Mechanism of rainfall-induced shallow landslide and stability prediction model

LIU Jiayi; CHEN Chunli; FU Yukai; WANG Chenxing; LI Tonglu; XIAO Ruihua; LIU Yanhui

doi:10.16030/j.cnki.issn.1000-3665.202306051

2024 Vol. 51, No. 2

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LIU Jiayi, CHEN Chunli, FU Yukai, WANG Chenxing, LI Tonglu, XIAO Ruihua, LIU Yanhui. Mechanism of rainfall-induced shallow landslide and stability prediction model[J]. Hydrogeology & Engineering Geology, 2024, 51(2): 183-191. doi: 10.16030/j.cnki.issn.1000-3665.202306051

Citation:

LIU Jiayi, CHEN Chunli, FU Yukai, WANG Chenxing, LI Tonglu, XIAO Ruihua, LIU Yanhui. Mechanism of rainfall-induced shallow landslide and stability prediction model[J]. Hydrogeology & Engineering Geology, 2024, 51(2): 183-191. doi: 10.16030/j.cnki.issn.1000-3665.202306051

Mechanism of rainfall-induced shallow landslide and stability prediction model

1.
College of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi　710054, China
2.
Observation and Research Station of Water Cycle and Geological Environment for the Chinese Loess Plateau, Ministry of Education, Zhengning, Gansu　745399, China
3.
China Institute of Geo-Environment Monitoring（Guide Center of Prevention Technology for Geo-hazards，MNR）, Beijing　100081, China

More Information

Corresponding author: CHEN Chunli, chen_chunli@126.com

Received Date: 28 June 2023

Revised Date: 13 October 2023

Accepted Date: 13 October 2023

Publish Date: 15 March 2024

Abstract

Abstract

The rainfall-induced shallow landslides are primarily debris landslides, which features simultaneity with significant hazard, and the hydrological response mechanism of water table and soil moisture content to precipitation of this type of landslide is sophisticated, which makes it difficult to predict the slope stability accurately. To further study the influence of the rainfall-triggered internal hydrological responses on slope-stability, on-site precipitation infiltration monitoring, correlation analysis and mechanical analysis were carried out on the Houshanli landslide in Qingchuan County, Sichuan Province. The relationship between precipitation and water table was proposed based on climate and hydrological monitoring data obtained within three year interval. The response of rainfall infiltration, soil volumetric water content and water table were analyzed. The results indicate that: (1) groundwater exhibits periodic fluctuations throughout the year, characterized by three phases of slow decline, rapid decline, and rapid ascent; a linear negative correlation between precipitation and water table was found, and no significant correlation was observed with the water table increment; (2) through the infinite slope model and the relationship between precipitation and water table, a prediction model for shallow landslide stability was constructed. The precipitation threshold (81.8 mm/d) and water table threshold (0.73 m) were determined which has good agreement with the actual situations. This provides an early warning method for rainfall-induced shallow landslides by monitoring these two factors.
- debris landslide /
- precipitation /
- water table /
- landslide stability /
- early warning

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References

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