Mechanism for the rapid motion of the Qianjiangping landslide during reactivation by the first impoundment of the Three Gorges Dam reservoir, China

Wang, Fawu; Zhang, Yeming; Huo, Zhitao; Peng, Xuanming; Wang, Shimei; Yamasaki, Shintaro

doi:10.1007/s10346-008-0130-7

Cited by 110 publications

(35 citation statements)

References 7 publications

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“…In addition, the variations of several key parameters can be monitored during shearing. Detailed information about the ring shear test is provided by Sassa (1984), Sassa et al (2003Sassa et al ( , 2004, Wang et al (2002Wang et al ( , 2012, Agung et al (2004), Wang and Sassa (2007), and Zhang et al (2011).…”

Section: Recent Landslides Landslidesmentioning

confidence: 99%

Mechanisms of rainfall-induced landslides in gently inclined red beds in the eastern Sichuan Basin, SW China

2015

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Red beds are widespread in the eastern Sichuan Basin, SW China, and are often called Blandslide prone strata^. The dip angle of these red beds is commonly less than 10°, which is much less than the angle of internal friction between the bedding planes. Thus, in theory, failure will not occur along the bedding planes in such strata. We used field methods, numerical modeling, and ring shear tests to investigate the effects of rainfall on landslides in shallow-dipping red beds, using the Qingning landslide in SW China as an example. Our results suggest that the probable mechanisms leading to failure are (1) permeation of rainfall through the cracks at the back of the landslide site that increases the hydrostatic water pressure, which adds to the sliding stress and reduces the effective stress on the failure surface, gradually destabilizing the mass. In the Qingning landslide, the maximum water pressure was as high as 21.8 m before failure. When the factor of safety decreased markedly to 1.015, the sliding mass started to slowly slide.(2) As sliding takes place, the sliding zone soil is under undrained shear and its shear strength decreases sharply to a critical value, which promotes rapid sliding. In the Qingning landslide, the shear resistance of the sliding zone soil decreased markedly to 25.9 kPa as the pore water pressure increased to 118.3 kPa. This study may provide a theoretical basis for landslide forecasting in gently inclined red beds of the eastern Sichuan Basin as well as in similar geological settings worldwide.

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Section: Recent Landslides Landslidesmentioning

confidence: 99%

Mechanisms of rainfall-induced landslides in gently inclined red beds in the eastern Sichuan Basin, SW China

2015

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“…The first impoundment of the Three Gorges dam in 2003 activated many ancient landslides such as the Qianjiangping landslide [24], the Shuping landslide [25] etc. The Shuping landslide is located at the south bank of Yangtze River as shown in Figure 1a.…”

Section: The Shuping Landslidementioning

confidence: 99%

Landslide Displacement Monitoring with Split-Bandwidth Interferometry: A Case Study of the Shuping Landslide in the Three Gorges Area

et al. 2017

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Landslides constitute a major threat to people's lives and property in mountainous regions such, as in the Three Gorges area in China. Synthetic Aperture Radar Interferometry (InSAR) with its wide coverage and unprecedented displacement measuring capabilities has been widely used in landslide monitoring. However, it is difficult to apply traditional InSAR techniques to investigate landslides having large deformation gradients or moving primarily in north-south direction. In this study, we propose a time series split-bandwidth interferometry (SBI) procedure to measure two dimensional (azimuth and range) displacements of the Shuping landslide in the Three Gorges area with 36 TerraSAR-X high resolution spotlight (HS) images acquired from February 2009 to April 2010. Since the phase based SBI procedure is sensitive to noise, we focused on extracting displacements of corner reflectors (CRs) installed on or surrounding the Shuping landslide. Our results agreed well with measurements obtained by the point-like targets offset tracking (PTOT) technique and in-situ GPS stations. Centimeter level accuracy could be achieved with SBI on CRs which shows great potential in futures studies on fast moving geohazards.

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“…The water level of the upstream Yangtze River and the weekly cumulative rainfall in Fengjie during the period from 2007 to 2011 are plotted in Figure 2. Many landslide disasters have happened in this area, such as the Xintan landslide in 1985 [2] and the Qianjiangping landslide in 2003 [18]. The wide distribution of landslides can be attributed in large part to a combination of lithological composition, planar geological structures, and climate conditions [2].…”

Section: Introductionmentioning

confidence: 99%

“…The huge water level fluctuations since the initial impoundment in 2003 make the conditions in this area more complex. The Qianjiangping landslide occurred a few days after the impoundment [18].…”

Section: Introductionmentioning

confidence: 99%

Wide-Area Landslide Deformation Mapping with Multi-Path ALOS PALSAR Data Stacks: A Case Study of Three Gorges Area, China

Shi

Liao

et al. 2016

Remote Sensing

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Abstract:In recent years, satellite synthetic aperture radar interferometry (InSAR) has been adopted as a spaceborne geodetic tool to successfully measure surface deformation of a few well-known landslides in the Three Gorges area. In consideration of the fact that most events of slope failure happened at places other than those famous landslides since the reservoir impoundment in 2003, focusing on a limited number of slopes is insufficient to meet the requirements of regional-scale landslide disaster prevention and early warning. As a result, it has become a vital task to evaluate the overall stability of slopes across the vast area of Three Gorges using wide-coverage InSAR datasets. In this study, we explored the approach of carrying out joint analysis of multi-path InSAR data stacks for wide-area landslide deformation mapping. As an example, three ALOS (Advanced Land Observing Satellite) PALSAR (Phased Array type L-band Synthetic Aperture Radar) data stacks of neighboring ascending paths covering the area along the Yangtze River from Fengjie to Zigui were analyzed. A key problem to be solved is the separation of the tropospheric signal from the interferometric phase, for which we employed a hybrid description model of the atmospheric phase screen (APS) to improve APS estimation from time series interferograms. The estimated atmospheric phase was largely correlated with the seasonal rainfall in the temporal dimension. The experimental results show that about 30 slopes covering total areas of 48 km 2 were identified to be landslides in active deformation and should be kept under routine surveillance. Analyses of time series displacement measurements revealed that most landslides in the mountainous area far away from Yangtze River suffered from linear deformation, whereas landslides located on the river bank were destabilized predominantly by the influences of reservoir water level fluctuation and rainfall.

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Mechanism for the rapid motion of the Qianjiangping landslide during reactivation by the first impoundment of the Three Gorges Dam reservoir, China

Cited by 110 publications

References 7 publications

Mechanisms of rainfall-induced landslides in gently inclined red beds in the eastern Sichuan Basin, SW China

Mechanisms of rainfall-induced landslides in gently inclined red beds in the eastern Sichuan Basin, SW China

Landslide Displacement Monitoring with Split-Bandwidth Interferometry: A Case Study of the Shuping Landslide in the Three Gorges Area

Wide-Area Landslide Deformation Mapping with Multi-Path ALOS PALSAR Data Stacks: A Case Study of Three Gorges Area, China

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