Download or read book Snow Compaction in Antarctica written by Earl H. Moser and published by . This book was released on 1964 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In situ measurements of Antarctic snow compaction compared with predictions of models written by R.J. ARTHERN and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compacted snow Runways in Antarctica Deep Freeze 61 64 Trials written by R. C Coffin (Jr) and published by . This book was released on 1966 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Deep Freeze 61, NCEL provided technical guidance to a Navy snow- compaction team investigating the practicability of building roads on snow- covered sea ice over McMurdo Sound and runways on the deep snow cover of the Ross Ice Shelf adjacent to McMurdo Station. These investigations and trials continued through Deep Freeze 64. This work was directed toward the development of a layered, compacted-snow runway on deep snow which would support aircraft weighing up to 155,000 pounds with tires on the main wheels inflated to 135 psi; it was only partially successful. During the trials, there were intermittent areas of compacted snow capable of supporting aircraft weighing up to 100,000 pounds with main tires inflated to 90 psi, but low-strength areas prevented takeoffs and landings with aircraft weighing over 25,000 pounds with main tires inflated to 60 psi. New processing and elevating equipment introduced in the Deep Freeze 64 trials showed considerable promise of producing dense, uniform, high -strength, elevated areas of compacted snow. It was concluded that the trials should continue in Deep Freeze 65 to explore the capabilities of this equipment.
Download or read book Compacted snow Runways in Antarctica written by G. E. Sherwood and published by . This book was released on 1967 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques and equipment have been developed to utilize clean, undisturbed snow as a building material for emergency and temporary roads, runways, and skiways in polar regions. However, these routes are often needed in areas where the snow is contaminated. During Deep Freeze 65, a compacted-snow runway was constructed in an area of contaminated snow near McMurdo, Antarctica. The area had been contaminated by oil spillage, soot, and debris from previous operations. Physical property tests were conducted on the compacted snow near the end of Deep Freeze 65 and during Deep Freeze 66. It was concluded that contaminated snow can be processed to produce load-carrying material capable of supporting C-130 aircraft and other heavy loads at temperatures below 20F; however, because of the extra work involved to clear and process such snow, its marginal load-carrying capabilities at temperatures above 20F, and the possibility of low-strength areas, its use is not recommended where clean snow is available. New processing techniques resulted in improved quality control of compacted snow, and it was recommended that effort be continued to improve processing techniques. (Author).
Download or read book Surface Hardening of Compacted Snow in Antarctica written by N. S. Stehle and published by . This book was released on 1966 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies were conducted in the Antarctic to increase the surface strength and wearing ability of compacted snow by rolling the snow when it had excess moisture, during periods of high temperature and solar radiation, and by melting and refreezing the surface snow using controlled absorption of solar radiation. The increase of strength in the areas rolled indicated that the addition of moisture increased the strength in the top 8 inches provided the surface was rolled more than once but probably less than 10 times. Although the excess moisture in the snow during these tests was due to weather conditions, water from an outside source during rolling should promote surface hardening; field tests to investigate the addition of water before rolling are planned for the 1966-67 antarctic summer. The controlled radiation absorption tests, which were conducted late in the summer season, showed that there were limits to the effectiveness of solar radiation absorption in promoting surface hardness. (Author).
Download or read book Compacted snow Runways in Antarctica written by E. H Moser (Jr) and published by . This book was released on 1966 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Snow-compaction investigations were conducted on the Ross Ice Shelf adjacent to McMurdo Sound during Deep Freeze 65 following investigations made during Deep Freeze 61 through Deep Freeze 64. A 150-by 6,000-foot runway was constructed by adding a 16-inch layer of compacted snow over an existing layer. Construction was completed on 24 November 1964 and the runway was maintained and repaired for aircraft tests until 14 February 1965. Snowplow carriers used in clearing the runway of drift snow greatly reduced the time required for this operation over previous methods using a snowplane. A 6 by 6 truck-tractor with high-flotation tires served as a prime mover for maintenance equipment, and resulted in large savings in time over use of a size 2 snow tractor. This wheeled vehicle also eliminated damage to the runway surface caused by track vehicles. The runway was tested early in the season by a 25,000-pound C-47J aircraft with tire inflation pressure of 60 psi; it was tested five times at approximately 2-week intervals by an LC-130F aircraft weighing from 90,000 to 135,000 pounds with tire inflation pressures of 85 to 95 psi. During the first LC-130F tests, intermittent failures occurred in the DF-65 layer of compacted snow due to misses between lanes of snow processed by the mixers and seams of unprocessed snow between the DF-64 and DF-65 layers.
Download or read book Technical Report written by and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snow and Ice Properties as Related to Roads and Runways in Antarctica written by Gunars Abele and published by . This book was released on 1967 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic tests were performed to determine the Young's modulus of sea ice, derived from longitudinal wave velocities measured with a soniscope. Static tests consisted of standard ring tensile strength and simple beam or flexural strength tests. The strength data were plotted on a base of the brine volume for each test. The test results indicate that the annual sea ice at McMurdo Sound is capable of supporting cargo type aircraft. Snow runways capable of supporting a C-130 aircraft on wheels and providing marginal support to a C-121 can be constructed either with the Peter plow or with the pulvimixer. However, the runway would be reliable only during comparatively low temperatures (
Download or read book Compacted snow Runways in Antarctica written by E. H. Moser and published by . This book was released on 1966 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snow Roads and Runways written by Gunars Abele and published by . This book was released on 1990 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report written by and published by . This book was released on 1962 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snow Compaction Design Criteria and Test Procedures written by E. H Moser (Jr) and published by . This book was released on 1964 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques and equipment are presently available for producing high-strength snow capable of supporting wheeled aircraft with tire inflation pressures up to 75 psi and gross weights up to 75,000 lbs. Current investigations in Antarctic are directed toward increasing the load-bearing capacity of compacted-snow runways on deep perennial snowfields up to 150,000 lbs. Existing criteria are given for the design of compactedsnow roads and runways on annual and perennial snowfields. The limitations of these criteria require that they be applied with judgment. Improved test equipment, instruments, and procedures are being developed to test the properties and trafficability of compacted snow. (Author).
Download or read book Hard surface Runways in Antarctica written by Malcolm Mellor and published by . This book was released on 1988 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snow Compaction written by Andrew Taylor and published by Wilmette, Ill. : Snow, Ice and Permafrost Research Establishment, U.S. Army Corps of Engineers. This book was released on 1953 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improving Snow Roads and Airstrips in Antarctica written by and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antarctic Snow and Ice Studies written by Malcolm Mellor and published by American Geophysical Union. This book was released on 1964 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antarctic Journal of the United States written by and published by . This book was released on 1986 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
