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<p>Understanding the behavior of foundations resting on collapsible soils is essential to prevent building issues such as cracks, fissures, and performance deficiencies. Accordingly, the objective of this study was to evaluate the behavior of short bored piles installed in tropical, collapsible soils in the region of Uberlândia, Minas Gerais, Brazil. To assess the performance of these foundations, two identical bored piles, 6&#xa0;m in length and 0.25&#xa0;m in diameter, were instrumented. Under both in-situ and flooded moisture conditions, the piles were subjected to static and slow load tests (SLT) under both compression and tension. Finite element numerical models were validated through two-dimensional and three-dimensional analyses using experimental parameters. To establish consolidated average parameters, other bored piles of varying lengths, tested by different authors in the same experimental field, were compared. The results indicated that the unit lateral skin friction under tension exceeded that under compression by more than twice. Soil flooding reduced the pile’s compression load capacity by approximately 50% compared to in-situ moisture conditions. Load transfer analysis showed an increasing contribution of the pile tip in compression as loading stages advanced, and full mobilization of the pile under tension. Furthermore, a correction was proposed for a parameter in a widely used Brazilian method for estimating the load capacity of piles.</p>

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Analysis of Short Bored Piles in Tropical Soil Under Tension and Compression Load Tests

  • 期刊论文

  • 发表日期：

    2025年1月18日

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  • Rogério Saraiva Júnior,
  • Jean Rodrigo Garcia

摘要

Understanding the behavior of foundations resting on collapsible soils is essential to prevent building issues such as cracks, fissures, and performance deficiencies. Accordingly, the objective of this study was to evaluate the behavior of short bored piles installed in tropical, collapsible soils in the region of Uberlândia, Minas Gerais, Brazil. To assess the performance of these foundations, two identical bored piles, 6 m in length and 0.25 m in diameter, were instrumented. Under both in-situ and flooded moisture conditions, the piles were subjected to static and slow load tests (SLT) under both compression and tension. Finite element numerical models were validated through two-dimensional and three-dimensional analyses using experimental parameters. To establish consolidated average parameters, other bored piles of varying lengths, tested by different authors in the same experimental field, were compared. The results indicated that the unit lateral skin friction under tension exceeded that under compression by more than twice. Soil flooding reduced the pile’s compression load capacity by approximately 50% compared to in-situ moisture conditions. Load transfer analysis showed an increasing contribution of the pile tip in compression as loading stages advanced, and full mobilization of the pile under tension. Furthermore, a correction was proposed for a parameter in a widely used Brazilian method for estimating the load capacity of piles.