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SME-ICGCM (1801)
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TITLE Risk Analysis and Risk Ranking in Tunneling: A Case Study
SUMMARY Constructing tunnels underground is generally described as a high-risk activity because conditions in the surrounding area tend to be unpredictable. This would and can create unique dangers in every situation. It is important to gain a deep understanding of the risks associated with tunneling in order to reduce the likelihood of their occurrence and severity of their consequences should they occur. For this to be achieved, different risks should first be evaluated and ranked according to their ...
AUTHOR Oraee, Behdeen
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 Road Header Roof Bolting Module
SUMMARY In underground mining and tunneling, machine design is predominantly dictated by mine conditions and individual customer desires. In partnership with Australian companies WDS Limited and Cram Fluid Power, the engineering department of J.H. Fletcher & Company was tasked to design and manufacture roof bolting modules to be mounted off both sides of a roadheader, providing in-cycle bolting. The objective was to produce a boom and bolt module that would allow an operator to bolt from a remote loca...
AUTHOR Farrell, Sean C.
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 Validation of Overburden Failure Zone in Complex Extra Thick Coal Seam by EH?4 Magnetotelluric Method
SUMMARY EH-4 Electrical conductivity imaging system has been playing an important role in prospecting, looking for water resource, and determining coal mine gob boundary by virtue of its significant advantages such as collection of large volume of data, light weight, fast analysis, high-precision, and low cost. However, it has little application in determining the overburden failure zone and development of water flowing fractured zone and bed separation space in complex extra thick coal seam conditions....
AUTHOR Rong, Hai
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 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.
TITLE Introduction of a Measurement Based Ground Control Management System to a Deep Level Potash Mine
SUMMARY A measurement-based ground control management system, commonly employed in coal mines, has been successfully implemented in a UK potash mine operating at a depth of over 800 m. This system includes the routine deployment of telltales in roadways throughout the mine to mitigate against the risk of large-scale roof falls and the deployment of detailed ?design monitoring? instrumentation for ongoing design verification. The routine monitoring systems used in coal mines have not been, to date, commo...
AUTHOR Garcia, Alexandra