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Fiber optic distributed sensing is widely used for structural health monitoring as well as in smart and intelligent structures.What level of accuracy is achievable?
Distributed fiber optic sensing takes the guesswork out of monitoring the temperature of concrete as it cures in large structures, critical to ensuring an energy and cost efficient build.
By measuring temperature (exothermic reaction) inside the structure as it cures, you have the data indicating when curing is complete and you can proceed to the next step, often significantly reducing the time suggested by Standards.
Distributed strain monitoring can detect the formation of thermal cracks in an early phase of the construction.
The fiber optic instrumented pile load test reliably evaluates the geotechnical performance of piles. Foundation design can be optimized, resulting in:
while respecting structural performance and reliability requirements.
You can monitor pile strain continuously during and after installation. Both strain and compression are measured in real time and remotely. Pile-soil structure interaction can be evaluated.
Fiber optic strain sensing is included in the ‘Specification, requirements and guidance notes’ of ‘ICE Specification for Piling and Embedded Retaining Walls,’ (Institution of Civil Engineers). Guidance for both embedded and surface-attached fiber optic strain sensors is included.
ICE Specification for Piling and Embedded Retaining Walls
PROJECT: Static Pile Loading Tests
Distributed fiber optic sensing uniquely helps you understand what is happening inside during the construction and settlement of large earth structures, such as slopes, retaining walls, dikes, levees and embankments
Instrumenting underground infrastructure provides information about the effect of construction, such as ground movement (strain changes).
Fiber optic sensing uses robust inert sensing cables to monitor continuously, in real-time.
The technique is immune to electromagnetic interference (EMI), important when monitoring the condition of train tunnels, underground rail systems and mines.
With a range of 50 km, the fiber optic sensing can be embedded in the structure and attached to rock nails, providing always-on structural health monitoring.
Once installed, embedded fiber optic sensors may be interrogated during the operational lifetime of the asset to detect long-term erosion and other ground or tectonic movements in the tunnel surroundings.
ITA President Keynote speech, British Tunnelling Society 2022:
‘Down to the next Level – a role for The UN Global Compact for the underground sector?’
Watch Arnold Dix’s speech:
Heavier rains and violent storms result in erosion.
In transport infrastructure, cuttings and embankments are at risk of unseen developing landslides. Dikes, levées and steep slopes surrounding water basins, lakes – from erosion. Ports, coastal and sea defenses – from sea level rise and permafrost thawing. Tailings dams deform due to liquefaction and foundation failure.
And when the ground dries out, it cracks, a precursor to landslides.
fibrisTerre systems detect and locate small strain and temperature events over large areas- a single interrogator can monitor 50 km of fiber optic sensing.
When ground movement, settlement or creep and its location are detected with fiber optic sensing, perhaps installed in a geotextile, it can be mitigated and safety management plans revised.
The fiber optic sensing cable can be
For direct burial, a range of ruggedised geotechnical sensing cables is available to suit different applications and terrains.
Soil-anchors may be added to increase strain transfer
Integrating strain sensing cables within smart geotextiles increases strain transfer and extends the area monitored in the soil.