Stability analysis of Gongjiacun landslide in the three Gorges Reservoir area under the action of reservoir water level fluctuation and rainfall

Hou, Tian-shun; Xu, Guangli; Zhang, Da-qian; Liu, Haoyu

doi:10.1007/s11069-022-05441-5

Cited by 17 publications

(7 citation statements)

References 21 publications

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“…The evolution of the seepage field within reservoir landslides is intricately influenced by rainfall and reservoir water level fluctuation [13][14][15][16][17]. This dynamic interplay disrupts the pre-existing equilibrium of the landslide, thereby exerting a consequential impact on its stability [18][19][20][21][22][23][24][25][26]. Particularly, the phreatic line serves as an effective delineator of seepage flow information within the landslide.…”

Section: Introductionmentioning

confidence: 99%

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Zhang,

Ma,

Yuan

et al. 2024

Water

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A seepage field, influenced by rainfall and reservoir water level fluctuation, is closely associated with the stability of the reservoir landslide. Understanding the phreatic line variation inside the landslide is of significant importance for the analysis and evaluation of slope stability. Currently, most of the boundaries of phreatic line analytical models and the hydrological conditions are simplified, resulting in discrepancies between the outcomes derived from these models and the actual situation. Given this, the newly proposed analytical model is refined by addressing the following two issues. Firstly, the consideration of variable-speed reservoir level fluctuations is incorporated, and secondly, the reservoir bank within the water-level fluctuation zone is treated as non-vertical. Under the combined effect of reservoir water level fluctuation and rainfall, the Boussinesq Differential Equation of unsteady seepage is established and applied to the Majiagou landslide in Three Gorges reservoir area. The results of the analytical solution are basically consistent with the measured groundwater level results, which has demonstrated the accuracy of the proposed model. Consequently, the proposed model can quickly and accurately calculate the groundwater level of landslides, which provides an effective means for the prediction and early warning of reservoir landslides.

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Section: Introductionmentioning

confidence: 99%

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Zhang,

Ma,

Yuan

et al. 2024

Water

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“…In addition, it is important to consider alterations in soil properties and the water table resulting from rainfall (Wang et al, 2022;Hou et al, 2022). Recently, the majority of research on landslide tragedies affecting reservoir escarpments has centred on the Yangtze River Basin in China, particularly the Three Gorges Reservoir (Wang et al, 2004;He et al, 2010;Zhang et al, 2020;Deng et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Characteristics and mechanism of landslides on highway landfill along Xiaolangdi Reservoir of the Yellow River: a case study

Yang,

Chen

2024

Nat Hazards

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On February 17, 2023, a landslide occurred on a highway slope located on the bank of Xiaolangdi Reservoir of the Yellow River, with a volume of about 1,200 m 3 , which directly led to the interruption of the road and had a serious social impact. In this paper, the area where the landslide was located was studied and analyzed by means of field investigation, remote sensing images, laboratory tests and numerical simulation. The evolution pattern of landslide groups under the influence of human engineering activities is traced, and the disaster-causing mechanism of landslides is investigated in terms of climatic factors, water level changes, stress changes, and the nature of the fill. The results indicate that: (1) Water level changes can lead to a decrease in the stability coefficient of ancient landslides, but have no direct effect on the occurrence of landslides.The change of soil stress caused by artificial excavation will change the distribution of soil plastic region, which makes the potential sliding surface changing; (2) Rainfall and temperature are the key elements affecting the fill-type landslides, and the alternating period between winter and 2 spring is the high susceptibility period of landslides; (3) Sandstone stratigraphy undergoes significant expansion and deformation under freeze-thaw action, so additional monitoring of bedrock deformation can be considered when monitoring fill-bedrock slopes.

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“…However, collapse and landslide often occur in the loess area after encountering water. In order to study the instability mechanism of loess slope under rainfall, a large number of indoor model tests and field tests are conducted on the loess slope (Hou et al, 2021(Hou et al, , 2022. The infiltration law and deformation failure mode of loess slope under rainfall are studied by field tests.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional slope stability and anti-slide pile treatment of Zhangjiayao landslide under rainfall

Han,

Hou,

Chen

2023

Self Cite

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PurposeTo solve the instability problem of Zhangjiayao landslide caused by rainfall, the internal mechanism of slope instability and the supporting effect of anti-slide piles are studied. The research results can provide theoretical basis for the prevention and control of loess landslides.Design/methodology/approachA three-dimensional finite element model of Zhangjiayao landslide is established by field geological survey, laboratory test and numerical simulation.FindingsThe results show that Zhangjiayao landslide is a loess-mudstone contact surface landslide, and rainfall leads to slope instability and traction landslide. The greater the rainfall intensity, the faster the pore water pressure of the slope increases and the faster the matrix suction decreases. The longer the rainfall duration, the greater the pore water pressure of the slope and the smaller the matrix suction. Anti-slide pile treatment can significantly improve slope stability. The slope safety factor increases with the increase of embedded depth of anti-slide pile and decreases with the increase of pile spacing.Originality/valueBased on the unsaturated soil seepage theory and finite element strength reduction method, the failure mechanism of Zhangjiayao landslide was revealed, and the anti-slide pile structure was optimized and designed based on the pile-soil interaction principle. The research results can provide theoretical basis for the treatment of loess landslides.HighlightsA three-dimensional finite element model of Zhangjiayao landslide is established.Zhangjiayao landslide is a loess-mudstone contact surface landslide.The toe of Zhangjiayao slope is first damaged by heavy rainfall, resulting in traction landslide.The deformation of Zhangjiayao slope is highly dependent on rainfall intensity and duration.The anti-slide pile can effectively control the continuous sliding of Zhangjiayao slope.

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Stability analysis of Gongjiacun landslide in the three Gorges Reservoir area under the action of reservoir water level fluctuation and rainfall

Cited by 17 publications

References 21 publications

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Characteristics and mechanism of landslides on highway landfill along Xiaolangdi Reservoir of the Yellow River: a case study

Three-dimensional slope stability and anti-slide pile treatment of Zhangjiayao landslide under rainfall

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