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ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 12 - 2024 |
doi: 10.3389/feart.2024.1478252
This article is part of the Research Topic Monitoring, Early Warning and Mitigation of Natural and Engineered Slopes – Volume IV View all 17 articles
Failure mechanism and dynamic process of landslide triggered debris flows-An example from Chongqing, China
Provisionally accepted- 1 Wuhan Center, China Geological Survey (Geosciences Innovation Center of Central South China), Wuhan, China
- 2 Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China, Wuhan, Hubei, China
- 3 College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China, Yichang, Hebei Province, China
- 4 Chongqing Bureau of Geology and Mineral Resources Exploration and Development Nanjiang Hydrogerlogy Engineering Geology Team,Chongqing 401121,China, Chongqing, China
Shallow landslides and debris flows triggered by heavy rainfall are widespread catastrophic geological disasters in mountainous areas. Landslides with complex terrain are often the material source of debris flows as a disaster chain. However, the failure mechanism and dynamic process of landslide triggered debris flow are still not clear. In July 2023, an obvious rockslide occurred during heavy rainfall in Changtan Town, Chongqing City, Southwest China, resulting in one death and seven houses collapsed. In this paper, back analysis in the dynamic process of the Yanghuachi (YHC) landslide triggered debris flow is carried out by the coupled particle flow model and elastic viscoplastic model. The reults indicate that the sliding body moves downward along the sliding surface, pushing the loose deposits at the lower part of the landslide to slip and then extending along the gully to the right bank of the Modao River. The overall movement duration of the landslide in the study area is approximately 180 seconds, with a maximum sliding velocity of about 22.08 m/s and a final deposition thickness of approximately 10.91 m.This study provides a methodology for analyzing the dynamic process of landslide triggered debris flows.
Keywords: landslide triggered debris flow, Particle flow, elasto-viscoplastic, Failure mechanism, Dynamic process
Received: 09 Aug 2024; Accepted: 05 Sep 2024.
Copyright: © 2024 Wang, Dai, Zhang, Cheng and Xiong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Zhenwei Dai, Wuhan Center, China Geological Survey (Geosciences Innovation Center of Central South China), Wuhan, China
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