This study aimed to investigate the mineralogy,
moisture retention, and the compressive response of two agricultural
soils from South West Nigeria. Undisturbed soil cores at
the A and B horizons were collected and used in chemical and
hydrophysical characterization and confined compression test.
X-ray diffractograms of oriented fine clay fractions were also
obtained. Our results indicate the prevalence of kaolinite minerals
relating to the weathering process in these tropical soils. Moisture
retention by the core samples was typically low with pre-compression
stress values ranging from50 to 300 kPa at both sites. Analyses
of the shape of the compression curves highlight the influence of
soil moisture in shifts from the bi-linear to S-shaped models. Statistical
homogeneity test of the load bearing capacity parameters
showed that the soil mineralogy influences the response to loading
by these soils. These observations provide a physical basis for the
previous classification series of the soils in the studied area. We
showed that the internal strength attributes of the soil could be
inferred from the mineralogical properties and stress history. This
could assist in decisions on sustainable mechanization in a datapoor
environment.
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