Measurements of soil vertical displacements arounda concrete footing

This project aimed to determine the potential slip plane that occurred during the concrete footing pullout. For this purpose, 3DSensors (DFOS displacement sensors) were installed around the structure in two planes, and vertical displacements were measured. Thanks to the cutting-edge technology of 3DSensors, an advanced analysis of the interaction between the footing and the surrounding ground were possible without any distortions and reinforcing effect in the ground.

DFOS Sensors Installed: 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

Fast and easy installation of lightweight sensors, standard compacting feasible
Flexible sensors do not cause distortions or reinforcing effects in the ground
Results seen as displacement values thanks to a data conversion algorithm
Nervous system in the ground with results unreachable for conventional sensors

Results of using the DFOS monitoring system

Two layers of 3DSensors were installed, parallel to the edges of the footing at 80 cm and 160 cm above the footing base. The structure was pulled out of the ground through a specially designed stand while strain measurements were taken step-wise with 3DSensors. A designed algorithm for data conversion allowed to direct determination of vertical displacements in both layers around the footing. The figure presents the spatial visualization of example results expressed directly in mm for a chosen load step.

Technical specifications

10 000 measurement points
72 m of sensing path
12 3DSensors
short term load tests

Example results

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John Doe

Project partner

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