The foundation
Trackbed Stabilization

The rapid passage of trains applies dynamic loads to the soil resulting in very intense compression and decompression cycles. The foundation, being thus subjected to fatigue stresses, can undergo fracturing up to the point of collapse. Under these conditions, both very thick layers of aggregate, and frequent and expensive maintenance are required and although these maintenance costs are high, by far the most important cost factor is the reduction in revenue caused by the disruption of services. RK4 laid on the base of the railway ballast, constrains the aggregate by laterally confining it, and creating the necessary trackbed stiffness. The aggregate’s thickness may therefore be reduced to give construction cost savings. 

RK4 uses RK1 needlepunched nonwoven which is specified by engineers due to its robustness and its proven ability to function in the most demanding conditions – especially important under dynamic loading beneath track ballast. Extensive testing has demonstrated RK1’s class leading robustness and long service life under dynamic loading conditions. This is due to it’s high puncture resistance, high elongation to break, superior abrasion resistance, excellent filtration characteristics at all strains and high UV resistance. 

Soil filtration

RK4 allows the installation of both the geotextile component and the grid at the same time, giving a product that will function for ballast confinement, soil filtration and separation. 

It should be noted that stabilization alone does not solve mud-pumping as the slurry particles will still move through the layers to contaminate the ballast. However geogrids and geogrid composites are often used as stabilization in conjunction with TrackTex to treat areas where subgrade pumping occurs as the systems are compatible. 

Preventing Mud Pumping, Ensuring Track Stability

Comprehensive Support Delivers Trackbed Performance

At GEOfabrics, we provide technical support to help you get the most out of TrackTex and address the cause of mud pumping. This ensures the stability and performance of your tracks. Our team of experts utilizes advanced techniques and technologies to deliver effective solutions tailored to your specific needs

Professional Development Hours

GEOfabrics continuing education sessions provide technical training on specifying and using TrackTex. These sessions contribute to PDH hours.

Trackbed Stabilization

Geosynthetics are widely used as a way to improve ballast performance under railways. GEOFabrics RK4 is a geocomposite comprising a stabilizing geogrid bonded to our RK1 needlepunched non-woven sep...

Symptoms of Mud Pumping

The symptoms of Mud Pumping are similar to those of life expired ballast, i.e. wet spots appearing at the surface of the ballast accompanied by rapid deteriorating of track geometry. However, from ...
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Discover Our Case Studies

Explore our latest case studies showcasing our expertise.

Diamond Crossing Replacement with TrackTex

In Detroit Lakes, MN, a frequently trafficked diamond crossing operated by Canadian Pacific and BNSF had experienced frequent fouling because of mud-pumping. Mud pumping results in ballast failure,...

Coos Bay Line Tunnel 21 Rehabilitation

The Coos Bay Rail Line is owned and operated by the Port of Coos Bay. It spans 134 miles from Coquille Oregon to Eugene Oregon, providing connections to the North American rail network for manufact...

Crossing Repair and Replacement using TrackTex

This road crossing had been replaced and repaired multiple times due to issues with track geometry movement and differential settlement of the highway and railroad. Union Pacific Engineers assessed...