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<p>Saprolites are highly weathered (W4) to completely decomposed (W5) rocks, with uniaxial compressive strength typically between 0.25&#xa0;MPa and 5&#xa0;MPa (≤ R1+). They retain the fabric of their parent rock and exhibit transitional mechanical behaviour between soils and rocks. For materials with a strength range between 1&#xa0;MPa and 3&#xa0;MPa (≤ R1-), as evaluated in this study, soil mechanics approaches are applied covering steps from undisturbed block sampling to triaxial test interpretation. A comprehensive approach is undertaken to determine the geotechnical behaviour of phyllite saprolites (Quadrilátero Ferrífero Mineral Province, Brazil), encompassing: (I) field characterisation and microscopic petrography; (II) specimen trimming with distinct angles between foliation and <i>σ</i>1; (III) index property determination; (IV) consolidated undrained (CIU) and consolidated drained (CID) triaxial tests; (V) failure mechanisms analysis; and (VI) integrated data evaluation. Triaxial tests were categorised based on index properties, failure mechanism, deformational behaviour, dilatancy, and strength parameters. Saprolites with void ratio &lt; 1 exhibited rock-like behaviour, with shear failure planes controlled by foliation or oblique to it, negative pore pressure, weathering grade mostly W4 and elastic-brittle deformation. Saprolites with void ratio &gt; 1.2 displayed soil-like behaviour, including buckling failure, positive pore pressure, weathering grade W5, and variable deformational behaviour (elastic-plastic, strain-hardening/softening). The study provides correlations with prior work and analyses phyllite saprolites within the soil-rock transition framework, offering a foundation for further projects and geotechnical research.</p>

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Geotechnical behaviour of phyllite saprolites in Quadrilátero Ferrífero Mineral Province, Brazil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月11日

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  • Silas Santos Salgado,
  • Eduardo Antonio Gomes Marques,
  • Mônica Alvarez Pires

摘要

Saprolites are highly weathered (W4) to completely decomposed (W5) rocks, with uniaxial compressive strength typically between 0.25 MPa and 5 MPa (≤ R1+). They retain the fabric of their parent rock and exhibit transitional mechanical behaviour between soils and rocks. For materials with a strength range between 1 MPa and 3 MPa (≤ R1-), as evaluated in this study, soil mechanics approaches are applied covering steps from undisturbed block sampling to triaxial test interpretation. A comprehensive approach is undertaken to determine the geotechnical behaviour of phyllite saprolites (Quadrilátero Ferrífero Mineral Province, Brazil), encompassing: (I) field characterisation and microscopic petrography; (II) specimen trimming with distinct angles between foliation and σ1; (III) index property determination; (IV) consolidated undrained (CIU) and consolidated drained (CID) triaxial tests; (V) failure mechanisms analysis; and (VI) integrated data evaluation. Triaxial tests were categorised based on index properties, failure mechanism, deformational behaviour, dilatancy, and strength parameters. Saprolites with void ratio < 1 exhibited rock-like behaviour, with shear failure planes controlled by foliation or oblique to it, negative pore pressure, weathering grade mostly W4 and elastic-brittle deformation. Saprolites with void ratio > 1.2 displayed soil-like behaviour, including buckling failure, positive pore pressure, weathering grade W5, and variable deformational behaviour (elastic-plastic, strain-hardening/softening). The study provides correlations with prior work and analyses phyllite saprolites within the soil-rock transition framework, offering a foundation for further projects and geotechnical research.