This work presents a back-analysis of a tunnel section based on measured convergences values. The tunnel, located in La Palma Island, was excavated in basaltic pyroclastics. The analysis used FLAC2D and shows the excavation and supporting of the tunnel along with other phases during construction. With this analysis we aimed to obtain realistic values of the geotechnical parameters of pyroclastics. However, its accuracy depends on a great number of variables. Finally, modulus of deformation and parameters CM and ΦM of pyroclastic were estimated. These estimated values are not the only possible solution given the available data, but they represent realistic values in the authors'opinion.

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