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Yield Pillar Application Under Strong Roof And Strong Floor Condition - A Case Study
By P. Tsang
The mechanisms and functions of yield pillar are analyzed by employing finite element method that takes time dependent and plastic failure of rock into consideration. The design criteria for different
Jan 1, 1989
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Laboratory And Field Characterization Of Immediate Floor Strata In Illinois Basin Coal Mines
By Yoginder P. Chugh
The characteristics of weak floor strata associated with actively mined coal seams in Illinois are very important from ground stability point of view and, in many cases, are the governing factors in d
Jan 1, 1989
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Probabilistic Analysis of Blasting Impact on Open Pit Stability (95ce6127-68ed-453f-9268-476a1af1dd45)
By Dae S. Young
A new probabilistic approach is introduced for slope stability analysis including adverse impact of blasting vibrations. The material strength within a slope area is randomized in this bi-variate join
Jan 1, 1984
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Understanding the hydraulic pressure cell
By Keith A. Heasley
Numerous different instruments and techniques have been developed for the purpose of measuring rock stress and stress changes around excavations. The interpretation of the output from many of these in
Jan 1, 1989
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Subsidence prediction using a laminated linear model
By Miklos D. G. Salamon
If all stratifications are horizontal, the computation of surface deformation induced by coal mining involves the prediction of roof and floor convergence and then the transfer of the effects of this
Jan 1, 1989
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Development of Timedependent Surface Subsidence Over the Total Extractions Areas of the Potash Beds Stoped with Interchamber Yield Pillars
By M. P. Nesterov
The method of predicting the time-dependent surface subsidence for gently-inclined potash deposits where total extraction using various sizes of yielding bamier pillars was discussed.
Jan 1, 1998
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A Study of Roof Caving in the Eastern U.S. Coalfields
Appropriate roof control is the most important requirement in underground coal mining and, in the case of longwall panels or second mining in room and pillar extractions, this can be simply expressed
Jan 1, 1986
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Aspect Ratio and Other Parameters That Affect the Performance of Burrell Can Roof Supports
By David F. Gearhart
The Burrell Can1 is a thin, steel, tubular shell filled with aerated concrete that is used as a roof support in coal mines. The Can height is always shorter than the mining entry, so it is capped with
Jan 1, 2012
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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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Ground Control and the Inundation of the Retsof Mine
By Vincent A. Scovazzo
On March 12, 1994, the 1,100-foot deep 2 Yard South panel of the 1l0 year-old Retsof Mine collapsed. At the time of this occurrence, the Retsof Mine was characterized as the world's largest, most
Jan 1, 1997
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Factors Influencing the Occurrence of Coal Pillar Bumps at the 9-Right Section of the Olga Mine
By David C. Oyler
The Bureau of Mines conducted research at the 9-Right Section of the Olga Mine to determine the cause of bumps and aid in the development of appropriate control techniques. The purpose of this paper i
Jan 1, 1987
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Destressing Practice In Rockburst-Prone Ground
By J. Willan
This paper addresses the problem of designing a destress blasting procedure to reduce the incidence of rockbursting in hard rock mines. A review is made of the developed theory and practice of destres
Jan 1, 1984
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Seismic Studies Over Active Longwall Mines
By Thomas H. Wilson
Common offset and refraction seismic data have been collected over four longwall panels at two different locations within West Virginia. Surveys prior, during and after mining were made in both areas.
Jan 1, 1988
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Mitigating the Effects of High Horizontal Stress on Ground Control in An Underground Stone Mine: A Case History
By John Ellenberger
The nature of a stone deposit is rarely defined through exploration and engineering design, but more through the actual experience encountered as the mine develops; hence, issues with ground control a
Jan 1, 2012
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Geology, Ground Control, and Mine Planning at Bowie Resources, Paonia, CO
By Collin Stewart
Bowie Resources maintains one of the most pro-active ground control programs in the U.S. mining industry today. Its guiding philosophy is that everyone in the organization, from the miners at the fac
Jan 1, 2006
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Mining Through In-panel Entries and Full-face Recovery Room Without
By John Smyth
Mining through in panel entries and the full face recovery method has been successfully practiced at U.S. Stwl, Mine 50. Suppat of the cut-through entries and recovery room is critical. Traditionally,
Jan 1, 1998
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Indian Experiences Of Mechanised Coal Pillar Extraction (b04565f5-fd0b-4a80-a8aa-fcb98125fe52)
By Arun Kumar Singh
Wide variation in the nature of the coal seams and the surrounding rock mass of the Indian coalfields and very little information about the associated stress fields were observed to be the major hurdl
Jan 1, 2009
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Pillar Design Issues For Underground Stone Mines (5c6602ba-4b85-4ec3-ad15-c1c321c1afcd)
By A. T. Iannacchione
Underground stone mining represents an emerging sector for the U.S. mining industry. As this expansion takes mines under deeper cover and as more efficient mining methods are utilized, adequate stone
Jan 1, 1999
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Monitoring Indices For The Support And Surrounding Strata System On A Longwall Face (d3af3b40-bd2b-43ab-adc6-f4c445bf5433)
By Ming-Gao Qian
How to monitor and control the support and surrounding strata system on a longwall face effectively is one of the major research problems in ground control. Based on observations on movements of the s
Jan 1, 1992
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The research on the mechanical properties of hard roof in underground coal mining
By Xu Lin Sheng
During the mining course, when the roof above coal seams is constituted by thick and hard sandstone (conglomerate), sudden roof movements often take place with great force and de¬struction which is th
Jan 1, 1989