meld je nu aan voor de terracarta branchemiddag
op woensdag 19 november
- 19 november
- Thema maakbaar ontwerp
- Railcenter Amersfoort
- 13:00 - 18:00
Confidence in Directional Drilling for Complex Rail Projects
Reliable information about the subsurface is essential for rail projects, especially when planning, safety, and design choices depend heavily on what lies below ground level. In December 2025, Movares engaged us to determine the presence and location of directional boreholes at the Eindhoven rail yard.
The challenge:
Uncertainty Amid a Tight Schedule
According to the available KLIC information, there were supposed to be three directional boreholes at the project site. In practice, however, doubts arose regarding the actual number, the location, and the method used. At the same time, ProRail had a tight schedule, and the site was difficult to access.
It had already been noted during the bidding phase that realigning the boreholes might be necessary due to their theoretical location. At first, gyroscopic surveying did not seem feasible, which made the challenge even greater.
The process:
From verification to full insight
We began with a thorough preliminary investigation to determine the number of boreholes present. By combining a desk study with field data, we determined that there were actually two directional boreholes instead of three.
The following are the drill holes:
- Surveyed using radio detection: The directional drilling operations were first surveyed using radio detection to verify the location and route and to compare them with the available theoretical information. This provided certainty regarding the course of the boreholes in relation to the existing underground infrastructure.
- Followed by gyroscopic surveying: After verification, it was decided to use gyroscopic surveying, which captured a complete and accurate profile of the boreholes. This method made it possible to reliably map depth, gradient, and deviations, despite earlier uncertainties regarding its feasibility.
This phased approach made it possible to gradually eliminate uncertainty and build a reliable dataset.
The solution:
reliable data as the basis for design
Ultimately, two directional boreholes were fully mapped, to a depth of 14 meters and over a total length of 188 meters. The result is a complete and reliable profile of the subsurface conditions.
This information formed the basis for the final design of a Rail Deployment Site (RIP). Thanks to the insights gained, the design process was completed without delays or additional risks.
You also need certainty when it comes to
Complex underground issues?
In complex infrastructure projects, uncertainty about the subsurface is often a decisive factor. TerraCarta supports clients by verifying existing data, eliminating uncertainties, and reliably mapping underground infrastructure—even under time pressure and in challenging conditions.
Contact us or find out how our approach can benefit your project.
View here
The Results
Want to know more?
Would you like to learn more, or are you curious about what we can do for you? Feel free to contact us—we’d be happy to tell you more!