Landslide deformation behavior influenced by water level fluctuations of the Three Gorges Reservoir (China)

Song, Kun; Wang, Fawu; Yi, Qinglin; Lu, Shuqiang

doi:10.1016/j.enggeo.2018.10.020

Cited by 112 publications

(29 citation statements)

References 19 publications

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“…In previous studies, the stability of reservoir landslides was generally affected by the combination of reservoir water level fluctuation and rainfall intensity, such as the Huangtupo landslide, Quchi landslide, and Shuping landslide (Tang et al 2015;Huang et al 2018;Song et al 2018). For example, Huang et al (2018), through the analysis of displacement time series, found that the Quchi landslide movement appears as a seasonal cycle correlating with hydrological factors (rainfall and reservoir operation), and faster seasonal displacements are synchronous with low reservoir levels and high precipitation between June and September.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Huang et al (2018), through the analysis of displacement time series, found that the Quchi landslide movement appears as a seasonal cycle correlating with hydrological factors (rainfall and reservoir operation), and faster seasonal displacements are synchronous with low reservoir levels and high precipitation between June and September. Similarly, Tang et al (2015) and Song et al (2018) considered that most reservoir landslide cumulative displacement curves show "step-like" characteristics during the rainy season due to the increase in rainfall and the drawdown of the reservoir water level. However, with varying climate change-induced precipitation conditions, regional precipitation is becoming increasingly intense and sustained (Li et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Based on a long-term analysis of monitoring data, the combined effects of seasonal precipitation conditions and periodic water level fluctuations can influence the slope deformation and stability conditions over time (Wang et al 2008;He et al 2008;Xia et al 2013). With the precipitation increase and the water level decline between May and August, many landslides were reactivated or caused destruction during this period (Song et al 2018;Tang et al 2015). However, with the precipitation decrease in the dry season, in order to ensure the requirements for flood control and improve the economic benefit of hydropower stations, it is necessary to raise the reservoir water level from September to March of the following year.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…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]. A large number of previous studies have shown that the deformation characteristics of these landslides are affected by the hydraulic conditions (e.g., the fluctuation rate of the water level) and the material properties (e.g., permeability and mechanical strength) [19][20][21]. However, further efforts are needed to evaluate the behavior of the macro-geological model.…”

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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“…Since the impoundment of TGR, monitoring systems have been installed on or within many reservoir landslides (Ren et al, 2015;Song et al, 2018;Wu et al, 2019), which provide valuable data for the study of their deformation features. Several studies show that reservoir water level variations and rainfall are the most critical factors that govern the deformation velocities of reservoir landslides in TGR (Li et al, 2010;Tang et al, 2015;Ma et al, 2016;Wang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

A model for interpreting the deformation mechanism of reservoir landslides in the Three Gorges Reservoir area, China

Zou¹,

Tang²,

Criss³

et al. 2020

Preprint

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Abstract. Landslides whose slide surface is gentle near the toe and relatively steep in the middle and rear part are common in the Three Gorges Reservoir area, China. The mass that overlies the steep part of the slide surface is termed the driving section and that which overlies the gentle part of the slide surface is termed the locking section. A driving-locking model is presented to elucidate the deformation mechanism of reservoir landslides of this type, as exemplified by Shuping landslide. More than 13 years of field observations that include rainfall, reservoir level and deformation show that the deformation velocity of Shuping landslide depends strongly on the reservoir level but only slightly on rainfall. Seepage modelling shows that the landslide was destabilized shortly after the reservoir was first impounded to 135 m, which initiated a period of steady deformation from 2003 to 2006 that was driven by buoyancy forces on the locking section. Cyclical water-level fluctuations in subsequent years also affected slope stability, with annual jumps in displacement coinciding with drawdown periods that produce outward seepage forces. In contrast, the inward seepage force that results from rising reservoir levels stabilizes the slope, as indicated by decreased deformation velocity. Corrective transfer of earth mass from the driving section to the locking section successfully reduced the deformation of Shuping landslide, and is a feasible treatment for huge reservoir landslides in similar geological settings.

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Landslide deformation behavior influenced by water level fluctuations of the Three Gorges Reservoir (China)

Cited by 112 publications

References 19 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

A model for interpreting the deformation mechanism of reservoir landslides in the Three Gorges Reservoir area, China

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