Field Loading Tests to Optimize the Foundation Design of the Bogota Metro
Publication: IFCEE 2021
ABSTRACT
The basic design studies for the First Line of the Bogotà Metro propose the execution of approximately 270,000 mL of drilled shafts. The cost of performing these drilled shafts represents 15% of the total cost of the project. The results of load tests on piles reported in the city, although limited in terms of quantity, have shown that the actual load capacity of the piles can exceed the expected values in the designs. With the objective of optimizing the dimensions of the foundations, nine field loading tests on real scale piles were executed. The proposed tests contemplated the installation of hydraulic elements inside each pile (Osterberg cells) to induce actions capable of failing the pile and that allowed to register the mobilization of resistance along the shaft and the tip by means of the instrumentation of the induced deformations on the pile. This paper presents the results and interpretation from the static, axial, and bi-directional load tests carried out using hydraulic jacks (e.g., Osterberg “O-cell” cells) on deep foundations distributed along the corridor and the relevant construction aspects of the tests.
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IFCEE 2021
Pages: 421 - 432
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© 2021 American Society of Civil Engineers.
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Published online: May 6, 2021
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