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Book Application of Water Jet Assisted Drag Bit and Pick Cutter for the Cutting of Coal Measure Rocks Final Technical Report Tests of Combination in Different Rocks

Download or read book Application of Water Jet Assisted Drag Bit and Pick Cutter for the Cutting of Coal Measure Rocks Final Technical Report Tests of Combination in Different Rocks written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory investigation was made of the effects of high pressure water jets on the cutting forces of drag bit cutters in sedimentary rocks. A hard and soft sandstone, shale and limestone were tested with commercially obtainable conical and plow type drag bits on the EMI linear cutting machine. About 1200 cuts were made at different bit penetration, jet orientation, and water pressure to determine the reduction of cutting forces on the bit from the use of the water jet. Both independent and interactive cutting was used. The greatest reduction in cutting forces were with both of the sandstones; the drag forces were reduced about 30 percent and the normal forces about 60 percent at 5000 psi water pressure with the nozzle behind the bit. The method was less effective in the shale, except at 10,000 psi water pressure the reduction in drag force was about 55 percent. Of the rocks tested, the limestone was least affected by the water jet. The cutting forces for the plow bit showed continuous change with wear so a machined conical bit was used for most of the testing. Tests with the plow bit did show a large reduction in cutting forces by using the water jet with worn bits. An economic analysis of equipping a drag bit tunnel boring machine indicated that the water jet system could reduce costs per foot in sandstone by up to 40 percent.

Book A Review of Water jet assisted Rock Cutting

Download or read book A Review of Water jet assisted Rock Cutting written by Michael Hood and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Water jet assisted Cutting

Download or read book Water jet assisted Cutting written by and published by . This book was released on 1985 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Greater mining productivity requires a more efficient cutting process. The cutting force available from today?s mining machines has been optimized with respect to machine size and weight. Researchers have shown that when employing water-jet-assisted cutting, bit forces and drum torques can be reduced significantly, which may allow mining machines to become lighter and more efficient. The Bureau of Mines has initiated a program to develop a water- jet-assisted rotary cutting system using the conventional bit assisted by a directed water jet operating at moderate pressures (3,000 to 10,000 psi). This water-jet-assisted cutting system has the potential to improve cutting efficiency without increasing machine horsepower or water usage (beyond what is presently used for dust control) or requiring fundamental changes in mining practice. IR addition to improvements in productivity, other anticipated benefits of water-jet cutting include reduced generation of respirable dust, elimination of frictional ignitions, increased bit life, reduced fines, and fewer machine vibrations. The papers presented at this open industry meeting discuss the development of water-jet-assisted cutting technology and future application of this technology to a variety of mining techniques including roof drilling and longwall mining.

Book Information Circular

Download or read book Information Circular written by and published by . This book was released on with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Summary of Combustion Products from Mine Materials

Download or read book Summary of Combustion Products from Mine Materials written by Margaret R. Egan and published by . This book was released on 1990 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Waterjetting Technology

Download or read book Waterjetting Technology written by D.A. Summers and published by CRC Press. This book was released on 2003-09-02 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Waterjet technology is used in a variety of industries including civil engineering, mining, geotechnical engineering, tunnelling, defence, construction and conservation. This book is essential reading for all those engaged in waterjet technology - from manufacturers of the equipment through to Government Contracting Officers who let the awards, to the individual contractors and their engineers.

Book MgO Filtration Research

Download or read book MgO Filtration Research written by Daniel N. Tallman and published by . This book was released on 1987 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Excavation Support and Monitoring

Download or read book Excavation Support and Monitoring written by J.A. Hudson and published by Elsevier. This book was released on 2016-04-06 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approx.850 pages

Book Chemically Enhanced Drilling

Download or read book Chemically Enhanced Drilling written by Pamela J. Watson and published by . This book was released on 1985 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Introductory Mining Engineering

Download or read book Introductory Mining Engineering written by Howard L. Hartman and published by John Wiley & Sons. This book was released on 2002-08-09 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introductory text and reference on mining engineering highlighting the latest in mining technology Introductory Mining Engineering outlines the role of the mining engineer throughout the life of a mine, including prospecting for the deposit, determining the site's value, developing the mine, extracting the mineral values, and reclaiming the land afterward. This Second Edition is written with a focus on sustainability-managing land to meet the economic and environmental needs of the present while enhancing its ability to also meet the needs of future generations. Coverage includes aboveground and underground methods of mining for a wide range of substances, including metals, nonmetals, and fuels. Completely up to date, this book presents the latest information on such technologies as remote sensing, GPS, geophysical surveying, and mineral deposit evaluation, as well as continuous integrated mining operations and autonomous trucks. Also included is new information on landscape restoration, regional planning, wetlands protection, subsidence mitigation, and much more. New chapters include coverage of: * Environmental responsibilities * Regulations * Health and safety issues Generously supplemented with more than 200 photographs, drawings, and tables, Introductory Mining Engineering, Second Edition is an indispensable book for mining engineering students and a comprehensive reference for professionals.

Book Rock Mechanics in Productivity and Protection

Download or read book Rock Mechanics in Productivity and Protection written by C. H. Dowding and published by Society for Mining Metallurgy & Exploration. This book was released on 1984 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fossil Energy Update

Download or read book Fossil Energy Update written by and published by . This book was released on 1981 with total page 1002 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1981 with total page 1740 pages. Available in PDF, EPUB and Kindle. Book excerpt: