Deformation characteristics and reactivation mechanism of Hongyanzi landslide in Pubugou reservoir area of the Dadu River

Zhongwen LI; Junfeng LI; Xiaoqiong ZHANG; Yuchi YANG; Pinggen ZHOU; Bing HAN

doi:10.16031/j.cnki.issn.1003-8035.202212015

Volume 34 Issue 4

Aug. 2023

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The Chinese Journal of Geological Hazard and Control > 2023 > 34(4): 1-10. > DOI: 10.16031/j.cnki.issn.1003-8035.202212015

LI Zhongwen，LI Junfeng，ZHANG Xiaoqiong，et al. Deformation characteristics and reactivation mechanism of Hongyanzi landslide in Pubugou reservoir area of the Dadu River[J]. The Chinese Journal of Geological Hazard and Control，2023，34(4): 1-10. DOI: 10.16031/j.cnki.issn.1003-8035.202212015

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Deformation characteristics and reactivation mechanism of Hongyanzi landslide in Pubugou reservoir area of the Dadu River

Zhongwen LI^{1, 2,},
Junfeng LI^{2, 3},
Xiaoqiong ZHANG⁴,
Yuchi YANG⁵,
Pinggen ZHOU²,
Bing HAN^{2, 3, ,}

1.
Chinese Academy of Geological Sciences, Beijing　100037, China
2.
China Institute for Geo-Environment Monitoring （Guide Center of Prevention Technology for Geo-Hazards，MNR）, Beijing　100081, China
3.
Observation and Research Station of Geological Hazard in Sichuan Ya’an, Ministry of Natural Resources, Ya’an, Sichuan　625099, China
4.
Ya’an Municipal Geological Hazard Prevention and Ecological Restoration Center, Ya’an, Sichuan　625099, China
5.
Hanyuan Municipal Planning and Natural Resources Bureau, Ya’an, Sichuan　625300, China

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Received Date: December 26, 2022
Revised Date: April 10, 2023
Accepted Date: May 03, 2023
Available Online: May 10, 2023

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Abstract

Abstract

Reservoir water fluctuation can often trigger deformation and failure of reservoir bank landslides. This study focuses on the Hongyanzi landslide in the Pubugou hydropower Station of the Dadu River to investigate the deformation characteristics and deformation mechanisms of the reservoir bank landslides. Through detailed surface macro deformation surveys, monitoring data analysis, and GeoStudio numerical simulation, the deformation characteristics, seepage field, stability and the influence of reservoir water on landslide were studied in depth. The research revealed significant macro deformation of the Hongyanzi landslide surface, with a cumulative displacement curve exhibiting a “step-like” characteristic. The primary inducing factor of landslide deformation was found to be the decrease in the reservoir water level. When the reservoir water level dropped from 850 m to below 830 m, the displacement step was triggered, and the cumulative deformation of the “step” segment accounted for over 90% of the total annual deformation. Accelerated deformation of the landslide occurred when the rate of the reservoir water level decline was greater than 0.5 m/d. The landslide deformation mode was identified as creep slip-tensile cracking, with the rise and fall of the reservoir water level significantly impacting the internal permeability of the sliding body and causing a large impact on the landslide’s stability, leading to the “step-like” deformation of the landslide.
- reservoir water level,
- deformation characteristics,
- deformation mechanism,
- step,
- Hongyanzi landslide

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Deformation characteristics and reactivation mechanism of Hongyanzi landslide in Pubugou reservoir area of the Dadu River

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