Subgrade erosion or mud pumping can result in loss of line and level and the creation of mud holes which requires extensive maintenance and monitoring to keep under control.

Tracktex, which is approved by Network Rail in the UK and has pending AREMA approval in the US, is a long term solution which prevents the mud pumping phenomenon of fine grained particles in the formation layer beneath the ballast being mobilised upwards into the ballast layer above.

Tracktex is a proven mud pumping solution which has been used around Australia and New Zealand to deliver significant reductions in maintenance cycles on affected sections of track.

Tracktex has been proven to increase trackbed maintenance intervals on sections affected by pumping failure by more than 25 times, providing significant savings over any available alternative.

Function

Tracktex allows subgrade pore-water pressure to dissipate whilst still preventing fine soil particles migrating upwards to contaminate the ballast in passenger and freight rail applications. In addition, the composite conforms to the formation profile and thus minimises the potential for pockets where slurry could accumulate.

Applications

Tracktex has been created to address the extensive and expensive track and ballast deterioration problem caused by ‘Erosion Pumping Failure’ or mud pumping.  When installed at the ballast formation interface it prevents rain water penetrating through to the underlying deposits whilst under load, allowing a controlled upward movement of water through capillary action and also filtering and retaining any fine soil particles, in situ, during the process.

Advantages

  • Reduce maintetance costs associated with mud pumping, supported by years of local and international installations
  • Conforms to surface depressions in the formation layer preventing the creation of slurry pockets
  • Fast installation rates reducing the construction costs and increasing the coverage for a given possession time
  • UKAS accredited laboratory testing supoprted by local and international rail authority approvals
  • Rolls are manufactued locally, allowing bespoke production, including custom roll dimensions to suit your project requirements.

Installation

The standard specified and installed width of Tracktex is 4m laid directly onto a prepared formation avoiding any lapping up the sides of the excavation. This should be achieved wherever possible.

Where the above is not achievable typically because of width restrictions, a standard 4m roll can be lapped up one side of an excavation. This should only be conducted where work has been carried out to provide an adequate fall or suitable gradient that creates a clear drainage path to a suitable track drainage system installed on the opposite edge for runoff e.g. slotted or perforated pipe or a granular based drainage channel.  Tracktex is then installed up to the edge of this drain.  This procedure would also apply in tunnels and other structures where there is a restricted width on track.

Any further reduction in the specified width of Tracktex should be approved by the relevant Railway Design Engineer. 

The roll end to end overlapping detail must be installed at 1.5m and in the direction, as illustrated, in the diagram above. Tracktex™ shall be protected with a minimum of 150mm of ballast before any construction traffic is allowed to run over it.

Latest Projects

Friday, 26 May 2017 - 12:00pm
The existing rail formation is removed and excavated to 300 mm deep