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 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 Special Report written by 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 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 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 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 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 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 HRIS Abstracts written by National Research Council (U.S.). Highway Research Information Service and published by . This book was released on 1989 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geotechnical Abstracts written by and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1989 with total page 1106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nouvelles Acquisitions written by Institute for Research in Construction (Canada). Information Service and published by . This book was released on 1991 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Host Bibliographic Record for Boundwith Item Barcode 30112050443578 and Others written by and published by . This book was released on 2013 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Polar and Glaciological Literature written by and published by . This book was released on 1989 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1989 with total page 1708 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Soil and Rock Properties written by P. J. Sabatini and published by . This book was released on 2004-10-01 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document presents state-of-the-practice information on the evaluation of soil and rock properties for geotechnical design applications. This document addresses the entire range of materials potentially encountered in highway engineering practice, from soft clay to intact rock and variations of materials that fall between these two extremes. Information is presented on parameters measured, evaluation of data quality, and interpretation of properties for conventional soil and rock laboratory testing, as well as in situ devices such as field vane testing, cone penetration testing, dilatometer, pressuremeter, and borehole jack. This document provides the design engineer with information that can be used to develop a rationale for accepting or rejecting data and for resolving inconsistencies between data provided by different laboratories and field tests. This document also includes information on: (1) the use of Geographical Information Systems (GIS) and Personal Data Assistance devices for the collection and interpretation of subsurface information; (2) quantitative measures for evaluating disturbance of laboratory soil samples; and (3) the use of measurements from geophysical testing techniques to obtain information on the modulus of soil. Also included are chapters on evaluating properties of special soil materials (e.g., loess, cemented sands, peats and organic soils, etc.) and the use of statistical information in evaluating anomalous data and obtaining design values for soil and rock properties. An appendix of three detailed soil and rock property selection examples is provided which illustrate the application of the methods described in the document.

Download or read book Guidelines for Soil Description written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soils are affected by human activities, such as industrial, municipal and agriculture, that often result in soil degradation and loss. In order to prevent soil degradation and to rehabilitate the potentials of degraded soils, reliable soil data are the most important prerequisites for the design of appropriate land-use systems and soil management practices as well as for a better understanding of the environment. The availability of reliable information on soil morphology and other characteristics obtained through examination and description of the soil in the field is essential, and the use of a common language is of prime importance. These guidelines, based on the latest internationally accepted systems and classifications, provide a complete procedure for soil description and for collecting field data. To help beginners, some explanatory notes are included as well as keys based on simple test and observations.--Publisher's description.