Client

Network Rail

Value

£1.25m

Timescale

4 Months

Location

Kendal, Cumbria

The Project

The site is situated in the Lune Gorge adjacent to the M6 motorway and the River Lune approximately 1500m south of Tebay Yard. The slopes are situated on sidelong ground with the motorway to the west and the river to the east.  The earthworks consist of overstep (35 to 40 degrees) embankment slopes which are between 7 and 12m in height.

There is an over high ballast shoulder present and there are numerous smaller issues on the slope faces such as localised slumping and hummocky ground.  The S&T troughing is tilted/disturbed in a number of places along the length of the earthworks in question.

View Gallery
View Gallery

To bring the earthwork from a poor to serviceable condition, the scope of works comprised of:

  • Installation of a haul road circa 1m long
  • De-vegetation of the embankment
  • Installation of toe berms within 2 No. gullies to enable the re-grade using 1A granular fill

 

  • Re-grade of the existing railway embankment using 6B rock fill
  • Installation of a safe cess walking route and realignment of the existing trough route
  • Facing of the toe berms with site won material
  • Redirecting drainage channels to the existing outfall

The first stage of the scheme was to install the haul road to access the site; this involved the installation of circa 900 track way panels due to the rural location of the site.  At the site there were two large gullies present, hence to carry out the re-grade these required in filled/profiled with a toe berm to create a haul road from where the embankment re-grade could be carried out from and enable the shallower slope angle.

Once the toe berms were installed, the embankment within the railway boundary could be re-graded with 6B rock fill and the trough route aligned. Part of the design was to use the excavated material from benching to face the toe berms, this meant there was no requirement to take spoil off site. Part of the works were also to divert the existing drainage down the berms and formalise this into a new culvert to the outfall into the River Lune.

The project was able to celebrate success and demonstrate best practice within the following areas:

  • No spoil was removed from site due to design process efficiencies
  • The project was delivered under budget by designing out the need to extend two of the culverts and provide additional support to a third
  • Installing good quality haul roads and installing the toe berms in dry weather helped to prevent delays in the programme

20,000 tonnes
engineering fill imported

900 track way
panels used

Find out how we can help you

To find out more about how we can help you deliver your project contact Paul Marrs on on 01228 590444.

RISQS
UVDB
Safe contractor approved
ARTP

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