Análisis tridimensional de la ejecución de dos excavaciones profundas en la ciudad de Bogotá d.c., empleando elementos finitos

Abstract

The objective of this work is to carry out the three-dimensional modeling of two excavations that were made in soft soils in Bogotá. With these models, an analysis of the geotechnical behavior of these excavations was attempted. Additionally, the obtained results were compared and verified with two-dimensional models of the same excavations. This work aims to validate the three-dimensional models and promote the use of this type of numerical modeling in geotechnical design. The analyzed buildings consist of several levels above the ground and up to three basements each. However, they differ in their geometries, sizes, use of the building, and variation in location, which allows analyzing different stratigraphic profiles that delineate the type of soil found in two specific areas of the city of Bogotá. The displacement results observed during the construction stages were obtained through geotechnical instrumentation and were compared with the results obtained from the three-dimensional modeling. The three-dimensional models were based on geotechnical information obtained through instrumentation and field measurements. Some parameters were modified within the three-dimensional modeling to adjust the behavior and make it similar to the results obtained through instrumentation. Finally, the results of the three-dimensional modeling were compared with the two-dimensional models, showing some differences in terms of displacements. The two-dimensional modeling differed from the field measurements, while the three-dimensional modeling showed a better fit and allowed analyzing the structure in its entirety, including the entire geometry of both buildings. This validates the application of these models in geotechnical designs and provides guidelines for their use in future construction projects.