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Geologic Feature Prediction Using Roof Bolter Drilling Parameters, Benjamin T. Mirabile
Geologic Feature Prediction Using Roof Bolter Drilling Parameters, Benjamin T. Mirabile
Graduate Theses, Dissertations, and Problem Reports
The design of a safe and efficient roof support system is essential for any underground coal mining operation. All underground coal mines in the United States install roof bolts with a roof bolter as the primary means of supporting the mine roof. Proper application of roof bolting is dependent upon knowledge of the mine roof geology.;Recently developed control and data acquisition technologies allow the drilling performance of these roof bolters to be monitored on a real-time basis. Drilling data collected from these machines can be used to determine geological features present in the mine roof. A J. H. Fletcher & …
Effect Of Rate Of Sumping On Fragmentation Process In Laboratory Rotary Cutting Simulator, Muralidharan Venkataraman
Effect Of Rate Of Sumping On Fragmentation Process In Laboratory Rotary Cutting Simulator, Muralidharan Venkataraman
Graduate Theses, Dissertations, and Problem Reports
This study was done to examine the fragmentation process and to improve sumping. Research has demonstrated that specific energy and specific respirable dust must be kept minimum to produce the optimum parameters of the rock/coal breakage process and to attain maximum sumping. There are three major elements affecting the efficiency of the cutting head namely: (1) Geometry and size of the cutting tool, (2) Geometry of the drum and lacing and arrangements of the tools on the drum and (3) Effect of rate of advance/dynamic impacts. The emphasis is made on the rate of advance utilizing a miniature rotary cutting …
Effect Of In-Situ Stresses On The Stability Of Coal Mine Development Workings, Murali Mohan Gadde
Effect Of In-Situ Stresses On The Stability Of Coal Mine Development Workings, Murali Mohan Gadde
Graduate Theses, Dissertations, and Problem Reports
Among the different types of ground control problems associated with underground coal mining, those related to in-situ stresses are the most common ones affecting the safety of a mining operation. As a result, this has been the focus of many ground control research works done in the recent years. More work has been done in this thesis to add additional information on the in-situ stress related ground control issues of the underground coal mine development workings.;Three-dimensional finite element modeling has been done to examine the Influence of the in-situ maximum horizontal stress angle on the stability of both the entry …
Geological Mapping Of Entry Roof In Mines, Quanzhong Gu
Geological Mapping Of Entry Roof In Mines, Quanzhong Gu
Graduate Theses, Dissertations, and Problem Reports
Although strata types and approximate thickness of strata can be obtained from the geological exploration materials of the mine, these do not meet the requirements for roof bolting design because of the ever-changing roof geological properties, including rock strength, discontinuity distribution, and thickness of rock strata. In order to obtain such geological information in a timely manner, the technology of geological mapping of the roof in the mine, which uses the drilling parameters acquired during the drilling process, has been proposed. The study in this dissertation attempts to map the roof geology by developing a new drilling parameter, drilling hardness, …
Modular Track Panels For Improved Safety In The Mining Transportation Industry, Donald Sterling Tusing
Modular Track Panels For Improved Safety In The Mining Transportation Industry, Donald Sterling Tusing
Graduate Theses, Dissertations, and Problem Reports
Locomotives and "mine cars" often derail (often two or three times daily) in coalmines causing fatal injuries, fires initiated from sparks during derailment, and costly downtimes. Modular track panels (resembling the ladder track systems used in Japan) were designed and tested for bending behavior and load sharing characteristics, between track modules and also between rails, to improve safety of miners during transportation. Prefabricated track modules made of prestressed concrete and fiber reinforced polymer (FRP) composites were evaluated. Two modular prestressed concrete modules, each 15 ft long, were tested, as well as one set of prestressed concrete half-panels to test the …
Design Considerations For Longwall Yield Pillar Stability, Khaled Morsy Mohamed
Design Considerations For Longwall Yield Pillar Stability, Khaled Morsy Mohamed
Graduate Theses, Dissertations, and Problem Reports
Coal mine bumps have presented serious mining problems in the United States throughout the 20th century. Persistent bump problems not only threaten the safety of miners, but also have caused the abandonment of large coal reserves and have led to premature mine closures. Current application of yield pillars shows that it can prevent coal bumps in some Longwall mines. In this dissertation, the need for a new method to design yield pillars in bump prone conditions is established. In order to fulfill this need, a PC-design program based on finite element modeling was developed. This program can design stable yield …
Effects Of Bit Geometry In Multiple Bit-Rock Interaction, Rizwan Ahmad Qayyum
Effects Of Bit Geometry In Multiple Bit-Rock Interaction, Rizwan Ahmad Qayyum
Graduate Theses, Dissertations, and Problem Reports
The impact of bit-coal/rock interaction during the cutting process in underground mines is great concern to the mining community of the world. Rock/coal cutting bears directly on rock/coal dust generation that causes "black lung/silicosis" in miners. On the other hand, rock cutting generates radiance of sparks that has potential to cause face ignition. Bit wear affects productivity, safety and economy. Hundreds of face ignitions and millions of dollars in productivity and compensation for respirable rock/coal dust related diseases are attributed to the cutting action of continuous miners/shearers. These undesirable impacts could be minimized by proper selection of bit types, bit …