Analysis of Deformations of Gravel Columns in Tailings Dams Using the Finite Element Method and Constitutive Equations

Abstract

In this research, the analysis of the deformations of the gravel columns applied in the foundation of the dam's regrowth of the centerline method is developed. The purpose is to guarantee its stability against the potential liquefaction phenomenon induced by a seismic event, construction and external loads. The configuration of the centerline method dam has a part of the foundation in sedimented tailings material upstream and downstream it has a stable foundation. For the analysis of the gravel columns and the structure, the mechanical and geotechnical properties of the original materials (tailings) and gravel that is part of the column, as well as the fill materials that make up the structure of the dam, have been considered. In view of the problems identified, we propose that the application of gravel columns is an optimal alternative that improves the short and long term consolidation time of the sediment tailings upstream of the dam.The results obtained from the modeling analysis in the Plaxis 2D program determine that it improves the shear strength and reduces settlements or deformations. It allows the release of pore pressure stresses through the gravel columns that function as a vertical subdrainage system.As for the initial modeling without gravel columns.