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This paper presents continuous monitoring results of an instrumented embankment behaviour built on compressible soil. In order to better understand of the embankment behaviour and its foundation, geotechnical investigations, measurements of the monitoring data, interstitial overpressure evolution as well as numerical modelling with soft soil model are analysed. The findings highlight various factors resulting in the failure of the infrastructure. The loading program has proven to be incompatible, which subsequently resulted in an excess of pore pressures. The numerical modelling results have illustrated clearly the behaviour of the embankment particularly, the horizontal displacements and the interstitial overpressure.