Search Documents
Search Again
Search Again
Refine Search
Refine Search
-
Ground Control Hazard Analysis In Multi-Seem Mining
By R. Fraher
Hazard analysis utilizes interaction mechanisms in combination with geologic, structural and mining conditions to delineate areas of potential damage in seams subject to interaction. Using characteriz
Jan 1, 1992
-
Deformation Development Around Mine Roadways And Simulation Of Roadway Supports
By E. Yasar
This paper describes the use of the sand and plaster physical modelling technique to investigate the deformation around mine roadways using a variety of support methods in a particular form of stress
Jan 1, 1995
-
Longwall Geomechanics, An Australian Perspective
By Michael Kelly
Longwall mining is the principal method of underground coal mining in Australia, with 70 million tonnes being produced by longwall mines in 1999. However, the mechanisms that control longwall geomecha
Jan 1, 2000
-
Roof Geology Mapping In Underground Coal Mines
By Daniel W. H. Su
Underground roof geology reconnaissance is being conducted by CONSOL Inc. to enhance mine productivity. Often, roof instability within mine entries is the consequence of highly variable geology that c
Jan 1, 1999
-
Pillar Mining And Longwalling Below Massive Roof Strata: Geotechnical Issues And Two Case-Studies In Australia
By Satyendra K. Singh
If the extraction is beneath massive roof strata, the roof tends to 'bridge' across large spans without failing, the caving behaviour is complex and irregular. Understandably, these give ris
Jan 1, 2000
-
Classification Of Mine-Related Subsidence East Of Mississippi River, U.S.A.
By Jesse L. Craft
Field investigation of surface subsidence events associated with both active and abandoned underground coal mines in the United States has established criteria that enable the prediction and classific
Jan 1, 1992
-
Load Transfer Mechanisms In Reinforcing Tendons (59e0902f-c551-42cd-8764-b6dda6eee4b4)
By M. W. Fabjanczyk
Cement and resin encapsulated tendons are widely used in the stabilisation of mine roadways. One of the main factors in controlling the efficiency of the reinforcement is the ability of the tendon to
Jan 1, 1992
-
Interaction Between Roof And Support On Longwall Faces With Particular Reference To Support Resistance
The objective of extensive underground experimentation on three longwall coal faces was to improve the stability of mechanised longwall faces through investigation of the relations between support res
Jan 1, 1984
-
A Case Study Of Grouted Roof Bolt Loading In A Two-Entry Gate Road
By Stephen P. Signer
A field test was conducted by the U.S. Bureau of Mines at the Cyprus Plateau Starpoint No. 2 Mine. near Price. UT. to study the support rock interaction mechanics. Twelve instrumented. fully grouted r
Jan 1, 1990
-
Applications Of Cement Grouting Method For Controlling Weak Strata
By Herryal Z. Anwar
In recent years, many both mining and civil engineering projects are developed in the area which may be categorized unstable, such as fractured and jointed rocks or "water sensitive rocks". For exampl
Jan 1, 2000
-
Strata Support Interaction On A Powered Support Longwall Face Under A Massive Dolerite Sill - A Study (d30e090b-e4dc-4c93-b107-3cdd31db016b)
Design and selection of support systems for longwall faces call for in-depth knowledge of strata mechanics and in particular of strata-support interactions. The paper presents the results of field inv
Jan 1, 1992
-
Analysis of Extensometer Data from a Room Widening Experiment Designed to Induce a Roof Fall
By Dennis R. Dolinar
Roof falls, even of supported roof, still constitute a major hazard in underground mines. However, associated with any fall or instability is a pattern of roof movement. Therefore, the National Instit
Jan 1, 1997
-
Constraint Is The Prime Variable In Pillar Strength
By Clarence O. Babcock
Since Vicat in 1833, the width to height ratio of a mine pillar has been taken as the fundamental variable in pillar design. From work in the laboratory by many investigators testing rock, Coal and co
Jan 1, 1984
-
Modern Shield Technology: Better Than Ever But Still Not Perfect
By Thomas M. Barczak
A survey of the longwall industry was conducted to examine the performance of modern shield technology. The results of this survey indicate that state-of-the-art shields perform better and last longer
Jan 1, 1999
-
Ground Control In South African Coal Mines - A U.S. Perspective
By Christopher Mark
After the United States and Australia, South Africa has the largest. modern underground coal mining industry in the world. Historically, South Africa has been the cradle of many innovations in ground
Jan 1, 1999
-
International Practice in High Performance Underground Thick Coal Seam Extraction and Related Ground Control Challenges
By Bruce K. Hebblewhite
This paper provides an overview of the international ?state of the art? with respect to underground coal mining methods used in seams of thickness greater than 4.5 m, through a review of a selection o
Jan 1, 2013
-
Mining Subsidence Of An Urban Area In Ipswich, Queensland (3581bf43-8b41-4e5e-a797-55082bdbc493)
By D. J. Maconochie
This paper describes the investigations and results of monitoring of deformations of houses located within the area of influence of a pillar collapse over the Westfalen No. 3 coal mine near Ipswich, Q
Jan 1, 1992
-
Assessment of Roadway and Yielding-pillar Performance During Retreat Longwall Extraction at a United Kingdom Deep Mine
By Leigh Sharpe
Dunng the last 5 years a United Kingdom colliery has utilised a yielding-pillar configuration to extract a relatively thick coal seam at a depth of 640 m. As part of ongoing research into the siting o
Jan 1, 1998
-
Investigation Of Seam Thickness And Seam Splitting Within A Longwall Panel By An In-Seam Seismic Survey
By Wolfgang Schott
The propagation velocity of in-seam seismic (ISS ) waves depends on frequency which is also known as dispersion. This dispersion is not only determined by the thickness of the coal seam and its dirt h
Jan 1, 2003
-
Analyses of Valley Fill Slope Stability - Three Case Studies
By Shiva P. B. Kolli
Surface mining of multiple scams by mountaintop mining methodology is complex in the Appalachian region of West Virginia. Excess spoil from the removal of overburden and interburden is disposed in the
Jan 1, 2001