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<p>This study aims to evaluate the ultimate bearing capacity of soils supporting shallow foundations by combining the c–φ laboratory method with light dynamic penetrometer (DPL) testing, while assessing the influence of soil mineralogy. The approach is applied to the geotechnical mapping of soils in the Penka-Michel area (Western Cameroon). To this end, DPL soundings were carried out, and relatively intact soil samples were collected for laboratory determination of geomechanical properties and mineralogical composition using X-ray diffraction (XRD). The geotechnical characterization indicates that the soils belong mainly to highly plastic clays and silts (A3) and sands with fines (A2), according to the GTR classification system. The internal friction angle ranges from 15.33° to 31.86°. Ultimate bearing capacities derived from in-situ testing vary between 121.04 and 1578.82&#xa0;kPa, compared with values ranging from 388.04 to 1519.23&#xa0;kPa obtained using the c–φ method. XRD analyses reveal the presence of kaolinite, quartz, gibbsite, goethite, alkali feldspars, plagioclase, anatase, and hematite. The soils exhibit low to high compressibility, with compression indices between 0.019 and 0.113. The results indicate that mineralogical composition is significantly correlated with the mechanical behavior of the soils, with correlation coefficients exceeding 0.7. Based on these findings, the geotechnical mapping distinguishes three soil classes: low bearing capacity soils with high compressibility, soils with moderate mechanical behavior, and soils with high bearing capacity suitable for heavy structures. The proposed geotechnical map provides a useful preliminary decision-support tool for identifying areas favorable for construction.</p>

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Influence of mineralogy on the bearing capacity of soils under shallow foundations: application to the geotechnical mapping of soils in Penka-Michel (Western Cameroon)

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Thiery Blondel Suffeu Talla,
  • Eric Donald Teikeu Ngueveu,
  • Dérryl Médard Foko Tchanamou,
  • Verlène Hardy Njuikom Djoumbi,
  • Gervaise Kieufack,
  • Bertille Ilalie Manefouet Kentsa,
  • Jean Victor Kenfack,
  • Armand Sylvain Ludovic Wouatong

摘要

This study aims to evaluate the ultimate bearing capacity of soils supporting shallow foundations by combining the c–φ laboratory method with light dynamic penetrometer (DPL) testing, while assessing the influence of soil mineralogy. The approach is applied to the geotechnical mapping of soils in the Penka-Michel area (Western Cameroon). To this end, DPL soundings were carried out, and relatively intact soil samples were collected for laboratory determination of geomechanical properties and mineralogical composition using X-ray diffraction (XRD). The geotechnical characterization indicates that the soils belong mainly to highly plastic clays and silts (A3) and sands with fines (A2), according to the GTR classification system. The internal friction angle ranges from 15.33° to 31.86°. Ultimate bearing capacities derived from in-situ testing vary between 121.04 and 1578.82 kPa, compared with values ranging from 388.04 to 1519.23 kPa obtained using the c–φ method. XRD analyses reveal the presence of kaolinite, quartz, gibbsite, goethite, alkali feldspars, plagioclase, anatase, and hematite. The soils exhibit low to high compressibility, with compression indices between 0.019 and 0.113. The results indicate that mineralogical composition is significantly correlated with the mechanical behavior of the soils, with correlation coefficients exceeding 0.7. Based on these findings, the geotechnical mapping distinguishes three soil classes: low bearing capacity soils with high compressibility, soils with moderate mechanical behavior, and soils with high bearing capacity suitable for heavy structures. The proposed geotechnical map provides a useful preliminary decision-support tool for identifying areas favorable for construction.