A study on the motion and accumulation process of non-cohesive particles
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A study on the motion and accumulation process of non‑cohesive particles Kunlin Lu1 · Yiming Chen1 · Linfei Wang1 Received: 4 December 2019 / Accepted: 31 August 2020 © Springer Nature B.V. 2020
Abstract In order to further understand the mechanism of landslide-debris flow and predict the entire movement process and accumulation range of landslide hazards, the movement process of non-cohesive particles and the distribution of accumulation at the bottom of the slope were studied. Firstly, physical laboratory-scale tests on the sliding accumulation process of non-cohesive granular accumulations under self-weight were carried out, and the effects of different volumes and gradations on the sliding accumulation were analyzed. Then, the discrete element software PFC3D was used to perform three-dimensional numerical back analysis of the tests to refine the key parameters required for the numerical simulation, and to understand better the movement and accumulation state of the granular body. The results showed that the spherical particles exhibit obvious lateral expansion during the acceleration stage, and the front-end particles had a clear "shuttle" distribution, which became even more obvious with the increase in the content of large particles. The reverse-order phenomenon of spherical particles after sliding was that the proportion of small particles in the proximal end was far higher than their original proportion in the accumulation body. With the increase in the volume of the accumulation body, the phenomenon became more obvious, and stopping of large particles above the small particles was observed. The research results can provide reference for further studies of the movement process and the distribution patterns of the slip instability failures of non-cohesive accumulation bodies. Keywords Landslide · Motion mechanism · Accumulation shape · Model experiment · Numerical simulation
1 Introduction In recent years, China has experienced frequent strong earthquakes and extreme weather events, among which landslide geological disasters have had the highest frequency. The landslide-debris flow has an extremely high velocity and super-long migration distance. For example, in the landslide-debris flow that occurred in Yigong, Tibet, in 2000, the total volume of collapsed landslides exceeded 3.8 × 108 m3, completely blocking the * Kunlin Lu [email protected] 1
School of Civil Engineering, Hefei University of Technology, Hefei, Anhui, China
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Natural Hazards
main stream of the Zangbu River and forming a barrier lake (Ren et al. 2001). In Wenjiagou, Sichuan Province, a large-scale landslide-debris flow occurred in the aftermath of the Wenchuan earthquake and a secondary geological disaster chain formed (Huang and Zhao 2010). In 2010, the area again experienced a large-scale debris-flow disaster (Ma and Wu 2011). In 2017, in Xinmocun, Maoxian, Fugui Mountain slid along the rock layer and disintegrated rapidly along the slope surface under the action of many factors, which characterizes the
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