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Title: MOLE VERSUS CONVENTIONAL: A COMPARISON OF TWO TUNNEL DRIVING TECHNIQUES
Accession Number: 00228830
Record Type: Component
Abstract: IN NORTHWEST NEW MEXICO THE U.S. BUREAU OF RECLAMATION IS BUILDING THE NAVAJO INDIAN IRRIGATION PROJECT. AS A PART OF THE WATER CONVEYANCE SYSTEM, TWO TUNNELS WERE BUILT. TUNNEL 1, 2 MI LONG, WAS DRIVEN WITH A HUGHES TUNNELING MACHINE. ONE-QUARTER MILE AWAY IS TUNNEL 2, WHICH WILL EVENTUALLY BE 5 MI LONG /ONLY 2 MI HAD BEEN EXCAVATED AT THE TIME OF THIS WRITING/. THE SECOND TUNNEL IS BEING DRIVEN BY CONVENTIONAL METHODS. BOTH TUNNELS ARE IN THE SAN JOSE FORMATION CONSISTING OF SANDSTONE, SILTSTONE, AND SHALE. THE AUTHOR PRESENTS OBSERVATIONS MADE WHILE WORKING IN BOTH TUNNELS. COMPARISONS ARE MADE OF ROCK BEHAVIOR, SUPPORTS, TECHNIQUES, PERSONNEL, AND ADVANTAGES AND DISADVANTAGES OF USING A MOLE. A TUNNELING MACHINE OFFERS THE FOLLOWING ADVANTAGES' NEAR- CONTINUOUS OPERATION, HIGH DAILY FOOTAGE, MINIMUM OVERBREAK RESULTING IN A NEARLY 50 PERCENT REDUCTION IN CONCRETE, LESS PERSONNEL, SAFER OPERATION, LESS SUPPORTS REQUIRED, MINIMUM CLEANUP OPERATIONS, DYNAMITE NOT REQUIRED RESULTING IN INCREASED SAVINGS. DISADVANTAGES ARE' NEEDS LONG SECTION TO PAY FOR ITSELF, CIRCULAR SECTION ONLY, SPECIALIZED OPERATOR REQUIRED, SUPPORTS DIFFICULT TO INSTALL, LONG WAIT FOR DELIVERY, LARGE INITIAL INVESTMENT, MACHINE HAS TO BE DESIGNED FOR TUNNEL BECAUSE OF DIFFERENT DIAMETERS AND GEOLOGIC CONDITIONS, LIMITED TO SOFTER MATERIALS, NEEDS LARGE VENTILATION SYSTEM. /AUTHOR/
Supplemental Notes: Paper sponsored by Committee on Engineering Geology and presented at the 46th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
Monograph Title: Tunneling, geophysical studies and soil-culvert interactions Monograph Accession #: 01410135
Language: English
Authors: Bennett III, Newcomb BPagination: pp 1-8
Publication Date: 1967
Serial: Media Type: Digital/other
Features: Photos
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TRT Terms: Geographic Terms: Subject Areas: Bridges and other structures; Finance; Geotechnology; Highways; Safety and Human Factors; Society
Files: TRIS, TRB
Created Date: Aug 15 2004 2:37AM
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