The Unified Rock Classification System (URCS) is used by a large organization, such as the Forest Service of the U.S. Department of Agriculture, to handle projects of all sizes that involve rock. Existing geologic classifications have not provided the necessary information. The usefulness of URCS is that the pertinent natural conditions related to design and strength are emphasized and can be read at a glance, which allows an immediate assessment. A decision is then made as to the appropriate level of detail and the extent of investigation needed to complete or evaluate the project. Efforts can be concentrated toward the rock conditions that are most critical to the project. The data base that covers rock conditions is, in many instances, too detailed for collective analysis. URCS is a type of engineering shorthand to convey maximum design and construction information and omit specific details unrelated to a general evaluation. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 9-14
  • Monograph Title: Rock classifications and horizontal drilling and drainage
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00335183
  • Record Type: Publication
  • ISBN: 0309031710
  • Files: TRIS, TRB
  • Created Date: Sep 16 1981 12:00AM