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Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria

Okagbue, C. O. / Ezechi, J. I.

Abstract The geotechnical characteristics of soils that are susceptible to severe gullying in the rain forest zone of Nigeria were studied. The soils are predominantly sands whose fines (silt/clay) contents are very negligible. The sands are loose (dry density 1.42–1.73 g/$ cm^{3} $) and highly permeable (permeability 9.43×$ 10^{3} $−3.4×$ 10^{2} $cm/s) with permeability increasing with depth. Porosities and void ratios are also high (41.6–50.3% and 0.71–1.01 respectively), while cohesion is small to zero (0–85 kN/$ m^{2} $). It is thought that although these conditions favour less runoff and high infiltration, they lead to high internal flow velocities and seepage pressures, and ultimately high internal erosion. It is concluded that once a gully is initiated, the soil properties become responsible for rapid propagation. Non response of the gullies studied to afforestation control measures is thought to result from these soil properties.

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Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria

Okagbue, C. O. / Ezechi, J. I.

Abstract The geotechnical characteristics of soils that are susceptible to severe gullying in the rain forest zone of Nigeria were studied. The soils are predominantly sands whose fines (silt/clay) contents are very negligible. The sands are loose (dry density 1.42–1.73 g/$ cm^{3} $) and highly permeable (permeability 9.43×$ 10^{3} $−3.4×$ 10^{2} $cm/s) with permeability increasing with depth. Porosities and void ratios are also high (41.6–50.3% and 0.71–1.01 respectively), while cohesion is small to zero (0–85 kN/$ m^{2} $). It is thought that although these conditions favour less runoff and high infiltration, they lead to high internal flow velocities and seepage pressures, and ultimately high internal erosion. It is concluded that once a gully is initiated, the soil properties become responsible for rapid propagation. Non response of the gullies studied to afforestation control measures is thought to result from these soil properties.

Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria

Okagbue, C. O. / Ezechi, J. I.

Abstract The geotechnical characteristics of soils that are susceptible to severe gullying in the rain forest zone of Nigeria were studied. The soils are predominantly sands whose fines (silt/clay) contents are very negligible. The sands are loose (dry density 1.42–1.73 g/$ cm^{3} $) and highly permeable (permeability 9.43×$ 10^{3} $−3.4×$ 10^{2} $cm/s) with permeability increasing with depth. Porosities and void ratios are also high (41.6–50.3% and 0.71–1.01 respectively), while cohesion is small to zero (0–85 kN/$ m^{2} $). It is thought that although these conditions favour less runoff and high infiltration, they lead to high internal flow velocities and seepage pressures, and ultimately high internal erosion. It is concluded that once a gully is initiated, the soil properties become responsible for rapid propagation. Non response of the gullies studied to afforestation control measures is thought to result from these soil properties.

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Title:

Geotechnical characteristics of soils susceptible to severe gullying in eastern Nigeria

Contributors:

Okagbue, C. O. (author) / Ezechi, J. I. (author)

Published in:

Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur ; 38

Publication date:

1988

ISSN:

DOI:

https://doi.org/10.1007/BF02590454

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Zeitschrift , Online-Ressource , Ingenieurgeologie

Classification:

BKL: 56.00$jBauwesen: Allgemeines / 38.58 Geomechanik / 38.58$jGeomechanik / 56.20 Ingenieurgeologie, Bodenmechanik / 56.00 Bauwesen: Allgemeines / 56.20$jIngenieurgeologie$jBodenmechanik
RVK: ELIB18

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