DESIGN OF THE RETAINING WALLS FOR THE M25 CUT AND COVER TUNNEL AT BELL COMMON

The M25 motorway forms part of the London orbital road and at two locations north of London (Holmesdale, Waltham Cross, and Bell Common, Epping) it is constructed in cut and cover tunnels for environmental reasons. The Bell Common tunnel is underlain by London clay and the design of the embedded cantilever retaining walls revealed considerable uncertainties in the assessment of the bending moments. Moreover application of the stability requirements of the Code of Practice (CP2) gave rise to excessive wall penetrations. Part I of the paper describes the initial design approach to the retaining walls and highlights the lack of guidance that exists for this type of construction. Part II describes the results of a study that was commissioned to assess the soil-structure interaction of the retaining walls at Bell Common together with a review of stability criteria. The decisions leading to the final design are then described. (TRRL)

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 495-512
  • Serial:
    • GEOTECHNIQUE
    • Volume: 34
    • Issue Number: 4
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00395098
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 31 1985 12:00AM