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Sidewall Fracturing In Coal Room And Pillar And Pillar Extraction Panels (fdea63a5-d54d-46e2-aad5-6c4f1c72e2f1)
By André Vervoort
In coal room and pillar, and pillar extraction panels, the sidewall conditions were investigated based on underground measurements and numerical simulations. Three-dimensional linear elastic models pr
Jan 1, 1992
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Optimization Of District-Wide Mine Layout In Multi-Seam Mining: A Case Study
By Huamin Li
Mine # 8 of Pindingshan Coal Group, Henan Province, China has an annual production 2 million metric tons. But it encounters many problems, e.g. mine layout is complicated, roadway maintenance is diffi
Jan 1, 2000
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Geo-Mechanical Property And Failures Of Weak Roof Shales In Coal Mines
By Yunqing Zhang
Weak shales refer to those with lower strength, thinly- laminated structure, sensitivity to moisture and weathering as well as significant time dependent behavior. It has been said that many future co
Jan 1, 2004
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Investigations Of Underground Coal Mine Bursts
By K. Haramy
Coal mine bursts or bumps involve the violent, rapid failure of coal and rock in or around a mine excavation. Failure is normally associated with high stress and brittle or brittle-elastic materials;
Jan 1, 1984
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Stress Control Method Applied to Stabilization of Underground Coal Mine Openings (e5cbe8ad-30a8-4144-a7b5-db19e81a247a)
By Shosei Serata
Serious floor heave of up to 2.4 m in a 2.4-m high mine entry was eliminated by applying the stress control method of mining, as a last resort, at the No. 5 coal mine of Jim Walter Resources, Inc., in
Jan 1, 1984
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Simulated Materials Modeling And Analysis Of The Overburden Strata Movement In Top Coal Caving Mining
By Zhou Ying
Based on the mining condition and roof lithology of the 2-3 coal seam at Gengcun Mine, the simulated materials modeling method was used to study the movement process and characteristics of overburden
Jan 1, 2001
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Failure Modes Of Mine Tunnels In Stratified Rock Structures With Reference To Stress Field Conditions
By Hui Chen
The paper describes the use of a physical model technique to investigate the failure modes of mine tunnels with reference to the in situ stress field. The characteristics of stratification commonly en
Jan 1, 1993
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Mitigating Subsidence Influences on Residential Structures Caused by Longwall Mining Operations
By Yi Luo
The severity of disturbances caused by longwall mining subsidence to various residential structures can be re¬duced. The success of such mitigation efforts depends on accurate subsidence prediction, c
Jan 1, 2003
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Tensile roof failure arising from horizontal compressive stress and geological slips
By Alan Bugden
Goedehoop colliery in South Africa has experienced a number of substantial roof falls in roadways and intersections. Many of these have been associated with geological slips and/or horizontal compress
Jan 1, 2003
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Longwall Mining-Induced Abutment Loads and Their Impacts on Pillar and Entry Stability
By Jinsheng Chen
Longwall mining-induced abutment loads on the surrounding coal pillars can be grouped into two categories in terms of the relative position of the coal pillars and the longwall face. They are the fron
Jan 1, 2002
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Longwall Mining-Through the Backfilled In-Panel Entries at Cyprus Emerald Mine
In recent years, improvements made to the longwall system have accelerated at a faster pace than those made to the gate entry development system. As a consequence, unless planned years ahead of time,
Jan 1, 1997
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Reinforcement of Large Pillars by Bolting (8821999e-4c04-46db-a69e-e7a56781ac96)
By S. J. Mitchell
An analysis of bolting reinforcement of several large [approximately 18 m (60 ft) cube] pillars was performed. The many overcoring stress profiles in pillars at the mine were used to produce generaliz
Jan 1, 1984
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The Stress And Failure Paths Followed By Coal Mine Roofs During Longwall Extraction And Implications To Tailgate Support
By Ross Seedsman
Discussion on the design of roof support in tailgates has often been conducted without a clear statement of the stress and failure conditions acting. There is general agreement that in the tailgate th
Jan 1, 2001
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Ground Control Experiences in a High Horizontal Stress Field at Inland Steel Coal Mine NO. 2,
By C. Thomas Blevins
This paper is intended to be a hands on experience account about ground control in a Southern Illinois coal mine. Its aim is to show how a combination of real world mining practices and constraints al
Jan 1, 1984
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Comparative Case Study Of Yielding And Critical Coal Pillar Designs In Bump-Prone Strata
By J. R. Koehler
The failure of yield pillar-based gate mad designs to provide adequate ground control performance is primarily related to the use of "critically" sized chain pillars. A "critical" pillar is one that f
Jan 1, 1995
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Causes of Massive Directional Roof Falls in Room and Pillar Mines - Two Case Studies
By S. S. Peng
In recent years many roof falls have been conveniently attributed to the adverse existence of a high horizontal stress. The normal practice of not conducting a follow-up study in a roof fall investiga
Jan 1, 1999
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Bailey Mine Slurry Impoundment Longwall Subsidence Monitoring
By Richard J. Perin
Subsidence monitoring was conducted in proximity to the 1-A and 2-A longwall panels at Consol Pennsylvania Coal Co.'s (CPCC) Bailey Mine slurry impoundment. Monitoring fullfills federal Mine Safe
Jan 1, 1988
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The Broken Rock Zone Around Tunnels And Its Support Theory
By Fangting Dong
The broken rock zone (BRZ) and the tunnel support theory are investigated. The relationship between the BRZ and the related factors, the interaction between the BRZ and supports, and the function of s
Jan 1, 1988
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Analysis of a Stability Problem in an Underground Coal Mine Due to Floor Conditions
By M Nombe
Based on the analysis of a case study at POWELTON No.2 MINE, it was determined that mine stability problems had occurred due to floor softening. A fireclay (underclay) layer in the immediate floor was
Jan 1, 2002
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Strategies for the Application of Rockbolting Technology to Longwall Gateroads in Chinese Coal Mines
By Zuoliang Xiu
Experience indicates that rockbolting is the most efficient and cost effective means of supporting gateroads of retreating longwalls. However, gateroads supported solely by rockboltiug currently accou
Jan 1, 1997