The seismic activity in the area of the works in the north of Morocco is very active due to the approach of the African-Eurasian lithospheric plates, and the foundations of the works are located in liquefiable soil. It is certain that soil liquefaction is a phenomenon that presents a potential risk and a major challenge for the construction of the works. These foundations are subject to shear, bending and frictional forces, which can lead to collapse, with serious consequences for bridge construction. The combination of pile foundations with soil treatment against liquefaction by weighted columns seems to be a unique solution for the bridge over the Martil River. The objective is to evaluate the effect of implementing wet weighted columns in liquefiable soil on the piers of a bridge under construction. We applied the finite element method using the PLAXIS software to determine the safety distance to be respected between the ballasted column and the piers in order to avoid any damage to the deep foundations of the bridge structures. The verification of this spacing was validated by the sonic testing method, which verified the continuity of the piles, detecting the presence of cracks or anomalies along the shaft and at the end. The homogeneity and quality of the concrete are assessed, and defects are precisely located, including at the end of the pile. And the solution was to keep a distance of 2 m to minimize the impact of the vibrations of the ballasted column machine on the concrete piles.

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