You are here: References
|Project||Detection of cavities and structural weak zones in the underground|
|Location||2015 - Retz, Austria|
After a massive water main break, the surrounding buildings showed huge cracks in their façades. Sections of plaster fell down and the buildings settled partly.
Several wine cellars and tunnels are situated below the houses. Mud was also entering into some portions of the cellars. Suspected cavities were injected with concrete or concrete suspension, but more cavities were suspected below the buildings.
TEXPLOR carried out geophysical measurements with ground penetration radar and micro-gravimetry.
Micro-gravimetric measurements detect and outline areas with reduced density distribution, such as underground wash-outs. Ground penetration radar measurements can locate geological and lithological changes, built-in components such as cables, water or sewage pipes, and also the concrete masses injected into the underground.
The investigation showed that the sanitation works had been largely successful. Nonetheless, we found an additional four anomalous zones with reduced density distribution.
Here, the local density was reduced to 250 to 850 kg/m³, which demonstrated the existence of washed-out areas and cavities. The measurement results were displayed in cross profiles and in a ground plan indicating the depth and extension of the anomalous zones.