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Influence Of Discontinuity Orientations And Strength On Cavability In A Confined Environment
By L. J. Lorig
Much of the present knowledge about caving behavior of rock masses has been obtained from empirical observations. Additional notions about caving have been developed through inferences derived from tw
Jan 1, 1989
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Laboratory Pull Tests Of Resin-Grouted Cable Bolts
By Lewis Martin
Spokane Research Center personnel are currently conducting research on cable bolts to assess their material and support properties, to provide design criteria for roof control systems under various ty
Jan 1, 1996
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Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
By Gabriel Esterhuizen
Observations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage at stresses that are lower than one would otherwise expect. Th
Jan 1, 2007
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Development of Mains in Challenging Ground Conditions
By Kot F. v. Unrug
The present combination of coal market prices and reserves, situated in the Central Appalachian Coal Field, is such that mining of smaller coal reserve blocks has become economically attractive. In
Jan 1, 2006
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Estimation Of Long-Term Stability Of Mine Pillars In Underground Pit
By S. Yamashita
Recently in Japan, unexpected degradation (surface subsidence) at old underground quarry sites, such as 'Ohya-Ishi' (pumice tuff) pit field has often been occurred. At these quarry sites, th
Jan 1, 1996
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Innovative Secondary Support Technologies For Western Mines
By Thomas M. Barczak
With the development of the shield support, the primary requirement for successful ground control in longwall mining is to provide stable gate road and bleeder entries. Wood cribbing has been the domi
Jan 1, 1996
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An Integrated Approach To Subsidence Modelling And Prediction In The Collie Coal Basin (Western Australia)
By Ian Misich
A research programme has been undertaken to evaluate and predict the effect of total extraction of coal by underground methods on the superimposed strata, aquifer systems and ground surface in the Col
Jan 1, 1993
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Geostatistical Methods For Hazard Assessment And Site Characterization In Mining
By Jennifer Riefenberg
Ground control hazards, coal quality, ore reserve estimation, and pollution modeling seem unrelated topics from most mining perspectives. However, geostatistical methods can be used to characterize ea
Jan 1, 1996
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Characteristics of Coal Bursts in the North Fork Valley of the Gunnison River Valley, Colorado
By Christopher Mark
A coal burst is defined as the sudden, violent ejection of coal or rock into a mine opening. Coal mines in the North Fork Valley (NFV) of Colorado?s Gunnison River have a long history of coal bursts i
Jan 1, 2012
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Investigation of Some Alternatives to Timber Posts and Cribs
By Gavin J. Faulkner
This paper presents an investigation of some alternatives, and improvements to timber posts and cribs. The purpose is to find a cheaper, better, easy to install, and effective means to replace or impr
Jan 1, 1986
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Two Case Studies Of The Performance Of Rib Supports
By M. K. Larson
The U.S. Bureau of Mines conducted a study to evaluate support interaction between conventional bolts and the rib at two Western coal mines. The principal goal was to develop guidelines for designing
Jan 1, 1996
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Coupon Testing for Field Assessment of Stress Corrosion Cracking of Rock Bolts
By Damon P. Vandermaat
Coupon testing allows for the rapid understanding of a material?s likely behavior in service conditions, allowing engineers and operators to make informed decisions about the likely service-life of pa
Jan 1, 2012
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Rock Mechanics Issues In The Trona Patch
By Archie Richardson
The trona mines in the Green River Basin, commonly known as the "trona patch," present an interesting set of rock mechanics issues stemming from mining in a unique underground environment. Like other
Jan 1, 1999
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Footwall Stability and Final Pit Design in the PT. Adaro Coal Mine, Indonesia
By Takashi Sasaoka
The PT. Adaro Coal Mine targeted in this research is located in South Kalimantan, Indonesia. The coal production of this mine is increasing year, with about 35 M tons of coal produced in 2006. Th
Jan 1, 2008
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Regularities Of Rock Pressure Manifestations In Longwalls In Terms Of The Theory Of Plates And Limit Equilibrium
By V. M. Shick
With gentle bedding within the zone of support pressure the delamination in roof rocks may occur only on those stratification planes where cohesiveness of rock is close to zero. Unlike this, at dip an
Jan 1, 1996
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Evaluation Of Polyurethane Injection For Beltway Roof Stabilization In A West Virginia Coal Mine (4376a6c8-d15e-4751-9754-663f60fbf3a4)
By Gregory Molinda
Extremely difficult ground conditions were encountered in the main belt entry in a room and pillar mine in West Virginia. Several generations of supplemental support, including cable bolts, cribbing,
Jan 1, 2004
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High Horizontal Movements In Longwall Gate Roads Controlled By Cable Support Systems
By Dennis R. Dolinar
Controlling coal mine roofs subjected to high-horizontal stress conditions has always been difficult and uncertain. Traditional supports such as wooden cribs and posts, concrete donut cribs, and stand
Jan 1, 1996
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Complex Seismic Trace Attributes In Coal Exploration
By Lawrence M. Gochioco
The interpretation of coal seismic data requires a certain precision and accuracy to make the results more reliable. The signature of the seismic wavelet provides a host of valuable geologic informati
Jan 1, 1989
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The Unpredictable Life Cycle of a Coal Pillar (b2bcadc5-82a3-454e-be3a-6b79e9867244)
By Stephen Tadolini
A unique circumstance created by monitoring a pre-driven longwall recovery room permitted measuring the stresses of a coal pillar throughout its entire life cycle in less than a week. A fender pillar
Jan 1, 2007
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Problems And Prospects Of Roof Bolting Development At Cuzbass Region Mines
By V. Eu. Anufriev
Despite of significant cost advantages and the positive expierence roof bolting is limited up to 15-20% of all workings at the Cuzbass mines. The low level of application of the technology is the re
Jan 1, 1996