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[1]WEN Yongfu,Gao Peng,MU Xingmin,et al.Analysis on the Stability of Slope in Northern Shaanxi Under Extreme Rainfall[J].Research of Soil and Water Conservation,2018,25(04):365-369.

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Analysis on the Stability of Slope in Northern Shaanxi Under Extreme Rainfall

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 365-369 Column: Public date: 2018-06-13

Title:: Analysis on the Stability of Slope in Northern Shaanxi Under Extreme Rainfall

Author(s):: WEN Yongfu^1,2, Gao Peng^2,3, MU Xingmin^2,3, ZHAO Guangju^2,3, SUN Wenyi^2,3; 1. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China

Keywords:: extreme rainfall; terraced slope; water content; safety factor

CLC:: S157.3

DOI:: -

Abstract:: To better understand the collapse instability mechanism of terraced slope induced by extreme rainfall conditions and study some important features of soil internal parameters with the effect of rainfall simultaneously, model tests and numerical simulation were carried out to research and discuss the terraced slope under simulated rainfall. The results show that during the first 2 hours of the rainfall, the average infiltration rate was 65%, thereafter, as the runoff increased, infiltration rate decreased over time; 8 hours later, infiltration rate fell to a relatively stable value (25%); under the influence of rainfall infiltration, the sliding deformation zone of the terraced slope was between 0~1.0 m below the slope; the maximum amount of deformation in the slope gradually decreased from the slope surface to the depth of the slope, and the collapse type was caused by the erosion of the local shallow destruction; rainfall infiltration caused the pore water pressure and water content to increase and the suction to decrease, so that the shear strength of slope soil reduced due to the reduction of effective stress and soil water softening. The double effect of rainfall infiltration may be one of the main causes related to erosion and collapse of terraced slope induced by rainfall; the safety factor of the terrace slope is decreasing with the duration of rainfall and terraced slope collapsed after 5-hours rainfall.

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