Compressive response of some agricultural soils influenced by the mineralogy and moisture
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Department of Agricultural and Environmental Engineering, Federal University of Technology, PMB 704, Akure Ondo State, Nigeria
Department of Soil Science, Federal University of Lavras, Postal Box 3037, CEP:37200-000, Lavras, Brasil
Department of Agricultural and Bio-Environmental Engineering, Federal Polytechnic PMB 5351 Ado Ekiti, Ekiti State, Nigeria
Int. Agrophys. 2013, 27(3): 239-246
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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