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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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An Underground Trial Of Cable Slings For Remedial Support Of Longwall Gateroads
By William D. Gallant
This paper describes a joint cooperative project between the CANMET Cape Breton Coal Research Laboratory and the Cape Breton Development Corporation to conduct a trial of split set cable slings for re
Jan 1, 1990
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Understanding the Causes of Roof Control Problems on a Longwall Face From Shield Monitoring Data ? A Case Study
By Robert Trueman
This paper details the results of an assessment aimed at understanding the shield loading mechanisms associated with strata-related issues on a longwall face. Shield load cycle analysis theories devel
Jan 1, 2011
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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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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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Evaluation of Anchorage Integrity for Grouted Bolts in Weak Strata
By W. C. Smith
Over the past several years, the Bureau of Mines has conducted studies on the performance of fully grouted resin bolts In underground mines. The effectiveness of resin-grouted bolts in maintaining a c
Jan 1, 1987
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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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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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Multiseam Mining On South African Collieries
By R. W. Hill
Multiseam mining has been carried out at many collieries in South Africa. It the seams are In close proximity difficult and dangerous mining conditions may arise. In the Witbank area multiseam bord an
Jan 1, 1995
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Development Of A Statistical Technique For Assessing Sandstone Escarpment Stability
By Hamid Maleki
During the last decade, a significant amount of research has been conducted by Energy West Mining Company, government agencies, academia, and consulting companies to develop predictive tools for asses
Jan 1, 2000
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Evaluation Of Existing Predictive Methods For Mine Subsidence In The U. S. (1ec2d374-5864-4775-9b19-24759c4f95be)
By Vladimir Adamek
Two existing predictive methods were chosen for evaluation; an influence function (Gals Theory) and a profile function (hyperbolic). These were applied to several field measured subsidence pro¬files o
Jan 1, 1981
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Mistakes, Misconceptions, and Key Points Regarding Secondary Roof Support Systems (b87a5324-ac75-480a-90d7-e642733c14a4)
By Thomas M. Barczak
Roof support systems are necessary to provide stable mine openings and much research has been conducted to design a variety of roof support systems that will function in various manners to ensure that
Jan 1, 2001
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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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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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Integrating Ground Control And Mine Site Data Through A Geographic Information System
By Douglas C. Peters
Part of the ground control research at the U.S. Bureau of Mines is involved with improving ground control data collection and analysis methods. A geographic information system (GIs) is being used with
Jan 1, 1990
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Stability And Stress Evaluation In Mines Using In-Seam Seismic Methods
By E. M. Williams
The U.S. Bureau of Mines is investigating the use of in-seam seismic methods to monitor stress-induced changes in coal near the working face of longwall mines. Seismic surveys performed through a long
Jan 1, 1994
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Proposed Criteria for Assessing Subsidence Damage to Surface Structures
By Swapan Bhattacharya
Section 516 of Public Law (PL) 95-87, commonly known as the Surface Mining Control and Reclamation Act of 1977 (SMCRA), requires that underground coal mine operators must 'adopt measures consiste
Jan 1, 1984
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Aerostatic Support System For Underground Coal Mines
By R. J. Morrell
The Bureau of Mines developed a ground support system for use with an underground coal auger. The system consists of inflatable airbags that are inserted in the holes as they are drilled, and then gra
Jan 1, 1988
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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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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