Download or read book Tunnel Mechanics by John F Abel written by John F. Abel and published by . This book was released on 1966 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tunnel Mechanics written by John F. Abel and published by . This book was released on 1967 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ice Tunnel Closure Phenomena written by John F. Abel and published by . This book was released on 1961 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanics of closure, exhibited by ice tunnels, can be understood by considering the ice as a viscous solid. The viscous solid will flow, when subjected to a force, at a rate dependent on the magnitude of the force, the area of relief open for flow, and the apparent viscosity of the viscous solid. In the case of the ice tunnels, the force inducing the flow is the weight of the overburden; the area of relief open for flow is the tunnel opening; and apparent viscosity is the resistance to flow exhibited by the ice. The closure of a rectangular opening made in ice was measured. Maximum closure occurs at the center of unsupported roof, wall, or floor spans. The vertical closure rate decreases negligibly approximately 2% from the center of a room to approximately 6 ft from the wall. From the point about 6 ft from the wall to the wall, the closure rate decreases about 30%. Approximately 30% of vertical closure at the center of the span is due to flexure of the floor and roof. The remaining 70% is due to shortening of the wall height; the major portion of this wall closure occurs at the bottom of the wall. Over 80% of closure due to flexure of the floor and roof results from flexure of the floor. (Author).

Download or read book Tunnel Mechanics written by John F. Abel and published by . This book was released on 1967 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Stability During Construction of Three Large Underground Openings in Rock written by Edward J. Cording and published by . This book was released on 1968 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three large rock-bolted underground cavities were constructed at the Nevada Test Site. Two of the cavities, approximately 100 feet in diameter and 140 feet high, were constructed at a depth of 1300 feet in a very weak tuff of excellent rock mass quality. The third cavity, approximately 60 feet in diameter and 80 feet high, was constructed at a depth of 350 feet in a jointed granite of high intact strength and fair to good rock mass quality. The stability of the cavities was monitored throughout construction by measuring rock displacements, observing fractures in near-surface rock, and observing the behavior of the rock-bolt support system. Supporting field and laboratory tests were performed in order to evaluate intact and in-situ properties of the rock mass. Radial movement of the cavities was measured using extensometers anchored at various depths in holes drilled from the cavity surface. Displacement versus depth profiles were used to determine the depth at which rock movement was concentrated. By comparing rock movement with excavation and support progress, a continual estimate of the cavity stability was obtained. Large displacements, or large rates of displacement, were indicative of potentially unstable behavior. Displacements were compared with displacements predicted from elastic theory, using a finite element solution and simple closed solutions. (Author).

Download or read book Abstracts of North American Geology written by Geological Survey (U.S.) and published by . This book was released on 1967-07 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineering Geologic Geophysical Hydrologic and Rock mechanics Investigations of the Straight Creek Tunnel Site and Pilot Bore Colorado written by Geological Survey (U.S.) and published by . This book was released on 1974 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National union catalog 1968 1972 written by and published by . This book was released on 1973 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National Union Catalogs 1963 written by and published by . This book was released on 1964 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of North American Geology written by and published by . This book was released on 1970 with total page 1300 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.

Download or read book Geological Survey Bulletin written by and published by . This book was released on 1973 with total page 1324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Union Catalog written by and published by . This book was released on 1968 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.

Download or read book Library of Congress Catalogs written by Library of Congress and published by . This book was released on 1970 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalog of Books and Reports in the Bureau of Mines Technical Library Pittsburgh Pa written by United States. Bureau of Mines. Technical Library, Pittsburgh and published by . This book was released on 1968 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Checklist of State Publications written by Library of Congress. Exchange and Gift Division and published by . This book was released on 1967 with total page 1046 pages. Available in PDF, EPUB and Kindle. Book excerpt: June and Dec. issues contain listings of periodicals.

Download or read book Monthly Check list of State Publications written by Library of Congress. Division of Documents and published by . This book was released on 1967 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tunnel Support Loading Caused by Rock Failure written by Jaak Joseph K. Daemen and published by . This book was released on 1975 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: