MODEL INVESTIGATIONS OF LININGS ANCHORED TO ROCK

The problem of determining the stress in a lining anchored to a rock mass can be solved experimentally on models of optically active material (photoelastic effect). The method is based on the use of expanded similarity conditions. The boundary conditions are reproduced according to the scheme of reduced 2-dimensional problem with distribution of the anchor rod reactions over the area of contact of the lining with the rock mass within anchoring zones. The determination of the necessary modulus of elasticity of the model plate is described, and the determination of the diagram of the shear forces is detailed. The calculation of the spans between anchors in the invert is also described. The results of investigating one of the variants of the tunnel lining for the tailrace channel of a hydroelectric station are presented as an example. The absence of tensile stresses in the lining and the relatively small values of the compressive stresses permit the conclusion that the adopted design of the lining completely ensures its reliable operation and confirms the possibility of constructing horeshoe-shaped, large-section tunnel linings in strong rocks with high groundwater pressures.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Shagrai, M K
• Publication Date: 1976-9

Media Info

• Features: References;
• Pagination: p. 868-871
• Serial:
  • Hydrotechnical Construction
  • Volume: 9
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Anchor bolts; Anchoring; Boundary value problems; Groundwater; Mass; Mathematical models; Modulus of elasticity; Optical properties; Rocks; Stresses; Tunnel lining
• Uncontrolled Terms: Boundary conditions; Models; Rock mass
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00157188
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 16 1978 12:00AM