> The Rincent Nord-Pas-de-Calais agency intervened on a parking project in Colmar. It was to perform a tensile test on piles whose function is to take up the pushing forces induced by the water during the rise of the water table.
The test load was monitored by a calibrated load cell. To be noted in the foreground of the photograph, the presence of a pumping well that allows lowering the water table. The efforts generated by the horizontal water pressure are quickly very important. For example, a parking lot of 5,000m² under a hydraulic load of one-meter-high water leads to a horizontal pressure of 5,000 tons.
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