The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study
Filling of Xiangjiaba Reservoir Lake in the Southwest China triggered and reactivated numerous landslides due to water fluctuation. In order to understand the relationship between reservoirs and slope instability, a typical reservoir landslide (Dasha landslide) at the right bank of Jinsha River was...
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Wiley
2019-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2019/2374236 |
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| author | Javed Iqbal Xinbin Tu Wei Gao |
| author_facet | Javed Iqbal Xinbin Tu Wei Gao |
| author_sort | Javed Iqbal |
| collection | DOAJ |
| description | Filling of Xiangjiaba Reservoir Lake in the Southwest China triggered and reactivated numerous landslides due to water fluctuation. In order to understand the relationship between reservoirs and slope instability, a typical reservoir landslide (Dasha landslide) at the right bank of Jinsha River was selected as a case study for in-depth investigations. The detailed field investigations were carried out to identify the landslide with respect to its surroundings and to find out the slip surface. Boreholes were drilled to find out the subsurface lithology and the depth of failure of Dasha landslide. The in situ geotechnical tests were performed, and the soil samples from exposed slip surface were retrieved for geotechnical laboratory analysis. Finally, stability analysis was done using the 3D strength reduction method under different conditions of reservoir water level fluctuations and rainfall conditions. The in-depth investigations show that the Dasha landslide is a bedding rockslide which was once activated in 1986. The topography of Dasha landslide is relatively flat, while the back scarp and local terrain is relatively steep. The total volume of landslides is about 580×104 m3 with an average thickness of 20 m. Bedrock in the landslide area is composed of Suining Formation of the Jurassic age. The main rock type is silty mudstone with sandstone, and the bedding orientation is 300~310° ∠ 7~22°. The factor of safety (FOS) of Dasha landslide obtained by 3D strength reduction cannot meet the minimum safety requirement under the working condition of reservoir level fluctuation as designed, with effect of rainfall and rapid drawdown. |
| format | Article |
| id | doaj-art-5474f3852df64a32bc22610a1c3b393d |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
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| series | Geofluids |
| spelling | doaj-art-5474f3852df64a32bc22610a1c3b393d2025-02-03T06:01:10ZengWileyGeofluids1468-81151468-81232019-01-01201910.1155/2019/23742362374236The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case StudyJaved Iqbal0Xinbin Tu1Wei Gao2Key Laboratory for Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards & Environment, Chinese Academy of Sciences, Chengdu, ChinaInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaFilling of Xiangjiaba Reservoir Lake in the Southwest China triggered and reactivated numerous landslides due to water fluctuation. In order to understand the relationship between reservoirs and slope instability, a typical reservoir landslide (Dasha landslide) at the right bank of Jinsha River was selected as a case study for in-depth investigations. The detailed field investigations were carried out to identify the landslide with respect to its surroundings and to find out the slip surface. Boreholes were drilled to find out the subsurface lithology and the depth of failure of Dasha landslide. The in situ geotechnical tests were performed, and the soil samples from exposed slip surface were retrieved for geotechnical laboratory analysis. Finally, stability analysis was done using the 3D strength reduction method under different conditions of reservoir water level fluctuations and rainfall conditions. The in-depth investigations show that the Dasha landslide is a bedding rockslide which was once activated in 1986. The topography of Dasha landslide is relatively flat, while the back scarp and local terrain is relatively steep. The total volume of landslides is about 580×104 m3 with an average thickness of 20 m. Bedrock in the landslide area is composed of Suining Formation of the Jurassic age. The main rock type is silty mudstone with sandstone, and the bedding orientation is 300~310° ∠ 7~22°. The factor of safety (FOS) of Dasha landslide obtained by 3D strength reduction cannot meet the minimum safety requirement under the working condition of reservoir level fluctuation as designed, with effect of rainfall and rapid drawdown.http://dx.doi.org/10.1155/2019/2374236 |
| spellingShingle | Javed Iqbal Xinbin Tu Wei Gao The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study Geofluids |
| title | The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study |
| title_full | The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study |
| title_fullStr | The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study |
| title_full_unstemmed | The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study |
| title_short | The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study |
| title_sort | impact of reservoir fluctuations on reactivated large landslides a case study |
| url | http://dx.doi.org/10.1155/2019/2374236 |
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