When you want to know if and how much the subsurface is moving at a particular depth, an extensometer provides the solution. This measuring instrument is inserted freely into a borehole and firmly anchored at the desired depth. In this way, a specific soil level can be monitored independently of the layers above it.
Mechanical extensometers
A rod or wire is anchored at depth and measured above ground via a measuring point using conventional equipment (total station, GNSS). This allows you to manually monitor depth displacement at regular intervals.
Automated extensometers
In this system, the sensor sits at depth in the borehole, where it records displacement directly. A data logger at ground level collects the data and automatically transmits it to our online platform. Ideal for continuous or hard-to-reach terrain.
Applications:
- Monitoring of deep embankments or preloads
- Control of foundation behavior in heavy structures.
- Detection of differential settlement in multilayered soil structure
Extensometer measurements are often combined with other techniques such as monitoring wells, inclinometers or pocket beacons to provide a complete picture of the subsurface response to construction or infrastructure work.
