Abstract #
This paper presents the design and construction aspects of the largest pile curtain retaining structure in the central region of Brazil, specifically in Brasília. The structure was built in a challenging geotechnical environment characterized by unsaturated, collapsible tropical clay soils. The project utilized the Geofine software for design and incorporated innovative approaches to account for the local soil conditions and climate. Initial results from ongoing research on the structure’s performance, particularly in terms of horizontal displacements, are also discussed.
Technical Relevance #
This document is of high importance to geotechnical engineers working in tropical regions with unsaturated soils. It provides valuable insights into the design and construction challenges associated with large retaining structures in such environments. The use of the Geofine software and the adoption of specific design strategies to handle the unique soil conditions in Brasília offer practical guidance for similar projects worldwide.
Target Audience #
The document is aimed at geotechnical engineers, construction professionals, and researchers involved in the design and implementation of deep excavations and retaining structures, particularly in regions with challenging soil conditions. It is also relevant for academics studying the behavior of unsaturated soils and their impact on construction projects.
Software and Methodology #
The design of the retaining structure was performed using the Geofine software, specifically the “sheeting design” module. This software was chosen due to its ability to model complex geotechnical interactions and accommodate the unique soil properties of the Brasília region. The methodology involved a classical modified “free earth support” approach, tailored to the dry season conditions prevalent during construction. The design also considered unsaturated soil parameters, which significantly influenced the overall stability and performance of the structure.
Process Description #
The paper begins by describing the geotechnical characteristics of the site in Brasília, including the presence of porous clay and saprolitic soils. The design process is detailed, highlighting the use of bored piles and passive nails to create the retaining structure. The construction was planned to coincide with the dry season to maximize stability and minimize risks. The paper also includes initial results from instrumentation used to monitor horizontal displacements, which have shown promisingly low levels, indicating successful design implementation.
Main Findings #
The study demonstrates that the use of unsaturated soil parameters and a modified classical design approach can lead to cost-effective and safe retaining structures in tropical climates. The results indicate that the structure has performed well, with minimal horizontal displacements observed during the initial monitoring phase. These findings suggest that similar design strategies could be effectively applied in other regions with comparable soil and climatic conditions.
Practical Applications #
The insights gained from this project are directly applicable to the design and construction of retaining structures in tropical and subtropical regions. The strategies discussed, including the timing of construction relative to seasonal weather patterns and the use of tailored design approaches, can help engineers achieve safe and economical solutions in challenging geotechnical environments.
Limitations and Considerations #
The document notes that the structure was designed to withstand conditions during the dry season, with the understanding that additional measures might be needed if construction extended into the wet season. The success of this approach depends on precise timing and thorough monitoring, as well as the ability to implement contingency plans if unexpected soil behavior occurs.
Conclusions #
The paper concludes that the combination of innovative design, careful timing, and appropriate software tools like Geofine can result in effective and economical retaining structures, even in regions with complex geotechnical conditions. The project serves as a model for future constructions in similar environments, emphasizing the importance of understanding local soil behavior and integrating it into the design process.
Related Resources #
Further reading includes studies on the behavior of unsaturated soils under different climatic conditions, as well as case studies of retaining structures in other tropical regions. Exploring additional resources on the application of Geofine and similar software in complex geotechnical projects can provide deeper insights into optimizing design strategies.
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