for Coal Pillar Design
By Kot F. v. Unrug
In spite of the extensive research and accumulated experience from mining operations, an appropriate pillar design remains an open issue. Due to the shrinking reserve base, present mining operations m
Jan 1, 2005
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Overburden Failure Characteristics of Extra?Thick Seam Using Top Coal Caving Mining Method at Tongxin Coal Mine
By Zhijie Zhu
In order to determine the overburden failure characteristics of extra-thick seam mining, EH4 electromagnetic image system and borehole televiewer survey were applied to panel 8100, Tongxin coal mine.
Jan 1, 2014
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Development of a Laboratory Facility for Testing Shear Performance of Installed Rock Reinforcement Tendons
By L. Mahony
This paper describes the design, construction and commissioning testing program for a laboratory facility at the School of Mining Engineering, UNSW, Australia, aimed at evaluating reinforcement tendon
Jan 1, 2005
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Comparison Of Multiple And Single Entry Roadways For Highly Stressed Longwalls
By Klaus Opolony
The world's most popular method of longwall mining requires multiple entry systems for the panels. In contrast to this mine layout the roadways in German coal mining are used for advanced mining
Jan 1, 2003
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Assessing Coal Bumps From Excess Energy in Finite Difference Models
By Ryan Garvey
A numerical investigation is made into unstable failures of coal pillars (i.e. coal bumps) using the finite difference software FLAC3D. A static energy balance is first derived to calculate the excess
Jan 1, 2013
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Mechanisms of Rib Sloughing and Methods of Controlling Thick Bolted Ribs
By Shuangsuo Yang
Coal ribs can roughly be divided into three types: (1) roof and floor rocks are similar to ribs, (2) roof and floor rocks are stronger than ribs, and (3) roof and floor rocks are weaker than ribs. Dif
Jan 1, 2005
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A Method for Quantitative Void/Fracture Detection and Estimation of Rock Strength for Underground Mine Roof
By Syd Peng
In designing a proper roof support system, one must know the features of roof geology in advance of mining. The drilling parameters obtained during normal roof bolt installation cycle can provide a l
Jan 1, 2005
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Stability Mapping System
By Quanxi Wang
This paper presents a new stability mapping system which tightly integrates structural and geologic mapping with geo- mechanical stress analysis for use in support design and mine plan- ning. The stru
Jan 1, 2005
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Assessment of Ground Conditions Near a Mine Portal Using Ground Penetrating Radar
By Michael Trevits
The NIOSH Lake Lynn Laboratory (LLL) is a unique research facility, located about 50 miles southeast of Pittsburgh, Pennsylvania, that is designed to provide a full-scale mining environment for testin
Jan 1, 2005
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Modeling the Arc-effect of a Coal Mine Roof
By André C. Zingano
The domino effect in a violent pillar collapse occurs due to the redistribution of stress in the remaining pillars near the collapse, and this stress transfer occurs in the immediate and main roofs. T
Jan 1, 2005