Effect of initial water content on soil failure mechanism of loess mudflow disasters

Frontiers in Ecology and Evolution

Ecology and Evolution

Pan Ding¹  Zhiquan Yang²  Mao Chen³  Yi Yang⁴  Na He⁵  Jie Zhang⁶ 

[1] China Construction Science and Technology Group Co., Ltd., Chongqing, Sichuan, China;Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan, China;Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming, Yunnan, China;Key Laboratory of Early Rapid Identification, Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province, Kunming University of Science and Technology, Kunming, Yunnan, China;Key Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People’s Republic of China, Kunming University of Science and Technology, Kunming, Yunnan, China;Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan, China;Key Laboratory of Early Rapid Identification, Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province, Kunming University of Science and Technology, Kunming, Yunnan, China;Key Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People’s Republic of China, Kunming University of Science and Technology, Kunming, Yunnan, China;Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming, Yunnan, China;Key Laboratory of Early Rapid Identification, Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province, Kunming University of Science and Technology, Kunming, Yunnan, China;Key Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People’s Republic of China, Kunming University of Science and Technology, Kunming, Yunnan, China;School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, China;Yunnan Institute of Geological Environment Monitoring, Kunming, Yunnan, China;

关键词: initial soil water content;    flume experiments;    loess;    loess mudflow;    soil failure mechanism;   

DOI  :  10.3389/fevo.2023.1141155

 received in 2023-01-10, accepted in 2023-04-03,  发布年份 2023

来源: Frontiers

【 摘 要 】

The frequency of mudflow disasters induced by rainfall in the Loess Plateau is increasing with the occurrence of global warming. The initial water content is one of the basic properties of soil, which affects the initiation of loess mudflow. In this work, the field study of the debris flow gullies in Yan’an City, Shaanxi Province, China, was conducted, and the main factors that induce gully loess mudflow were summarized. Based on the investigation results, a flume model was designed to carry out flume tests with different initial soil water contents. The experimental results demonstrate the following. (1) Different initial soil water contents lead to different soil failure models. The damage of soil by water flow when the soil water content is in the range of 0−5% is mainly gully erosion; that within the range of 10−15% is mainly rill surface erosion; that within the range of 20−25% is mainly dam breach failure. (2) When the water content of loess is equal to or less than 5% or equal to or greater than 20%, soil can promote the formation of loess mudflow, and the destruction of soil is more likely to cause mudflow disasters. In contrast, when the water content is within 10−15%, loess mudflow is not easily produced. The research results of the initial water content provide not only theoretical support for the study of loess mudflow disasters, but also a reference for the prevention and control of loess mudflow disasters in the Loess Plateau.

【 授权许可】

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Copyright © 2023 Yang, Chen, Zhang, Ding, He and Yang.