RT Journal Article ID 5fa5b194168047d3 A1 Callari, Carlo A1 Froiio, Francesco T1 A HYDROMECHANICAL FINITE ELEMENT FORMULATION FOR LOCALIZED INTERNAL EROSION IN POROUS MEDIA, WITH APPLICATION TO BACKWARD PIPING IN COFFERDAMS JF International Journal for Multiscale Computational Engineering JO JMC YR 2020 FD 2020-04-21 VO 18 IS 2 SP 181 OP 197 K1 seepage K1 poro-elastoplasticity K1 localized flows K1 localized erosion K1 internal erosion K1 backward erosion piping K1 cofferdams K1 sheet-pile walls K1 soil heaving K1 finite elements AB We have recently proposed a finite element formulation able to simulate the localization of propagating internal erosion in rigid porous media. In the present paper, such method is extended to deformable porous solids, in order to also model the interaction between backward erosion piping and soil movements. We present the equations governing the exchange and transport of solid and fluid mass in a saturated poro-elastoplastic solid embedding a propagating erosion conduit conveying a multiphase flow. The full set of coupled finite element equations is then obtained from the weak formulations of mechanical equilibrium and fluid mass balance. The performance of the proposed formulation is assessed through an analysis of the soil response to the progressive dewatering of a cofferdam. The hydromechanical coupling and the ability in capturing both the onset and propagation of piping are crucial for an interpretation of the limit states typically observed in these structures. PB Begell House LK https://www.dl.begellhouse.com/journals/61fd1b191cf7e96f,453304c124256f66,5fa5b194168047d3.html