GEOLOGICAL AND GEOTECHNICAL CONSIDERATIONS OF SECTIONS OF THE M25

The author summarises papers presented by a number of authors at a January 1984 meeting of the Institution of Highways and Transportation held in London. The history of the planning concepts involved in the evolution of the London orbital road is outlined. A resume is given of the geology of the route from the terrace gravels and soft alluvium near Staines, through chalk with glacial cap, boulder clay, reading beds, chalk and clay with flints over. Problems and considerations associated with the earthworks and the selection of plant used at the construction of three large interchanges are discussed. An account was given of the most intensive structural section containing entrained and open cuttings, a cut and cover tunnel and an approach embankment between reinforced earth walls. The Thames Valley stage crossing a number of water filled gravel pits and disused pits is described, and an account is given of the intensive site investigation of the properties of the gault clay in Kent. Some aspects of research design and construction on the route described include the bell common tunnel. (TRRL)

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  INSTITUTION OF HIGHWAYS & TRANSPORTATION

  6 ENDSLEIGH STREET
  LONDON,   United Kingdom  WC1H 0DZ
• Authors:
  • Newman, R L
• Publication Date: 1984-7

Media Info

• Pagination: p. 18
• Serial:
  • HIGHWAYS & TRANSPORTATION
  • Volume: 7
  • Issue Number: 31
  • Publisher: INSTITUTION OF HIGHWAYS & TRANSPORTATION
  • ISSN: 0265-6868

Subject/Index Terms

• TRT Terms: Alluvium; Chalks; Clay; Compaction; Construction management; Cut and cover tunneling; Earthwork; Embankments; Freeways; Geology; Geotechnical engineering; Glacial soils; Gravel; Gravel pits; Itinerary; Land reclamation; Road construction; Sand
• Uncontrolled Terms: Site investigation
• Geographic Terms: United Kingdom
• ITRD Terms: 4120: Chalk; 4177: Clay; 3686: Compaction; 3395: Cut and cover; 3653: Earthworks; 2801: Embankment; 4053: Geology; 4011: Glacial; 5115: Gravel pit; 699: Itinerary; 2752: Motorway; 3631: Reclamation (land); 4105: Sand; 5722: Site investigation; 8119: United Kingdom
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; I41: General Soil Surveys; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00394577
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 31 1985 12:00AM