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Article

Experimental Study on Landslides in Terraced Fields in the Chinese Loessial Region under Extreme Rainfall

1
Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou 061001, China
2
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Xianyang 712100, China
3
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Xianyang 712100, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(3), 270; https://doi.org/10.3390/w13030270
Received: 17 December 2020 / Revised: 16 January 2021 / Accepted: 19 January 2021 / Published: 22 January 2021
(This article belongs to the Special Issue Soil–Water Conservation, Erosion, and Landslide)
Due to the development of the scale of tractor-ploughed terraces, terraces have been increasing in number, while global climate change is causing frequent extreme rainfall events in the Loess Plateau, resulting in many terrace landslides. To study the mechanism and process of shallow landslides and deep slip surface of terraces induced by extreme rainfall in loess hill and gully area, we conducted a laboratory model test of a terrace under artificial rainfall and used the Swedish arc strip method. The research results are as follows. The mechanism of shallow landslides in terraces is rill erosion accelerating rainfall infiltration, suspending the slope, and increasing its bulk density. The destruction process of shallow landslides can be roughly divided into six processes, and the earth volume of the landslide is 0.24 m3. The mechanism of the deep sliding surface in terraces occurs under the combined action of water erosion and gravity erosion. The soil moisture content increases, which decreases the anti-sliding moment and increases the sliding moment, and the safety factor becomes less than the allowable limit for terraces. The deep sliding deformation area of the terrace was 0~1.0 m below the slope surface, slip surface radius was 1.43 m, the slip surface angle was 92°, and the deep sliding surface began to form earlier than terraced shallow landslides. The displacement of the characteristic points increased from the slope top, to the slope center, and to the slope foot, with maximum displacements of 40.3, 15.5, and 6.0 mm, respectively. View Full-Text
Keywords: laboratory model test; extreme rainfall; rill erosion; shallow landslides; deep lip surface; safety factor laboratory model test; extreme rainfall; rill erosion; shallow landslides; deep lip surface; safety factor
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MDPI and ACS Style

Wen, Y.; Gao, P.; Mu, X.; Li, M.; Su, Y.; Wang, H. Experimental Study on Landslides in Terraced Fields in the Chinese Loessial Region under Extreme Rainfall. Water 2021, 13, 270. https://doi.org/10.3390/w13030270

AMA Style

Wen Y, Gao P, Mu X, Li M, Su Y, Wang H. Experimental Study on Landslides in Terraced Fields in the Chinese Loessial Region under Extreme Rainfall. Water. 2021; 13(3):270. https://doi.org/10.3390/w13030270

Chicago/Turabian Style

Wen, Yongfu, Peng Gao, Xingmin Mu, Mengzhen Li, Yongjun Su, and Haixing Wang. 2021. "Experimental Study on Landslides in Terraced Fields in the Chinese Loessial Region under Extreme Rainfall" Water 13, no. 3: 270. https://doi.org/10.3390/w13030270

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