ECML WALLYFORD SUBSIDENCE - PILED SLAB REMEDIAL WORKS

A section of the East Coast Main Line railway at Wallyford to the east of Edinburgh has been affected by track settlement for over 100 years. The site is approximately 250m in length and lies on a section of straight track where the line speed was reduced in recent years from 200km/h to 60km/h to mitigate risks associated with track settlement. In 1994 shallow and previously unrecorded coal workings were discovered beneath the site. These workings were treated by grout injection but further ground movement occurred after completion of these works. Additional investigations were undertaken in 1999 to provide information to allow a detailed ground model to be developed in order to assess the reasons for the ongoing movement. Based on the ground model developed in 1999 a feasibility study was commissioned to consider various options to resolve the track settlement problems. On completion of the feasibility study Railtrack Scotland and the project team concluded that the preferred permanent solution was to construct a piled ground slab on the line of the existing railway. To facilitate the construction of the piled ground slab without affecting railway operations, a temporary diversion of the East Coast Main Line onto an adjacent area (also underlain by further shallow mine workings) was incorporated into the scheme. To construct the preferred solution Railtrack Scotland entered into a partnering agreement with Kvaerner Construction Limited (now Skanska Construction Limited) who retained Donaldson Associates as civil and geotechnical designer. The project involved detailed assessment and further investigation of the ground conditions and detailed geotechnical risk analysis / assessment to provide cost effective temporary diversion and permanent slab solutions. The mining subsidence problems which affected the site are described, together with the ground investigations undertaken and the incorporation of the geotechnical information into the ground model. The options considered to resolve the problems and the basis of design for the temporary diversion and permanent slab solutions are also presented. The project was completed successfully in October 2000 with the line speed restored to 200km/h for the first time in two years. For the covering abstract see ITRD E123713.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0947644458
• Corporate Authors:

  ENGINEERING TECHNICS PRESS

  46 CLUNY GARDENS
  EDINBURGH,   United Kingdom  EH10 6BN
• Authors:
  • CANNON, W
  • GARLAND, R
  • WILDE, G
• Publication Date: 2001

Language

• English

Media Info

• Features: References;
• Pagination: 10 p.
• Serial:
  • PROCEEDINGS OF THE INTERNATIONAL CONFERENCE RAILWAY ENGINEERING 2001, HELD LONDON, UK, 30 APRIL - 1 MAY 2001 - CDROM
  • Publisher: ENGINEERING TECHNICS PRESS

Subject/Index Terms

• TRT Terms: Conferences; Ground settlement; Mines; Railroad tracks; Repairing; Soil mechanics; Soil stabilization; Support piles
• ITRD Terms: 8525: Conference; 5117: Mine; 3399: Pile; 1062: Railway track; 3635: Repair; 5792: Settlement; 5755: Soil mechanics; 3689: Soil stabilization
• Subject Areas: Geotechnology; Railroads;

Filing Info

• Accession Number: 00985507
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-947644-45-8
• Files: ITRD
• Created Date: Feb 4 2005 12:00AM