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Showing 1 to 20 of 52 for “"Underground Mining"”.
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Surface Water Impacts from Active Underground Mining
High extraction mining techniques have produced the need to mitigate and understand ground movements associated with this technology. Tools such as the Surface Deformation Prediction System (SDPS) facilitate sound scientific decision making in the industry and has continually improved since its …
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Modelling and control of an articulated underground mining vehicle
… productivity, efficiency and safety in the mining environment. Productivity is mainly increased by longer working hours; efficiency is improved by repetitive, faultless and predictable work; and safety is improved by removing the human operator from the harsh environment. However, before the …
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Drivable region detection for autonomous robots applied to South African underground mining
… capability to identify drivable regions in underground terrains. A system model that compares the drivability analysis of underground terrains using the entropy model and statistical region merging (SRM) was developed, with a view to presenting an analysis of 2D and 3D results. The approach …
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An investigation into the modeling of ground deformations induced by underground mining
The mechanisms of strata deformation due to underground mining were analyzed in an effort to better understand immediate roof behavior and surface displacements. Strata deformation characteristics above longwall and room-and-pillar mines in the eastern U.S. coalfields were evaluated and a numerical …
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Evaluation and Simulation of Wireless Communication and Tracking in Underground Mining Applications
In an underground coal mine, the measure of a communication system is the coverage area it can provide at a quality that ensures a miner can communicate with other miners in and out of the mine during normal and emergency operations. The coverage area of a wireless mesh communication system can be …
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Hydrogeologic analysis of streamflow in relation to underground mining in northern West Virginia
Land subsidence, caused by longwall mining, has a negative effect on overlying watersheds. Nine streams were monitored from their headwaters to their mouths for discharge, temperature, conductivity, alluvium thickness, and alluvium sediment size. Seven streams are located over undermined longwall …
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Preliminary Design of an Improved Load Measuring Device for Underground Mining Standing Supports
… support is often used in conjunction with underground retreat mining. Knowledge of the load-displacement behavior of a standing support and loading induced by the mine opening is critical proper support selection. The NIOSH STOP database contains load-displacement laboratory test data for …
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A Geotechnical Study of the Squeeze Problem Associated With the Underground Mining of Coal
Made available in DSpace on 2014-12-14T07:10:46Z (GMT). No. of bitstreams: 1 7606764.pdf: 8918129 bytes, checksum: 46ae1aac3fe3c3acb38fdbcc7c629947 (MD5) Previous issue date: 1975
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Development of a Method for Measuring Rock Mass Air Permeability and Applications to Underground Mining
… inflows are a major concern to many Saskatchewan mining operations. Rock mass behavior and stability have been linked to the presence of groundwater and the inflow potential. An estimate of rock mass hydraulic properties is an important factor for assessing groundwater inflow potential and the …
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Apparent Stress Estimates of Seismic Events Associated with Underground Mining Operations in Sedimentary Rock Units: Implications for Improving Underground Roof Collapse Warning Systems
… analyze recordings of seismic events induced by underground mining operations at the Moonee Colliery, located in Australia, and at the Springfield Pike Limestone Quarry, located in the United States. The data were recorded underground in the vicinity of active mining operations and were initially …
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A Study of Ground Penetrating Radar Methods in an Underground Stone Mine to Improve Ground Control
… associated with karst voids in large opening underground mines. Issues include water inrush, structural instability, and engineering uncertainty in these environments. Coupled with the fracturing prevalent in folded sedimentary rocks, karsts are complex and challenging ground control risks. …
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Three dimensional measurement of textured surfaces using digital photogrammetric techniques
… located at depths of over 3,000m below surface. Mining excavations follow tabular reefs that are kilometres in extent, but only a few centimetres thick. Due to the great depths of these excavations and the large overburden of rock, immense pressure is exerted on the rock mass being excavated. In …
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Mining and environmental factors in selecting an underground versus a quarry mining system
Historically, the decision on whether to mine by underground or surface methods has been based on mining and economic considerations. This is rapidly changing since the environmental imperatives that have evolved over the past two decades are now a critical part of the decision process. As a …
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Localisation and navigation in GPS-denied environments using RFID tags
… and navigation problem in the context of an underground mining environment. This kind of environment has little or no features as well as no access to GPS or stationary towers, which are usually used for navigation. In addition dust and debris may hinder optical methods for ranging. This …
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Economic and system feasibility study of municipal waste stowage in underground coal mines
… surface disposal of municipal waste offers the mining industry potentially enormous economic and environmental opportunities. If underground space created by mining can successfully be utilized for safe waste stowage during the mining process, there will be immediate and substantial benefits to …
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Evaluation of underground supports made of wood and other materials
… system is one of the most important systems in underground mining. It may consist of various types of supports such as props, cribs, steel arches, powered supports and roof bolts, among others. In this research, powered supports and roof bolting are not included. Evaluation of underground …
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Development of an Underground Automated Thin-Seam Coal Mining Method
It is predicted that coal mining in Southwest Virginia, and the economic stability that it brings to the area, will continue to decline over the next decade unless an environmentally sound, and economically viable means can be found to extract seams of high quality coal in the thickness range of 14 …
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Encumbered space and its effect on mine transportation
… the maximum theoretical production rate of an underground mining situation to obtain a more realistic estimate of the actual production rate is introduced. An example of the use of derating factors (derived from the results of questionnaires) in obtaining an estimate of production is presented. …
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Study of the use of Electret Ion chambers as radom dosimeters in South Africa
… be a major contribution to background dose. The underground mines in South Africa present a major occupational hazard. A need for cheap personal monitoring has been identified. In this thesis, commercially available electret ion chambers (EICs) are studied, with a view to use them as personal …
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An economic evaluation of backfilling in Virginia's coal mines
… used to place material in the voids created by underground mining. This technique has been used extensively abroad to reduce surface subsidence, fire hazards, and temperatures in underground workings. It can also help to eliminate environmental problems caused by coal waste dumps, improve coal …
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