Download or read book Evaluation of Several Auger Bits in Frozen Fine grained Soils Asphalt and Concrete written by Paul V. Sellmann and published by . This book was released on 1988 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drill Bits for Frozen Fine grained Soils written by Paul V. Sellmann and published by . This book was released on 1986 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful drill bits for use in frozen sediments have certain characteristics that are not commonly found in commercial bits used for unfrozen soils and rocks. In frozen sediments, drilling characteristics and optimum bit design vary, depending on grain size, ice content, and temperature of the material. Drills for frozen fine grained material (silt and clay) have specific requirements that differ from those for other frozen soil types. Even with restriction of fine-grained materials, drilling characteristics vary with temperature and ice volume. Soils that are only a few degrees below freezing can cause more problems than similar materials at somewhat lower temperatures because of different fracture and transport characteristics. Our approach had been to work toward optimum efficiency, with special emphasis on reducing thrust and torque requirements for light weight drills. Important features of drills that perform well in frozen fine-grained materials include: (1) full face cutting, (2) a pilot bit that can cut and clear its cuttings, (3) appropriate cutter angles (adequate clearance angles and positive rake), (4) sharp but durable cutters, (5) unobstructed flow paths for chip clearing, and (6) stabilizing features for smooth running. Examples of successful bits are discussed and illustrated. Some were built of modified at CRREL, while others are of commercial manufacture. Keywords: Cold regions; Permafrost; Drilling; Drills; Cutters.
Download or read book Auger Bit for Frozen Fine grained Soil written by Paul V. Sellmann and published by . This book was released on 1986 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Auger bits 6.5 in. (165 mm) and 9.5 in. (241 mm) in diameter were modified to satisfy military and general engineering requirements for producing holes in frozen soil. A commercial bit was selected since it appeared to need only minor modification. Penetration tests were run in frozen fine-grained soils, one type containing some gravel. Modifications, which primarily involve changes in cutter relief angles, substantially improves performance. Penetration rates were as high as 5 ft/min (1.5m/min), compared to 0-1.4 ft/min (0.04 m/min) for the unmodified bits. Keywords: Augers; Drill bits; Drill design; Frozen soil.
Download or read book Evaluation of Several Auger Bits in Frozen Fine Grained Soils Asphalt and Concrete written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several auger bits were evaluated for drilling in frozen ground, asphalt, and concrete to determine bit performance in a wide range of materials. Promising bits in the 9- to 10-in. (229- to 254-mm) diameter range were used with varying success depending on bit configuration. Bits included finger bits and a two-wing bit with continuous cutters. It was possible to penetrate all the test materials, with performance depending on bit parameters and characteristics of the drill rig. Drill rig specifications are important because of the high torque and vertical thrust required for drilling in these hard materials. The finger bits have an advantage over bits with fixed cutters (soldered to the bit) for this demanding drilling, since damaged and dull cutters can be rapidly replaced in the field without special equipment. Several smaller-diameter bits 3.5 in. (89 mm) to 6.5 in. (165 mm) were also tested in frozen ground only. Keywords: Auger bits, Drill bits, Drill performance, Frozen ground.
Download or read book General Considerations for Drill System Design written by Malcolm Mellor and published by . This book was released on 1975 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilling systems are discussed in general terms, component functions common to all systems are identified, and a simple classification is drawn up in order to outline relations between penetration, material removal, hole wall support, and ground conditions. Energy and power requirements for penetration of ice and frozen ground are analyzed for both mechanical and thermal processes. Power requirements for removal of material and for hoisting of drill strings are considered, and total power requirements for complete systems are assessed. Performance data for drilling systems working in ice and frozen ground are reviewed, and results are analyzed to obtain specific energy values. Specific energy data are assembled for drag-bit cutting, normal impact and indentation, liquid jet attack, and thermal penetration. Torque and axial force capabilities of typical rotary drilling systems are reviewed and analyzed. The overall intent is to provide data and quantitative guidance that can lead to systematic design procedures for drilling systems for cold regions.
Download or read book Special Report written by and published by . This book was released on 1992 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interim Report on Core Drilling in Frozen Ground written by Mikael Juul Hvorslev and published by . This book was released on 1957 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report written by and published by . This book was released on 1986 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geotechnical and Exploration Drilling in the Polar Regions written by Pavel G. Talalay and published by Springer Nature. This book was released on 2023-01-01 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive review of drilling technologies in the polar regions, from the portable drilling equipment for shallow sampling and coring, to heavy drilling equipment for deep onshore and offshore drilling. Particular attention is given to safe drilling methods in permafrost. In recent years, interest in drilling in the polar regions has increased under the pressure of the geopolitical “rush” and the undiscovered resource potential. In addition, borehole monitoring of permafrost thermal states is urgently needed to obtain evidence of climate change. The book focuses on the latest drilling technologies but also discusses the historical development of sampling, and drilling tools and devices, over the last 60–70 years providing valuable insights into a way forward and future possibilities.
Download or read book Geological Survey of Canada Open File 932 written by and published by Natural Resources Canada. This book was released on with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamental Concepts for the Rapid Disengagement of Frozen Soil written by Foster-Miller Associates and published by . This book was released on 1973 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Glaciological Data written by World Data Center A for Glaciology and published by . This book was released on 1977 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Introduction to Frozen Ground Engineering written by Orlando B. Andersland and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frozen Ground Engineering first introduces the reader to the frozen environment and the behavior of frozen soil as an engineering material. In subsequent chapters this information is used in the analysis and design of ground support systems, foundations, and embankments. These and other topics make this book suitable for use by civil engineering students in a one-semester course on frozen ground engineering at the senior or first-year-graduate level. Students are assumed to have a working knowledge of undergraduate mechanics (statics and mechanics of materials) and geotechnical engineering (usual two-course sequence). A knowledge of basic geology would be helpful but is not essential. This book will also be useful to advanced students in other disciplines and to engineers who desire an introduction to frozen ground engineering or references to selected technical publications in the field. BACKGROUND Frozen ground engineering has developed rapidly in the past several decades under the pressure of necessity. As practical problems involving frozen soils broadened in scope, the inadequacy of earlier methods for coping became increasingly apparent. The application of ground freezing to geotechnical projects throughout the world continues to grow as significant advances have been made in ground freezing technology. Freezing is a useful and versatile technique for temporary earth support, groundwater control in difficult soil or rock strata, and the formation of subsurface containment barriers suitable for use in groundwater remediation projects.
Download or read book Proceedings written by and published by . This book was released on 1991 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Permafrost Bibliography Update 1988 1992 written by and published by . This book was released on 1993 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report Corps of Engineers U S Army Cold Regions Research and Engineering Laboratory written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drilling Symposium written by and published by . This book was released on 1957 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
