Towards a complete understanding of the triggering mechanism of a large reactivated landslide in the Three Gorges Reservoir

Huang, Da; Gu, Dong Ming; Song, Yi; Cen, Duo Feng; Zeng, Bin

doi:10.1016/j.enggeo.2018.03.008

Cited by 118 publications

(24 citation statements)

References 37 publications

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“…Climate change has caused heavy precipitation more frequently from September to October, and the reservoir water level has risen during this period. Under these coexisting conditions, there have also been many major landslide disasters, such as the Shanshucao landslide on September 2, 2014 (Huang et al 2018), the Dahe landslide in Wuxi County on October 21, 2017, and the Yanguan landslide in Zigui County on October 27, 2017. To better understand the impact of this "special hydrological environment" on the deformation behavior of landslides, the Yanguan landslide was analyzed in depth as a case study.…”

Section: Extreme Precipitation-induced Landslide Eventsmentioning

confidence: 99%

Effect of climate change induced extreme precipitation on landslide activity in the Three Gorges Reservoir, China

Zhu

Song

et al. 2020

Bull Eng Geol Environ

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Climate change has caused an increase in extreme rainfall and snowfall in many parts of the world. For example, in the Three Gorges Reservoir area, annual precipitation has gradually increased and the occurrence of heavy precipitation events has become more frequent. As the reservoir water level rises in October, the high water combined with heavy precipitation creates a "special hydrological environment," which recently caused the Yanguan landslide. The Yanguan landslide is a large-scale soil landslide that has undergone two slides, pushed the Yanguan Road Bridge into the reservoir, and caused serious damage to roads and buildings. In the present study, the combined effects of high water and heavy precipitation on landslide deformation characteristics (movement patterns and evolution processes) have been analyzed and a stability evaluation was conducted through a field investigation and numerical simulation. To comparatively analyze these combined effects of high water and heavy precipitation, a two-dimensional finite element model was created, and four cases of the hydrological environment were calculated with the model. Results show that the factor of safety was maintained in the range of 1.013 to 1.059 before the precipitation conditions changed. However, as heavy precipitation increased in October 2017 (reaching 356.4 mm in 1 month), this "special hydrological environment" potentially decreased the FoS to 0.948, which is 9.6% lower than that observed under normal conditions, and helped drive the Yanguan landslide activity. The analysis of these various combined effects can also indicate the impacts of climate change on landslides in other areas of the Three Gorges Reservoir.

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Section: Extreme Precipitation-induced Landslide Eventsmentioning

confidence: 99%

Effect of climate change induced extreme precipitation on landslide activity in the Three Gorges Reservoir, China

Zhu

Song

et al. 2020

Bull Eng Geol Environ

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“…The reservoir water level fluctuated from 145 m in elevation during the flood season to 175 m afterwards, resulting in the reactivation of approximately 800 landslides 12 years after the first impoundment in 2003 [15,17,18]. Seventy percent of the reactivated landslides exhibited severe deformation during the drainage period; however, approximately 16% of the landslides deformed during the filling stage [15].…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling and the Analysis of Ancient Landslides Subjected to Reservoir Water Level Fluctuation

Tang

et al. 2020

Sustainability

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Landslides are among the most severe natural hazards with significant impacts in human life and infrastructure. The Three Gorges Reservoir Area (TGRA) is vulnerable to landslides because of the geological environment and human activities. A centrifuge model test of a landslide with a planar sliding surface in the TGRA was conducted. Based on the multiple monitoring systems composed of a 3D laser scanner, pore water pressure transducers, particle image velocimetry and earth pressure sensors, multiphysical data were obtained. The work described here had the objective of researching the long-term deformation pattern of this kind of landslide that was subjected to periodic fluctuations in the reservoir water level. The results indicated that the failure processes were characterized by progressive retrogression and cracks caused by the reservoir drawdown. Transverse tensile cracks first appeared in the submerged zone of the slope. The front part of the slope was dominated by horizontal displacement, while the consolidation and compaction deformation in the vertical direction dominated at the mid-rear part of the slope. When the water level dropped again, the front part slid down and fell into the river, but the mid-rear part had no obvious deformation and exhibited a phenomenon of self-stabilization. Moreover, the phreatic line is a concave shape directed into the slope during reservoir filling and converts to a convex shape pointing out of the slope during reservoir drawdown. The earth pressures in the slope vary with the failure process of the landslide. Good agreement is obtained for the deformation characteristics between the experimental results and those of prototype landslides.

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“…In addition, indoor model tests and theoretical studies are used to clarify the effects of various detrimental factors such as the fluctuation of water levels, composition of the rock and soil, pore-water pressures and rainfall history, on the dynamic evolution of landslides (Jia et al 2009). Combined with finite element method, finite volume method and digital elevation model, numerical methods can study more in details the sliding mechanism and deformation failure mode of landslides (Li et al 2004;Yan et al 2010;Song et al 2015;Huang and Gu 2017;Huang et al 2018). By adjusting parameters, various reservoir operating conditions can be simulated, and the relationships between various factors can be clearly summarized, providing important indicators for the operation of hydropower stations (Hong et al 2017).…”

Section: Introductionmentioning

confidence: 99%

GIS-based remote sensing analysis of the spatial-temporal evolution of landslides in a hydropower reservoir in southwest China

Gan

Yang

Zhou

2019

Geomatics, Natural Hazards and Risk

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The evolution of reservoir landslides upstream of river buildings is a key issue because landslides continue to cause damage to the ecological environment, especially the safety of dams and the operation of reservoirs. Based on geographic information system (GIS), four high-resolution remote sensing images captured at a hydropower reservoir in southwest China during four different periods are used to interpret landslides. Landslide maps coupled with lithological setting, water level change history and some other factors are used to illustrate the spatial-temporal evolution of landslides in the upstream reservoir of river buildings. The results from this analysis indicate that the landslides are more likely to occur in Quaternary deposits, fractured rock masses and water softened rock masses, whose engineering properties are quite sensitive to water. Three main types of landslides are observed in the reservoir, include gully landslide, bank collapse and deep-seated landslide, among which bank collapse is the dominate type. Fluctuation of water level, together with the human activities and lithological setting, affect the deformation and failure process of the landslides. The deep-seated landslides in the reservoir were observed to experience a relative long period of large deformation until the occurrence of a disaster.

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Towards a complete understanding of the triggering mechanism of a large reactivated landslide in the Three Gorges Reservoir

Cited by 118 publications

References 37 publications

Effect of climate change induced extreme precipitation on landslide activity in the Three Gorges Reservoir, China

Effect of climate change induced extreme precipitation on landslide activity in the Three Gorges Reservoir, China

Centrifuge Modeling and the Analysis of Ancient Landslides Subjected to Reservoir Water Level Fluctuation

GIS-based remote sensing analysis of the spatial-temporal evolution of landslides in a hydropower reservoir in southwest China

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