Roads and rail corridors often need to remain operational while civil and geotechnical teams monitor changing ground conditions around them.
This creates a challenging environment for deformation monitoring. Live traffic, restricted site access, unstable slopes and large monitoring areas can make it difficult to collect consistent ground movement data. At the same time, infrastructure operators need reliable information to assess risk, plan remediation and minimise unnecessary disruption.
Continuous LiDAR deformation monitoring gives engineering teams another way to track ground movement remotely and understand how conditions change over time.
Why deformation monitoring is challenging on active infrastructure
Road and rail infrastructure rarely provides ideal monitoring conditions.
Engineers may need to monitor embankments, cuttings, slopes, retaining structures and road or rail surfaces while vehicles continue to move through the area. Some locations may also present access or safety constraints, particularly when teams suspect slope instability.
These conditions create several practical challenges:
- Live traffic and machinery can interfere with monitoring.
- Unstable areas can restrict safe site access.
- Deformation may develop across a large surface rather than at a single location.
- Monitoring may need to continue for weeks or months.
- Infrastructure operators often need to minimise closures and disruptions.
Despite these challenges, deformation data remains critical to understanding how a site behaves.
Continuous monitoring helps engineers understand changing ground conditions
Identifying movement provides only part of the information engineers need.
Engineering teams may also need to determine where movement occurs, how quickly it develops and whether the rate of deformation changes over time.
Continuous monitoring helps engineers investigate questions such as:
- Where is deformation concentrated?
- Is movement localised or distributed across a wider area?
- Is the deformation rate accelerating or slowing?
- Has the ground reached a more stable condition?
- How has the site responded to stabilisation or remediation works?
A continuous record gives engineers more context than isolated observations alone. Teams can compare deformation over time and identify changes in behaviour that may require further investigation.
This information can support decisions around remediation, monitoring requirements and infrastructure operations.
How GeoLidar supports road and rail deformation monitoring
GeoLidar provides remote, continuous deformation monitoring for roads, rail corridors, slopes and other civil infrastructure.
The system uses LiDAR to scan the monitoring surface and generate high-precision deformation data. GeoLidar can acquire more than 2.5 million measurements in a 25-second monitoring scan and provides millimetre-scale monitoring across a scene-dependent range of up to 50 metres.
GeoLidar also removes one of the challenges associated with monitoring active infrastructure: moving objects.
Its monitoring-surface detection algorithm automatically rejects vegetation, machinery, traffic, bollards, people and other objects from the monitoring data. Engineers can therefore focus their analysis on the surface they need to monitor.
Unlike monitoring approaches that require physical targets, GeoLidar monitors the surface remotely. This approach can reduce the need to install and maintain monitoring targets within difficult or operational areas.
Remote monitoring gives engineers continuous access to deformation data
GeoLidar processes monitoring data onboard and automatically synchronises it with the cloud. Engineers can remotely access the monitoring information instead of repeatedly visiting the site to retrieve data.
The system can also issue alerts when deformation exceeds configured thresholds.
These capabilities allow teams to maintain an ongoing record of ground movement and review changing conditions as they develop.
For active roads and rail corridors, remote monitoring can also reduce the amount of site interaction required to maintain the monitoring program.
Monitoring deformation before and after stabilisation works
Deformation monitoring also plays an important role after engineers begin remediation.
Completing stabilisation works does not automatically show how the ground has responded. Continued monitoring allows teams to compare deformation before, during and after intervention.
Geobotica demonstrated this approach during a monitoring project at Springbrook Road in Queensland, Australia.
Following significant rainfall and a landslip, Geobotica deployed GeoLidar to monitor an old dry-stacked stone wall and the road above it.
GeoLidar detected deformation of the wall at more than 2 mm per day and also identified movement at the road crest. Recorded movement ranged from approximately 2 mm across areas of the road surface to as much as 30 mm on the vertical wall.
The monitoring data helped the project team investigate the site and undertake remedial works. These works included clearing a blocked culvert and installing temporary slope support.
GeoLidar then continued monitoring the site.
Within 48 hours of the temporary support works, the road surface stabilised and deformation velocity across the road and cliff face decreased. The team continued monitoring while engineers developed a permanent geotechnical ground-support plan.
This continuous record allowed the project team to observe how the site responded after intervention.
Identifying where ground movement is occurring
Understanding the spatial distribution of deformation can also help engineers focus their investigations and remediation efforts.
Geobotica demonstrated this capability during monitoring at Tamborine Mountain Road.
The project team wanted to determine whether the road surface continued to move, whether movement affected one area or the wider slope, and whether deformation accelerated or slowed over time.
GeoLidar identified a tension-crack zone that extended approximately 60 metres. Within that area, a seven-metre section moved at a greater rate than the remainder of the road.
The system also showed that other areas deformed much more slowly, at approximately 0.5 mm per week.
These differences helped engineers understand how deformation varied across the site and supported the prioritisation of stabilisation works.
From ground movement data to engineering decisions
Effective infrastructure deformation monitoring needs to provide engineers with useful information over time.
GeoLidar allows engineering teams to:
- Monitor deformation across roads, rail corridors and surrounding slopes.
- Identify areas of concentrated movement.
- Track changes in deformation rate.
- Compare conditions before and after stabilisation works.
- Monitor movement against defined thresholds.
- Receive automated deformation alerts.
- Access monitoring information remotely.
Together, these capabilities give engineers a continuous record of how ground conditions change.
For road and rail infrastructure, that information can support geotechnical assessments, remediation planning and decisions around ongoing monitoring and operational restrictions.
Continuous deformation monitoring while infrastructure remains operational
Managing geotechnical risk around active infrastructure requires both reliable data and an understanding of how conditions change over time.
Continuous LiDAR deformation monitoring gives engineers greater visibility across the monitoring surface while reducing reliance on physical monitoring targets and repeated site access.
GeoLidar combines millimetre-scale deformation monitoring, automated surface detection, remote data access and threshold alerts to help civil and geotechnical teams monitor changing ground conditions across operational infrastructure.
Learn more about GeoLidar and how it can support deformation monitoring for roads, rail corridors, slopes and civil infrastructure at Geobotica.com.
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