In 1973 the tunnels division of the Transport and Road Research Laboratory (TRRL) began a programme of mechanized tunnelling trials in lower chalk at Chinnor, Oxfordshire. Observations during tunnelling started on site in January 1974 and were completed in April 1975. The work described in the paper is based on some of the measurements taken during the preliminary stages of the tunnelling programme and was performed under the auspices of a research contract from the TRRL to the University of Durham. The paper is aimed at evaluating the overall response of the ground to tunnel construction. Both the short-term ground movements resulting from reaction ring jacking tests and the long-term movements resulting from tunnel excavation are examined, in order to assess the influence of the reaction ring and support methods on the behaviour of the discontinuous rock mass. In addition a theoretical stress analysis of the tunnelling situation is undertaken to permit an examination of the way in which the actual ground behaviour deviates from the predictions of an idealized theoretical model. (A). /TRRL/

Media Info

  • Features: Figures; References;
  • Pagination: p. 23-39
  • Serial:
    • Volume: 61

Subject/Index Terms

Filing Info

  • Accession Number: 00137502
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 6 1976 12:00AM