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Improving the Capability for Real Time Assessment of Roof Conditions through Intelligent Roof Bolt Drilling Operations,
By Robert Anderson
Advance knowledge of roof conditions can lead to improvement in roof control strategies that will reduce roof falls and ultimately will reduce injuries to mine workers. J.H. Fletcher and Company, in
Jan 1, 2007
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Stability of Slopes in Discontinuously Jointed Rock (4d3fd7d1-f3a8-44f5-b86c-03d96a9b1123)
By T. M. Tharp
Attempts to analyze the stability of slopes, foundations and underground openings in discontinuously jointed rock have generally assumed full joint continuity or ignored the role of stress concentrati
Jan 1, 1984
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In-Situ Tests and Numerical Simulation about the Effect of Annulus Thickness on the Resin Mixture for Fully Grouted Resin Bolt
By Andre Zingano
The objective of this paper is to study the effect of annulus thickness on the quality of resin mixture for fully grouted resin bolt. Pullout and mixture tests were made in underground coal mines for
Jan 1, 2008
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The Use of Strata Management Techniques for the Optimisation of Secondary Support in Longwall Installation Roadways at United Colliery, NSW, Australia
By Kieran Black
The immediate roof lithology at United Colliery is extremely variable and provides a challenge for the design of secondary support. Support design in recent longwall installation roads at the mine has
Jan 1, 2007
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Convergence Characteristics of the Rocks Surrounding the Tailgate Supported with Roof Bolts in the Fault-Affected Zone
By Xinxian Zhai
Jining No. 3 Coal Mine, a subsidiary of Yanzhou Coal Company Limited. China, is a super-large modern mine. The coal mine is not only the first one constructed with five-million tons of designed produc
Jan 1, 2007
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25 Years of Progressive in Numerical Modeling for Ground Control ? What Have We Accomplished and Where Do We Go Next?
By Keith A. Heasley
Exactly 25 years ago this month (August 12, 1981), IBM introduced the ?Personnel Computer? with a 16 bit operating system called MS-DOS 1.0. Since then, Moore?s Law, which essentially states that
Jan 1, 2006
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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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Application of Electrohydrodynamic Method and High-Pressure Water Jets as Non-Blasting Alternative of Rock Breaking and Splitting in Open Pits
By Krzysztof Kotwica
The steady demand for rock materials leads not only to on increase in mining but to the need for decreasing the loss of material in the process of exploitation as well. It brings about an increase in
Jan 1, 2006
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Effect of Faults on the Movement of Roof Strata in Gateroads
By Panfeng Gou
In order to solve the problems of supporting the roof of the gateroads affected by a fault, the movement characteristics of roof strata must be fully understood. In this paper, a plane stress physical
Jan 1, 2006
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Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
By Tara Bajpayee
Modern, highly productive underground mining operations need to assure the safety of their workforce by understanding where major strata fractures and roof failures could occur. Mines depend on a hos
Jan 1, 2008
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Post?Collapse Seismicity of the Crandall Canyon Mine Using Double Difference Relocations
By Tex M. Kubacki
In 2007, the University of Utah Seismograph Stations (UUSS) temporarily expanded its seismic monitoring network in Emery County, Utah, in response to the August 6 Crandall Canyon mine collapse that tr
Jan 1, 2012
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J?Crete: An Engineered Cementitious Composite Rock Coating
By Alan A. Campoli
The mining industry has long been searching for an effective structural application that prevents weathering and falls of loose rock, debris, and sediment. J-Crete is a fiber-reinforced, engineered, c
Jan 1, 2012
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Overmining In Kailuan, China Mining Area (d9eb7d79-18c1-4a77-a59a-53706a90764b)
By Jun Han
Coal has been mined in the Kailuan mining area for more than 130 years. The remaining reserves consist of, in large part, coals that would have been considered economically unminable or technically no
Jan 1, 2009
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Weak Floor Stability During Perimeter Mining In The Illinois Basin Coal Mines (40fab914-2257-4efe-b587-9358b9303f41)
By Murali M. Gadde
Perimeter mining is a special form of very productive partial extraction method practiced at some mines in the United States. In the Illinois Basin mines where all major coal seams have weak underclay
Jan 1, 2009
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Developments of a Prototype Borehole Profilometer to Estimate Roof-Bolt Anchorage Capacity from Borehole Roughness Measurements-Laboratory Tests
By Mark K. Larson
Researchers at the National Institute for Occupational Safety and Health?s (NIOSH) Spokane Research Laboratory are developing a borehole profilometer to dynamically measure the roughness pro-file of b
Jan 1, 2007
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Field Experience Of Measuring The Acoustic Energy From A Hammer Blow To Coal Mine Roof And Its Relationship To Roof Stability
By Peter Altounyan
The rate of decay of the energy from a hammer blow to a coal mine roof is related to the size and nature of the contacts between the rock being struck and its surroundings The use of this principle as
Jan 1, 2000
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Horizontal Stress and Coal Mines: Twenty-Five Years of Experience and Perspective
By G. J. Hasenfus
Although theoretical and conceptual knowledge regarding the impact of horizontal stress on underground coal mining excavations have existed since at least the mid-1900s, it wasn?t until the late 1970?
Jan 1, 2006
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Coal and Gas Outburst in a Coal Mine Shaft Development: A Case Study
By Mingju Liu
China has been suffering from coal and gas outbursts since 1950s. Nowadays, the situation has become worse than ever with the need to mine deeper coal deposits at higher production rates in a more com
Jan 1, 2007
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Proposed Criteria For Subsidence Damage To Buildings (d2ee0f1e-295b-4fb1-ab17-d19f1e17df4a)
By Swapan Bhattacharya
United States federal and state regulatory authorities require underground mine operators to adopt adequate measures to minimize material damage to the surface caused by nine subsidence. This paper pr
Jan 1, 1984
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Beyond Coalbrook: Critical Review of Coal Strata Control Developments in South Africa
By J. Nielen van der Merwe
Rock engineering research and technology development in South Africa only received serious attention in reaction to the Coalbrook disaster in 1960. At the time, a number of gaps in knowledge of rock r
Jan 1, 2006