Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"underground mines"”.
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Assessing Thermal Comfort in Deep Underground Mines
… maintaining relative body comfort in deep hot underground mines is of great significance. This is because productivity, health, safety and the bottom line of mine operations depend on it. Comfort studies have been extensively researched, especially in the built and meteorological fields …
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Automatic P-wave Picking of Microseismic Events in Underground Mines
This thesis investigates microseismic P-wave arrival time detection performance of automatic picking algorithms, as well as the handpicking performance of human experts. The data set used in this project was collected from Malmberget mine (LKAB, Sweden) and the handpicked P-wave arrivals were …
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Passive Seismic Tomography and Seismicity Hazard Analysis in Deep Underground Mines
… mining. Recorded by seismic networks in multiple underground mines, arrival time of seismic waves and locations of seismic events are used as sources of tomographic imaging survey. An initial velocity model is established according to properties of a rock mass, then velocity structure is …
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Development of a Wireless Borehole Extensometer for Monitoring Convergence in Underground Mines
… to continuously monitor roof extension in underground mines. The extensometer is designed to be installed in the MSHA-mandated test holes in the roof and measures the displacement between an anchorage point at the top of the borehole and the hole in the roof of the excavation. Once …
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A Series of Studies to Support and Improve DPM Sampling in Underground Mines
… lung cancer risks and other respiratory issues. Underground miners have some of the highest exposures to DPM, due to work in confined spaces with diesel powered equipment. Large-opening mines present particular concerns because sufficient ventilation is very challenging. In such environments, …
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Experimental evaluation of polyester grout as a ground control measure in underground mines
… has been used to insure the stability of underground mine openings for more than twenty years. The polyurethane grout, which is currently being used, has a limited range of mechanical properties that restrict its utilization. Polyurethane also poses serious threats to miners' health due to …
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Development of cooperative behavioural model for autonomous multi-robots system deployed to underground mines
The number of disasters that occur in underground mine environments monthly all over the world cannot be ignored. Some of these disasters for instance are roof-falls; explosions, toxic gas inhalation, in-mine vehicle accidents, etc. can cause fatalities and/or disabilities. However, when such …
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Monitoring and prediction of surface movements above underground mines in the eastern U.S. coalfields
The increased impact on mine subsidence during the recent years led to the development of two semi-empirical prediction methods for the eastern United States coalfields. The methods are based on an extensive data bank, which includes a total of twenty three panels, from nine case studies, which …
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Seismic Wave Velocity Variations in Deep Hard Rock Underground Mines by Passive Seismic Tomography
Mining engineers are tasked with ensuring that underground mining operations be both safe and efficiently productive. Induced stress in deep mines has a significant role in the stability of the underground mines and hence the safety of the mining workplace because the behavior of the rock mass …
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Investigating blast fume propagation, concentration and clearance in underground mines using computational fluid dynamics (CFD)
… industry explosives is an essential component of underground hard rock mining operations. Blasting operations result in the release of noxious gases, presenting both safety and productivity threats. Overestimation of post-blast re-entry time results in production losses, while underestimation …
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Improving Health and Safety at Surface and Underground Mines by Implementing Emerging Technologies Coupled With Geotechnical and Climatic Modeling
… part of any mining operation - surface or underground. When deficiencies are identified, they usually lie with the factors that contribute to unsafe and unhealthy working conditions. The health and safety focus for modern underground mines involves improving the subsurface thermal climate …
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Design of an Experimental Mine Simulator for the Development of a Procedure for Utilization Multiple Tracer Gases in Underground Mines
An experimental mine simulator was constructed which will be used to conduct tracer gas experiments in the laboratory. The test apparatus simulates a mine in a tabular deposit and is modular and simple and can be easily rearranged to represent a variety of mine geometries. The apparatus is …
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Applications and Development of Intelligent UAVs for the Resource Industries
… Recently, the usage of drones has expanded to underground mines, with advancements in drone autonomy in GPS-denied environments. Developments in lidar technology and Simultaneous Localization and Mapping (SLAM) algorithms are enabling UAVs to function safely underground where they can be used …
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Numerical Modelling of Seismic Activity at Tabular Orebody Mines in South Africa using the Boundary Element Method
The deep gold mines that extract the tabular orebodies of the Witwatersrand Basin in South Africa are generally considered to have the highest seismic hazard in the world, and large seismic events at these mines often produce strong ground vibrations that pose risks of damage to mining excavations, …
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Analysis of Wireless Tiltmeters for Ground Stability Monitoring
… ruggedness and sensitivity preventing use in mines. The purpose of this project was to investigate the feasibility of using already existing wireless tiltmeters in the mining setting. Additionally, a new wireless tiltmeter was designed which could be specially tailored for the needs of …
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Design Criteria for Wireless Mesh Communications in Underground Coal Mines
… of 2006. The MINER Act does not just require underground mines to integrate wireless communication and tracking systems, but aims to overall enhance health and safety in mining at both surface and underground operations. In 2006, the underground communication technologies available to the …
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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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Detection of collapses and communicating with inaccessible areas in underground coal mines using WSN
Wireless sensor networks (WSN) are used in underground mines to monitor concentration of gases, temperature, and humidity. A WSN deployed in underground mines can also be used for localisation of miners and for detecting collapses. Underground coal mines consist of long and narrow tunnels, several …
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Effect of sinkholes on soil moisture and ground water recharge at an abandoned underground coal mine near Wilton, North Dakota
<p>Subsidence at abandoned underground mines in south-central and southwest North Dakota has produced numerous sinkholes. Previous studies in the Northern Great Plains have suggested depression-focused recharge may be a significant ground water recharge mechanism in this region. Thus, sinkholes may …
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