Seismic performance evaluation of a high CFRD using three-dimensional hybrid numerical modelling

The author presents a seismic vulnerability assessment of a 151 m-high concrete-faced rockfill dam (CFRD), with a total volume of 4.2 × 106 m3, located in northwestern Colombia. The primary objective of the study was to evaluate the dam’s dynamic response and overall performance under extreme seismic loading conditions using advanced numerical modelling techniques. To capture the complex interaction between the rockfill, foundation, and concrete face, a three-dimensional hybrid numerical model was developed, integrating complementary approaches to represent both the nonlinear behaviour of geomaterials and the structural response of the concrete slab system. Particular attention was given to the simulation of deformation mechanisms within the rockfill and the resulting stress and strain demands on the concrete face. The analyses indicate that the dam exhibits adequate performance under the considered seismic scenarios, with controlled crest displacements and no evidence of critical distress in the concrete face. The results provide valuable insight into the distribution of deformations and stress concentrations, supporting the overall assessment of the dam’s seismic resilience.