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Free iron oxides loss accelerates Benggang erosion
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DOI：10.1007/s11368-026-04457-9.png)
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Abstract
En 中文
Granite-derived lateritic weathered profiles are susceptible to the combined effects of hydraulic and gravitational forces, which destabilize and collapse to form contiguous, permanent erosion gullies. This study aimed to elucidate how variations in moisture content and free iron oxides (FIO) affect the mechanical properties of granitic red soils. Soil samples from four profile layers were subjected to five levels of FIO removal (0, 20%, 40%, 60%, 80%) and a range of moisture contents (0.05, 0.10, 0.15, 0.20, 0.25 g/g), and their mechanical responses were systematically evaluated, including shear strength, Atterberg limits, and shrinkage characteristics. Moisture content and FIO removal interactively affected shear strength of granitic red soil. The highest stability occurred at moderate moisture content (from 0.129 to 0.173 g/g) without FIO leaching. FIO removal decreased Atterberg limits and increased radial shrinkage. Among soil layers, the laterite layer was most sensitive to the combined effects of moisture and FIO changes. The coupling mechanism of moisture and FIO impacts soil mechanical behavior and trigger profile instability and collapse. In granite-derived red soil regions, greater emphasis should be placed on preventing the loss of FIO and strengthening the protection of the laterite layer.
Keywords:
Granite-derived red soil
Moisture content
Free iron oxides
Shear strength
Atterberg limits
Shrinkage behaviour
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