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Design Considerations of the Secondary Roof Support for Longwall Tailgate Entries
By Jinsheng Chen
To maintain the stability of longwall tailgate entries, they have to be supported by not only the primary roof support but also the secondary roof support due to the impact of the longwall mining¬indu
Jan 1, 2003
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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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Time Dependent Strength Of Coal Strata For Long-Term Pillar Stability
By Z. T. Bieniawski
A major study was performed on determination of long term strength of coal strata directed to the design of coal pillars to ensure their stability beyond the life-time of a mine. Based on field invest
Jan 1, 1994
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A Novel System For Automatic Installation Of Cement Grouted Roof Bolts
By A. Mahyera
BETTER ROOF SUPPORT During the last decade, resin-grouted roof bolts have taken a substantial foothold in the coal mining industry - now accounting for about one-third of all bolts installed annual
Jan 1, 1984
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Theory and Technology of Mining Subsidence Control by Grouting the Overlying Strata Separations with Fine-Coal Ash
By Yanfa Gao
Abstract In order to control and reduce ground subsidence due to coal mining, and to protect building, railway and other surface construction, a new subsidence control method is proposed. Ground subsi
Jan 1, 2002
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Tracking and Tracing in Terms of Transportation Logistics of Hard Coal Mines
By Marcel0 Mondring
Transportation and the logistic requirements are set very high for the German coal mining industry. Short transportation resources, crowded quarters, and long transportation distances to destinations
Jan 1, 2014
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Determination Of The Rock Strength From Portable Rock Tester
By K. F. Unrug
A new testing technique for the determination of the rock strength from portable rock tester is proposed. It is a quick and economical method that can determine the rock strength with reasonable accur
Jan 1, 1990
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Experience of Using the ANZI Strain Cell for Three-Dimensional, In Situ Stress Determinations in Deep Exploration Boreholes
By Jesse Puller, Ken Mills
"This paper describes the Australia, New Zealand Inflatable (ANZI) strain cell, its operation, and recent development for overcoring in exploration boreholes. The ANZI strain cell is an instrument sys
Jan 1, 2018
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Polymer Membrane Liners In Underground Coal Mines - Ground Control For The Millenium?
By David C. Laurence
in March 1999, the School of Mining Engineering at the University of New South Wales carried out a series of underground trials using " Evermine", a South African developed two-part water based polyme
Jan 1, 2000
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RYBAD Empirical Field Model For Prediction Of Maximum Land Subsidence Associated With Longwall Coal Mining
By Thomas Rymer
Mathematical modelling of mine subsidence measured at 21 locations in Pennsylvania and northern West Virginia allows for the refinement of current methods of predicting maximum land subsidence associa
Jan 1, 1988
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Characterization of Tensile and Shear Loading on Smooth and Indented Wires and PC–strand Cable Bolts
By Steven Derycke, Stephen C. Tadolini, Anand Bhagwat
"The tensile and shear strength of intrinsic bolting support systems has always been a major concern of designers. A comprehensive laboratory testing program was designed to evaluate the tensile and s
Jan 1, 2015
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A Study of Periodic Weighting of Longwall Supports
By Archie Richardson
Periodic weighting of longwall supports occurs during retreat ofthe face under certain geologic conditions. Strong stratain the immediate and main roof tend to cantilever over the gob, weighting the s
Jan 1, 1998
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Multi-Scale Assessment Of Coal And Gas Outbursts Based On Fractal Measurements
By Mingju Liu
In this research, we measured fractal characteristics of over ten typical outburst areas on different scales and related them to their outburst proneness, in attempts to provide new methods for outbur
Jan 1, 2000
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Dynamic Failure in Coal Seams: Implications of Coal Composition for Bump Susceptibility
By Arthur Miller, Andrew Weakley, Heather E. Lawson
"IntroductionDynamic failure events in an underground coal mine, or “bumps,” are defined as “the sudden, violent bursts of coal from a pillar or pillars or a block of coal, resulting in a section, the
Jan 1, 2015
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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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Design Considerations For Cable Truss Secondary Supports In Roadways Of Underground Collieries
The purpose and current practice of cable trusses in underground coal mines is briefly outlined and details of various cable truss designs are presented. The main part of the paper describes the in-si
Jan 1, 1992
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A Method To Determine Expander Spacing For Steel Pipelines In Mining Districts
By Axel Preusse
In the Ruhr district, pipelines of public and private infrastructure are made of cast iron, steel, plastics or asbestos cement. Legal framework, technical regulations and normative standards define wh
Jan 1, 2004
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Study On The High-Pressure Grouting Of The Overburden For Subsidence Control
By W. J. Guo
Overburden movement as a result of longwall mining can be classified into, in ascending order, caving zone, fractured zone, and bending zone. Operation experience and laboratory research have demonstr
Jan 1, 1994
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An Examination Of Energy Calculations Applied To Coal Bump Prediction
By Keith A. Heasley
Pillar recovery in deep coal mines with competent roof and floor can concentrate stresses and generate hazardous bumps. Actual calculation of the geologic strain energy released in association with th
Jan 1, 1990
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The Design of Primary Ground Support during Roadway Development Using Empirical Databases
By Ry Stone
"There have been many design practices utilised within the coal mining industry to arrive at the minimum densities of primary ground support required during roadway development. This paper demonstrate
Jan 1, 2015