Search Documents
Search Again
Search Again
Refine Search
Refine Search
-
A Comparison Of Overburden Response Due To Longwall Mining
By David K. Ingram
The objective of this U.S. Bureau of Mines (USBM) investigation was to characterize overburden response due to longwall mining. Subsurface strata and surface deformations were monitored at two sites i
Jan 1, 1994
-
Alternatives For Controlling Cutter Roof In Coal Mines
By Nicholas P. Kripakov
The unpredictable massive collapse of roof in openings developed under apparently safe and stable roof conditions in coal mines of the United States has been of much concern for many years. One type o
Jan 1, 1982
-
The Potential of Acoustic Emissions from Three Point Bending Tests as Rock Failure Precursors
By Filippo Vallianatos, Michael Verigakis, Vasili Saltas, Kosta Kaklis, Stelio Mavrigiannakis, Zach Agioutantis
"Development of failure in brittle materials is associated with microcracks, which release energy in the form of elastic waves called acoustic emissions. This paper presents results from acoustic emis
Jan 1, 2015
-
Remote Sensing Techniques In Mine Planning - Applications And Limitations
By D. E. Winston
Roof falls are the major cause of fatalities in the, coal mining industry and the prevention of roof failure is a major concern of mine management. Many ground failures observed underground are associ
Jan 1, 1982
-
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
-
Laboratory Investigation of Confinement-Dependent Mechanical Behavior of a Utah Coal
By Bo-Hyun Kim, Steve Berry, Mark K. Larson
"When coal pillar bursts occur, they involve the sudden expulsion of coal and rock into the mine opening. These events occur when relatively high stresses in a coal pillar, which serve as support in u
Jan 1, 2018
-
Strata Movement Around Large Mining Height Face Area with Fully Mechanized Method in Steeply Dipping Thick Seam
By Yongping Wu
The steeply dipping coal seams in this paper refer to those with the angle of inclination ranging from 35° to 55°. The reserves of the steep coal seams account for approximately 15%~20% of the total c
Jan 1, 2014
-
Analysis of Coal Pillar Stability (ACPS): A New Generation of Pillar Design Software
By Zach Agioutantis, Christopher Mark
"Thirty years ago, the Analysis of Longwall Pillar Stability (ALPS) inaugurated a new era in coal pillar design. ALPS was the first empirical pillar design technique to consider the abutment loads tha
Jan 1, 2018
-
Think Like a Rock
By Tom Barczak
Early in my career, while giving a presentation on shield design for longwall mining at one of the International Conferences on Ground Control in Mining, the late Jim Scott told me that I was finally
Jan 1, 2011
-
Ground Deformation In The Case Of Underground Mining Of Thick And Dip Coal Seams In The Jiu Valley Basin
By Gheorghe Oncioiu
The phenomena developed on the influence of thick coal seam no.3 mining, by horizontal slices and rocks caving roof control, in the Jiu Valley coal basin, are very complex. By analyzing the influence
Jan 1, 1999
-
Spatial Trends In Rock Strength - Can They Be Determined From Coreholes? (51393e91-3e75-4a8d-ac36-e107a993fe35)
By Christopher Mark
Mine planning for a new reserve is based on information obtained from exploratory coreholes. A critical component of an exploration program is the geotechnical evaluation. Poor assumptions about roof
Jan 1, 2004
-
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
-
The Influence Of Certain Geologic And Geotechnical Factors On Coal Mine Floor Stability - A Case Study - Introduction
By Robert C. Speck
Floor heave or deformation of the mine floor into the mine opening is a problem which has plagued coal mines in this country and others. In mining areas where room and pillar mining is practiced, floo
Jan 1, 1981
-
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
-
Development Of A Subsidence Database And Determination Of Subsidence Parameters
By Syd S. Peng
A total of 209 cases of subsidence data over longwall panels in 16 US coal seems have been collected and built into a subsidence database. The database is developed under MS Windows environment. It us
Jan 1, 1995
-
Numerical Modeling of the Gob Loading Mechanism in Longwall Coal Mines
By Khaled Morsy
Longwall mining is one of the most widely practiced underground coal mining method. The behavior of the longwall gob is very critical in the understanding of the complex ground response to longwall mi
Jan 1, 2002
-
Seismic Events Due To Underground Mining Activities
By R. Fritschen
In order to investigate locations, source parameters, and source mechanisms of mining induced seismic events, a local network of seismic stations was installed at a coal mine in the eastern part of th
Jan 1, 1999
-
In Situ Strength Testing of Rocks with the Borehole Penetrometer
By Kot F. von Unrug
One of the major difficulties in the proper characterization of rocks surrounding excavations is the lack of data. The existing method for strength determination requires core drilling for sample coll
Jan 1, 1998
-
Design Considerations for Tensioned Bolts
By Yunqing Zhang
The 3-D numerical modeling using ABAQUS is performed to analyze the mechanisms of the tensioned bolts by taking into considerations excavation sequence, pre-tension, bedding planes and in-situ horizon
Jan 1, 2002
-
Influence Of Partings In A Coal Seam On Long Term Pillar Stability
By K. Biswas
So far, all pillar design methods or approaches consider the coal seam as a uniform structure From some mine visits in northern Appalachian Region. it is found that some coal seams have binder or part
Jan 1, 1995