Strains and displacements at the base of a road embankment

The road embankment was constructed above a substrate reinforced with concrete columns. The transmission layer between the columns and earth body of the structure was equipped with Nerve-Sensors: EpsilonRebars (ER) and 3DSensors for measuring strains and vertical displacements respectively. A total number of 16 sensors were installed both in longitudinal and transverse directions. Furthermore, the sensors were used for simultaneous measurements of temperatures.

DFOS Sensors Installed: EpsilonRebar and 3DSensor

Project challenges

How to apply non-invasive diagnostics in demanding historic structures?
How to get precise measurement data to detect local damage and imperfection?
How to measure detailed strain profiles over the entire height of the brick masonry wall?

Benefits of using the DFOS monitoring system

Measurements of strains, displacements and temperatures at the same time
Full deformation control above the concrete columns during construction
Thermal self-compensation for displacements, no need to measure temperature
Results viewed as displacement values (mm) thanks to a data conversion algorithm

Results of using the DFOS monitoring system

The measurement sessions took place during the construction process. The figure below shows example displacement profiles obtained from transverse 3DSensors. The local effects caused by the presence of concrete columns are clearly detectable. This comprehensive data could not be gained from conventional sensing techniques. It can be used for calibration numerical models and reducing uncertainties, which are especially important during geotechnical design.

Technical specifications

37 800 measurement points
378 m of sensing path
4 x 3DSensor, 12 x ER
during construction

Example results

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John Doe

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3DSensor Datasheet

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