Projects

Project: Glen Tarras

Location:
B6318, Langholm, Dumfries & Galloway
Client:
Dumfries & Galloway Council
Status:
Completed (June 2019)
Cost:
~£1M

the commission

In December 2015, following a period of exceptionally wet weather, a landslip occurred which damaged the B6318 between Tarras Bridge and A7/Skipper’s bridge. The landslip displaced several thousand m3 of material, ruptured a high pressure water main, disrupted natural drainage lines and rendered the route impassable and impacted property below the slope. The event occurred in an area with a history of slope instability in a complex geological setting.

The road had been closed since the date of the landslip, however the Client (Dumfries and Galloway Council) needed it to be re-opened as the road is frequently used as an alternate route between Canonbie to Langholm when the A7 is closed.  Remediation and re-instatement works were required to enable the road to be
re-opened.

our input

Following the ground investigation and subsequent slope assessment, Fairhurst scoped the following required works to enable the reopening of the road:Fairhurst Glasgow scoped and managed a Ground Investigation to gather information on the geotechnical properties of the superficial deposits and bedrock at the landslip and along a 300m stretch of adjacent road and land.

  • Retaining solution to allow the rebuild of the failed road section
  • Drainage solution on the failed slope and 300m of road verge
  • Road retention systems at two locations of further areas of slope stability concern
  • General surfacing and reinstatement works.

Fairhurst prepared the civils contracts document and managed the tender process for the works under Public Contracts Scotland (PCS) which out to tender in October/November 2018.

Site works began in early January 2019, with Fairhurst acting in a site supervision and project management role for the NEC3 Options A Contracts. Site works were completed in late May 2019.

our Value

All design services were provided via the Fairhurst Glasgow office, including geotechnical, drainage, civil & structural inputs. This ensured a successful reinstatement and remediation project in spite of the complex constraints.

Discipline
Civil, Geotechnical and Environmental, Water Engineering
Sector
Infrastructure