A support technique characterized by reliance on the carrying capacity of the rock or surrounding soil rather than on heavy wood, steel, or concrete support systems has evolved during the last decade in Europe. Carrying capacity is mobilized by thin, semirigid linings adhering directly to the surround (i.e., usually shotcrete) and system anchoring. Frequent measurements, experience, and a thorough theoretical understanding of time-deformation-stress relations of the rock or soil surround, of the measures to be provided, and their interaction are required to achieve optimum rock loads, made possible by the most advantageous stress distribution within the mostly self-carrying surround. Recent theoretical and experimental advances, and recent site experience at two large tunnel projects, are described.

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Filing Info

  • Accession Number: 00057512
  • Record Type: Publication
  • Source Agency: American Society of Civil Engineers
  • Report/Paper Numbers: #9836 Proc Paper
  • Files: TRIS
  • Created Date: Aug 28 1974 12:00AM