An experimental study of spatial-temporal evolution of water-soil response and stability of a rainfall-induced accumulation landslide

MENG Shengyong; JIANG Xingyuan; YANG Yi; SUN Qianzheng; SHI Wenbing

doi:10.16030/j.cnki.issn.1000-3665.202204014

2023 Vol. 50, No. 1

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MENG Shengyong, JIANG Xingyuan, YANG Yi, SUN Qianzheng, SHI Wenbing. An experimental study of spatial-temporal evolution of water-soil response and stability of a rainfall-induced accumulation landslide[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 104-112. doi: 10.16030/j.cnki.issn.1000-3665.202204014

Citation:

MENG Shengyong, JIANG Xingyuan, YANG Yi, SUN Qianzheng, SHI Wenbing. An experimental study of spatial-temporal evolution of water-soil response and stability of a rainfall-induced accumulation landslide[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 104-112. doi: 10.16030/j.cnki.issn.1000-3665.202204014

An experimental study of spatial-temporal evolution of water-soil response and stability of a rainfall-induced accumulation landslide

1.
College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou　550025, China
2.
Key Laboratory of Karst Geological Resources and Environment of Ministry of Education, Guizhou University, Guiyang, Guizhou　550025, China
3.
Bureau of Geology and Mineral Exploration and Development Bureau 104 Geological Brigade, Duyun, Guizhou　558000, China

More Information

Corresponding author: JIANG Xingyuan, xyjiang3@gzu.edu.cn

Received Date: 11 April 2022

Revised Date: 16 June 2022

Accepted Date: 25 July 2022

Publish Date: 15 January 2023

Abstract

Abstract

The change of soil and water mechanics caused by rainfall infiltration in loose soil is the key to affect stability. At present, most studies focus on the influence of particle size, content and other factors on slope failure. However, the research on the internal water-soil response and spatial-temporal evolution of slope stability is insufficient. Based on a field landslide case, this study explores the deformation and failure processes and mode of loose accumulation slope triggered by rainfall through the flume test, soil mechanics test, and theoretical analysis. The Van Genuchten model (VG model) is used to reconstruct the soil-water characteristic curve of the soil, and the mechanical change of soil and water in the slope and the temporal and spatial evolution of stability are mainly explored. The results show that: (1) The failure processes of the accumulation slope emerge in three stages, that is, the micro-fracture development stage, local failure stage and complete collapse stage, presenting the failure mode of “initial cracking-slope collapsing-plastic sliding”. (2) The volumetric water content and pore water pressure of slope increase rapidly during infiltration, while the matric suction between soil particles decreases or even dissipates, which promotes the development of slope failure. (3) The mechanical strength of soil decreases exponentially with the increasing volumetric water content. When the volumetric water content is 36.3%, the effective cohesion and effective internal friction angle are only 0.27 kPa and 3.39°. (4) Based on the limit equilibrium theory and the monitoring data of slope soil-water characteristics, the spatio-temporal evolution map of slope stability is constructed, which is in good agreement with the failure characteristics of the model test. The research results provide theoretical support for monitoring and early warning of accumulation slope under rainfall and disaster prevention and mitigation.
- accumulation slope /
- rainfall infiltration /
- flume test /
- stability analysis /
- hydrological response

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References

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