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Bulletin of Engineering Geology and the Environment

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04-10-2021 | Original Paper

Evolution of hydro-mechanical behaviours and its influence on slope stability for a post-earthquake landslide: implications for prolonged landslide activity

Authors: Zongji Yang, Gang Liu, Liyong Wang, Shihao Liu, Xiaolong Fu

Published in: Bulletin of Engineering Geology and the Environment | Issue 11/2021

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Abstract

There has been considerable research on the prolonged effects and evolution of post-earthquake landslides, as they are of significance for disaster relief and rebuilding plans in earthquake-impacted regions. There is a need to better quantify these prolonged effects and evolution based on the hydro-mechanical mechanisms of post-earthquake landslides. This study investigated the evolution of the hydro-mechanical behaviour and parameters of a single landslide by integrating experimental and theoretical analyses. Analyses were undertaken using a time series of in situ monitoring data over five hydrological years on a single landslide site in the Baisha River basin of Dujiangyan, in the Wenchuan earthquake region, China. Results indicated a linear increase in the angle of internal friction under prolonged effects, while soil cohesion decreased non-linearly, gradually approaching a lower limit. The saturated hydraulic conductivity (\({K}_{s}\)) increased, and the soil residual water content (\({\theta }_{r}\)) evolution curve conformed to the Boltzmann function distribution model. The soil–water characteristic curve parameters gradually increased. Based on the hydro-mechanical parameter evolution, the spatiotemporal decay of the landslide over the next decade under extreme rainfall conditions was predicted using the rainfall slope stability models and TRIGRS. This paper proposed a mechanistic explanation for the prolonged effects of a post-earthquake landslide in response to rainfall. Furthermore, it provided a reliable theoretical basis for the early warning and prevention of such landslides.

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Title: Evolution of hydro-mechanical behaviours and its influence on slope stability for a post-earthquake landslide: implications for prolonged landslide activity
Authors: Zongji Yang
Gang Liu
Liyong Wang
Shihao Liu
Xiaolong Fu
Publication date: 04-10-2021
Publisher: Springer Berlin Heidelberg
Published in: Bulletin of Engineering Geology and the Environment / Issue 11/2021
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-021-02463-4

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