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SME-ICGCM (1801)
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TITLE Investigating the Contributing Factors to Rib Fatalities Through Historical Analysis
SUMMARY Rib-related accidents in underground coal mines continue to cause injuries and take lives at a rate of 1.3 fatalities per year for the last 17 years. Prevention of these accidents cannot simply be a matter of installing more rib support, though the eventual final solution will undoubtedly include that component. Ultimately, rib safety will be brought about through an understanding of the causes and mechanisms that cause rib fatalities, and by fine-tuning mining methods and procedures that are cu...
AUTHOR Jones, Tristan H.
TITLE Analyses of De-Confinement Mechanisms of Unstable Failures in Underground Mining Conditions
SUMMARY The de-confinement mechanisms of unstable failures as they occur in deep coal mining conditions are investigated using a distinct element numerical modeling code. The Mohr-Coulomb and continuously yielding joint constitutive models were used to study the compressive failures in coal and slip behavior of coal-rock interfaces, respectively. The effect of strength variations within interfaces on the failure mechanism of mining faces is also studied. The stability of interface slip failures was foun...
AUTHOR Gu, Ruixiang
TITLE Ground Control Design Considerations for Reducing Longwall?Induced Stress and Seismicity Associated with Massive Sandstone under Deep Cover
SUMMARY Thick, massive sandstone present in close proximity of the mining horizon can create difficult longwall caving issues, which may lead to severe face loading and subsequent face roof control problems. Under deep cover, such delayed caving and overhang not only impose additional loading on the gate road pillar system, but they also increase the potential for large seismic events. Such a combination of thick, massive sandstone geology and deep cover was present over a portion of a southwestern Virg...
AUTHOR Su, Daniel W.H.
TITLE Development of An Enhanced Methodology for Ground Movement Predictions Due to Longwall Mining in the Illinois Basin
SUMMARY The Illinois Basin has an extensive history with the use of mechanized longwall mining dating back to the early 1970?s. In recent times, technological advances have resulted in increased panel widths from 800 feet to over 1400 feet and daily panel advance rates have also increased significant l. The prediction and control of subsidence and surface deformation due to underground mining are important considerations in the permitting, planning, and monitoring of these coal mining operations. The...
AUTHOR Agioutantis, Zach G.
TITLE Roof Geotechnical Properties for Roof Control Purposes in Illinois Coal Field
SUMMARY Determining the roof stability condition of underground coal mines in the Illinois Basin is sometimes very challenging. The roof stability of Illinois mines are mostly affected by two types of shales: Anna Shale and Energy Shale. These layers are sometimes weak in parallel bedding when subjected to horizontal stresses. The roof rocks in the Illinois Basin are are typically more moisture sensitive than the other coal fields. In this study the geotechnical properties of some of the shale units a...
AUTHOR Osouli, Abdolreza (Reza)
TITLE Estimating Coal Strength Based on Historical Laboratory Tests and Geomechanics Classification
SUMMARY The coal seam strength and the failure criteria that represent the behavior of the coal seam are very important for mine section and pillar design. Additionally, mine section and pillar design take into account roof and floor layers, which form the roof-pillar-floor system. Therefore, underground ground control design begins, most importantly, with rock mass characterization. Another issue is the distribution or behavior of the coal seam strength for the whole mine area. Sometimes, the coal seam...
AUTHOR Zingano, Andre
TITLE The Implementation of Rock Mechanics Into a Multiple Level Limestone Mine
SUMMARY In the 1950s, an underground limestone mine in the Camp Nelson Formation was developed from an outcrop exposure. The Camp Nelson Limestone met the requirements for DOT stone and aggregate. The mine ownership changed several times, which resulted in distinct mine designs in Level 1. Based upon the production requirements and an attempt to maximize limestone recovery from a single level, a variety of pillar dimensions and three mining heights (28 feet, 68 feet and 83 feet) were developed. This...
AUTHOR Newman, David A.
TITLE Overburden Failure Characteristics of Extra?Thick Seam Using Top Coal Caving Mining Method at Tongxin Coal Mine
SUMMARY In order to determine the overburden failure characteristics of extra-thick seam mining, EH4 electromagnetic image system and borehole televiewer survey were applied to panel 8100, Tongxin coal mine. EH4 electromagnetic imaging system was used to map the overburden strata before and after mining. Analysis of the distribution of the electrical conductivity showed that the fractured zone height was 492-558 ft (150-170m); Observation through the borehole televiewer showed that the fractured zone he...
AUTHOR Zhu, Zhijie
TITLE Rock Characterization Using Time - Series Classification Algorithms
SUMMARY Development of measurement while drilling (MWD) systems for ground control applications in mining applications has recently been an active research topic. The main goal is to utilize the drilling information for characterizing the ground condition. Such characterization is the key to the accurate and efficient mapping of hazards and proper planning of ground support. However, most of the existing drilling units and measurement while drilling systems are mainly developed for joints and voids dete...
AUTHOR Bahrampour, Soheil
TITLE Learning Our Geotechnical Limits and Pushing Our Longwalls Through Them
SUMMARY The world?s ever-expanding demand for energy and coking coals has resulted in the underground mining industry looking at taking on increasingly marginal and geotechnically challenging deposits. The drivers for this change include a reduced availability of open cut reserves and a lack of remaining ?good coal leases?. The lack of plum deposits is forcing some companies wanting to enter the coal supplymarket to purchase and operate in higher risk, lower margin areas. As geotechnical professionals,...
AUTHOR Campbell, Richard N.