降雨诱发深层老滑坡复活变形的动态作用机制

宋琨; 陈伦怡; 刘艺梁; 易庆林; 董志鸿

doi:10.3799/dqkx.2022.184

Volume 47 Issue 10

Oct. 2022

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Article Navigation > Earth Science > 2022 > 47(10): 3665-3676

Song Kun, Chen Lunyi, Liu Yiliang, Yi Qinglin, Dong Zhihong, 2022. Dynamic Mechanism of Rain Infiltration in Deep-Seated Landslide Reactivate Deformation. Earth Science, 47(10): 3665-3676. doi: 10.3799/dqkx.2022.184

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Song Kun, Chen Lunyi, Liu Yiliang, Yi Qinglin, Dong Zhihong, 2022. Dynamic Mechanism of Rain Infiltration in Deep-Seated Landslide Reactivate Deformation. Earth Science, 47(10): 3665-3676. doi: 10.3799/dqkx.2022.184

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Dynamic Mechanism of Rain Infiltration in Deep-Seated Landslide Reactivate Deformation

doi: 10.3799/dqkx.2022.184

Song Kun^{1, 2
,
,},
Chen Lunyi^{1, 2},
Liu Yiliang^{1, 2},
Yi Qinglin^{2, 3},
Dong Zhihong⁴

1.
Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China
2.
College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China
3.
National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang 443002, China
4.
Yichang Geological Environment Monitor Station, Yichang 443000, China

Received Date: 2022-03-03
Publish Date: 2022-10-25

Abstract

Abstract

Heavy rainfall is a main factor for reactivating the deformation of large deep-seated landslides. Understanding the infiltration mechanism is of great significance to obtaining the rainfall thresholds for landslide reactivation and hence facilitating early warning. Tanjiawan landslide is a well-studied large-scale and deep-seated reactivated landslide in Zigui County of the Three Gorges Reservoir Area. It is therefore considered as a typical example in this study, and the spatiotemporal distribution of surface cracks with time series were described and analyzed herein. 15 years of manual monitoring data and 2 years of real-time monitoring data were employed to analyze the deformation process of the landslide. By exploring the correlation between the displacement and the cumulative as well as antecedent rainfall in the stepping stage, a dynamic mechanism of infiltration was proposed for the reactivated deformation evolution in the deep-seated landslide. It is demonstrated that the 7 stages of step-like deformation were related to the heavy rainfall of the Tanjiawan landslides, but the cumulative horizontal displacement increment had no obvious positive correlation with the cumulative rainfall. Moreover, even when the increment of horizontal displacement is similar, the accumulate rainfall can still be quite different. The cumulative rainfall and maximum daily rainfall that caused the first step deformation were much greater than those in the subsequent stages, and the analysis indicated that it may be controlled by the dynamic mechanism of infiltration. Furthermore, the infiltration has transformed from pore seepage to coupled pore seepage with larger permeability and crack preferential flow. It has a theoretical significance and reference value for further study of the mechanism and early warning of deep-stead landslide reactivation induced by heavy rainfall.
- deep-seated landslide,
- step-like deformation,
- rainfall-induced landslide,
- infiltration mechanism,
- correlation analysis,
- engineering geology

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References(41)

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Dynamic Mechanism of Rain Infiltration in Deep-Seated Landslide Reactivate Deformation

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