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    Proposal for a predictive model for micropiles bond resistance based on load tests
    (Universidad EAFIT, 2026-02-20) Molano Quiroz, Mauricio Alejandro; Ruiz Restrepo, Daniel Felipe; NA
    The use of micropiles has gained increasing popularity in Latin America as a foundation system due to their versatility, ease of installation in complex conditions, and growing load-bearing capacity, driven by the availability of specialized equipment, materials, advanced technologies, technical expertise, and a maturing culture of load testing. This allows the designers to reduce uncertainty, particularly from the geotechnical perspective, specifically when comparing them with other foundation systems commonly used in the region. Additionally, the increased implementation of both verification and quality control static load test programs commonly known as verification test and proof test based on the definition presented in the FHWA document for Design and Construction of Micropiles [1], has made it possible to collect sufficient data for estimating design parameters, developing predictive models, and implementing Reliability-Based design (RBD) approaches across different soil conditions. This approach enables optimized solutions that are better adapted to specific loading, geotechnical and geological conditions. This considers the possibility of proposing site resistance factors for geotechnical design of micropiles as mentioned in [2]. To develop the model proposal presented in this study, various tasks were carried out to characterize the geotechnical conditions of the site and to assess the load-deformation behavior of micropiles subjected to tension, compression, and lateral loads. This information served as the foundation for building a strategic framework that allows a comprehensive methodology for the development of a predictive model adaptable to different site conditions considering the information available and allowed comparisons between different construction techniques and their associated skin friction resistance represented in literature as αbond or \tau (tau). A total of 40 load tests were collected and analyzed, located in the fine alluvial deposit zone of the La Pereira stream in the municipality of La Ceja, Antioquia. These tests were performed using two different installation techniques on two different sites in the same geotechnical and geological environment which permit stablish comparison between the two sites. The techniques used were self-drilling micropiles (simultaneous drilling and grouting), and pre-drilled micropiles with Type B or Type C injection, based on the classification presented in [1]. This dual approach enabled comparative analysis of behavior and ground to grout adhesion for different cases regarding injection type and load application (compression and tension). With the purpose of validating and as a benchmark values, additional load test reaching failure were included from other sites.