Investigation of soil shear-strength parameters and prediction of the collapse of gully walls in the black soil region of Northeastern China

Auteur(s) et Affiliation(s)

DONG, Y.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

MOE Engineering Center of Desertification and Blown-Sand Control, Normal Univ., Beijing, Chine

WU, Y.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

MOE Engineering Center of Desertification and Blown-Sand Control, Normal Univ., Beijing, Chine

YIN, J.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

MOE Engineering Center of Desertification and Blown-Sand Control, Normal Univ., Beijing, Chine

WANG, Y.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

MOE Engineering Center of Desertification and Blown-Sand Control, Normal Univ., Beijing, Chine

GOU, S.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

MOE Engineering Center of Desertification and Blown-Sand Control, Normal Univ., Beijing, Chine

Description :
The collapse of gully walls is an important mode of gully erosion, and it depends strongly on 2 soil shear-strength parameters : cohesion and the internal friction angle. In this study, the AA. sampled 6 groups of surface soils from 4 different land uses, and 2 groups of soils at depths of 30 cm and 60 cm. The cohesion and internal friction angle of each group were determined at 10 levels of water content. The AA. developed a model predicting collapse of gully walls based on 4 parameters : dry bulk density, water content, crack depth, and the width of the soil collapse. The model predicts that soil collapse would occur at 2 levels of water content: dry and wet conditions. Field data showed that collapse only occurred under the wet condition; the critical mass water content given by the model is between 31.0% and 33.8% moisture.

Type de document :
Article de périodique

Source :
Physical geography, issn : 0272-3646, 2011, vol. 32, n°. 2, p. 161-178, nombre de pages : 18, Références bibliographiques : 27 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis

Langue :
Anglais