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<p>Lateritic soils generally exhibit an apparently strong structure that can disintegrate upon contact with water, which characterizes their collapsibility. The effects of flooding and treatment of these soils in practical contexts and real-scale applications, such as in piles, are still scarcely explored in the literature. In this study, Finite Element Analysis (FEA) is used to investigate the effects of compacted soil–cement treatment and flooding on the mechanical behavior of four non-instrumented flexible Continuous Flight Auger (CFA) piles (L/D = 30) built in the collapsible lateritic soil of Campinas, Brazil, as well as to explore new dimensions for the treated soil volume. A total of ten lateral load tests were performed covering the following conditions: (1) untreated and non-flooded, (2) untreated and flooded, (3) treated and non-flooded, and (4) treated and flooded. A calibration procedure was proposed for determining strength parameters through back-analysis, validated by comparison with laboratory results from the literature. The soil-pile interaction analysis demonstrated that soil improvement directly influences mechanical behavior, developing higher soil resistance rates in shallower layers, which decrease up to a certain depth before increasing again. The flooding influenced only the magnitudes of the p-y curves, whereas their overall distribution patterns remained consistent with those observed in the non-flooded cases. The new dimensions analysis indicated that expanding the mass of soil–cement employed does not necessarily ensure enhanced pile performance. Furthermore, extending the length and width of this treated volume proved to be more effective than increasing its height, since substantial improvements were restricted to a depth of 2&#xa0;m.</p>

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Numerical Study of Soil–Cement Treatment Effects on Laterally Loaded CFA Piles in Collapsible Soils

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Yuri Barbosa,
  • André Luís Gamino,
  • Paulo José Rocha Albuquerque,
  • Gentil Miranda Jr.,
  • David Carvalho,
  • Marcos Massao Futai

摘要

Lateritic soils generally exhibit an apparently strong structure that can disintegrate upon contact with water, which characterizes their collapsibility. The effects of flooding and treatment of these soils in practical contexts and real-scale applications, such as in piles, are still scarcely explored in the literature. In this study, Finite Element Analysis (FEA) is used to investigate the effects of compacted soil–cement treatment and flooding on the mechanical behavior of four non-instrumented flexible Continuous Flight Auger (CFA) piles (L/D = 30) built in the collapsible lateritic soil of Campinas, Brazil, as well as to explore new dimensions for the treated soil volume. A total of ten lateral load tests were performed covering the following conditions: (1) untreated and non-flooded, (2) untreated and flooded, (3) treated and non-flooded, and (4) treated and flooded. A calibration procedure was proposed for determining strength parameters through back-analysis, validated by comparison with laboratory results from the literature. The soil-pile interaction analysis demonstrated that soil improvement directly influences mechanical behavior, developing higher soil resistance rates in shallower layers, which decrease up to a certain depth before increasing again. The flooding influenced only the magnitudes of the p-y curves, whereas their overall distribution patterns remained consistent with those observed in the non-flooded cases. The new dimensions analysis indicated that expanding the mass of soil–cement employed does not necessarily ensure enhanced pile performance. Furthermore, extending the length and width of this treated volume proved to be more effective than increasing its height, since substantial improvements were restricted to a depth of 2 m.