ABSTRACT
In order to assess the pore pressure conditions, to verify the drained behavior or not of a reservoir of a tailings dam raised upstream, and to observe the evolution of the resistence of the material, CPTU surveys were carried out before and after the execution of works for the implementation of vertical geodrains in the reservoir of this dam. After the comparative tests, it was possible to indicate the safety gains of the structures resulting from the execution of the works.
