Navigating a changing landscape

Ireland has a diverse and variable landscape, which means expanding the rail network will involve adapting to a wide range of geological conditions. For civil engineers and contractors, there’s a lot to consider as this variability can directly influence how new routes are delivered.

When it comes to laying out new railway tracks, ensuring the ground conditions are level and robust enough to carry consistent heavy loads is key to long-term performance and resilience. Weakened ground can cause differential settlement, while groundwater at embankments can also erode subsoils, resulting in uneven tracks.

Upgrading existing railway lines can be a little more complicated as contractors may need to work alongside operational infrastructure and existing structures. So, in addition to the ground conditions, contractors need to consider site access and how much disruption is likely to be caused by the works.

Why investigating ground conditions matter

Ground investigations help to build a clearer picture of what the site conditions are like before construction work starts. Investigations can involve assessing soil conditions, groundwater levels and researching previous land use.

The results of the assessment can then help project managers and contractors make informed decisions about route design and construction methods. Additionally, it can also help identify the areas where further investigation or ground improvement may be needed before work can begin.

Identifying potential issues early reduces the risk of costly ground-related problems later down the line and help support better planning for major rail programmes. This can reduce the chances of delays or extensive repair works during construction. 

Improving the ground with targeted solutions

Once ground investigations identify a structural issue or ground movement, the next step is determining how it should be managed. Ground improvement techniques, such as those offered by Mainmark, can help provide targeted solutions to address the specific challenges.

Choosing the appropriate ground improvement or remediation work depends on several factors such as:

• Underlying cause of the issue

• Site access

• Soil conditions

• Loads involved

For large-scale, complex rail networks, conditions can change significantly across different sites all along the route, particularly if the train route runs from urban areas to the countryside.

In some cases, Mainmark’s non-invasive solutions such as resin injection, screw piling and JOG computer-controlled grouting can provide a suitable alternative solution to underpinning. These modern techniques quickly fill voids, strengthens the ground and, if needed, re-level track beds or surrounding structures. Projects can often be turned around within days, with minimal disruption to construction schedules.

For asset owners and contractors, seeking professional advice from ground engineering specialists helps manage ground-related risks throughout the project lifecycle.

Ensure long term resilience in Ireland’s railways

Delivering the proposed Review means building resilient infrastructure now to meet the demands of the future. That means managing ground conditions is an essential part of the construction process.

Understanding the underlying ground conditions is crucial in successfully delivering large, complex rail projects. What’s even more important is that ground conditions are assessed as early as possible in the programme. Identifying a potential issue early can help manage risk and build the foundations for a more resilient rail network.

To find out more about how Mainmark can strengthen ground conditions for infrastructure projects, speak to an expert today.