Directional arrangement of phyllite fragments in phyllite talus slope at the eastern margin of the Tibetan Plateau

Wan, Yu-Hao; Zhao, Xiaoyan; Ling, Sixiang; Jin, Li; Zeng, Caiyun; Wünnemann, B.

doi:10.1007/s11629-020-6605-2

Cited by 2 publications

(1 citation statement)

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“…The evaluation of the talus slope is one of the most important slope surface processes on the exposed hard rocks in mountainous regions (Statham, 1976;Evans and Hungr, 1993;De Blasio and Saeter, 2015). Recently, research on rockfall activity in outcrop-talus slope systems has been conducted mainly for the European Alps (Jomelli and Francou, 2000;McCarroll et al, 2001;Otto and Sass, 2005;Sanders, 2010;Sanders et al, 2014;Colucci et al, 2016;Vehling et al, 2017;Messenzehl et al, 2018;Hendrickx et al, 2020), the Japanese Alps (Imaizumi et al, 2020), and some mountains in the UK (Curry and Morris, 2004), North America (Veilleux et al, 2020;Collins et al, 2022), and the Tibetan Plateau (Wan et al, 2021).…”

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confidence: 99%

The formation mechanism and failure mode of a talus slope induced by rockfalls in Nayong County, Southwest China

Yang

Xing

et al. 2022

Front. Earth Sci.

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Hillslope processes and mass movement are key issues in the analysis and evaluation of geological disasters in mountainous regions. A rockfall-dominated talus slope exhibits a typical outcrop–talus slope system as the product of detached boulders and rock fragments. The Zongling rockfall zone is one of the most active outcrop–talus slope systems in southwest China, and it provides a representative case study on the assessment of rockfall hazards at the base of talus slopes. In this article, the formation mechanism and failure mode of this rock-talus system were studied using field investigation, remote sensing image analysis, and numerical simulation. The findings reveal that the lithology and rock mass structure of the study site are controlling factors for outcrop retreat and the progressive development of talus deposits. This process is intensified by rainfall and mining activities. Boulder accumulation on the platform at the middle section of the talus slope serves as top loading for the slope mechanical system. During the boulder–ground interaction, the rockfall impact acts as toe cutting to change the geometry and mechanical balance of the talus slope. It was found that toe cutting significantly influenced the slope stability, which led to a decrease in the antisliding force of the slope. The slope failure induced by rockfalls occurred with the combined effect of top loading and toe cutting on this talus slope. During rockfall prevention and mitigation in this region, the government and residents should consider the geodisaster chain, as this relates to the impact of rockfall on talus slopes, in addition to the risk of damage due to the rockfall trajectory.

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