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The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study
Iqbal, Javed1,2; Tu, Xinbin2,3; Gao, Wei2
Corresponding AuthorIqbal, Javed(javediqbalgeo@gmail.com) ; Gao, Wei(gaowei@mail.iggcas.ac.cn)
2019
Source PublicationGEOFLUIDS
ISSN1468-8115
Pages16
AbstractFilling 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 x 10(4) m(3) 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 similar to 310 degrees angle 7 similar to 22 degrees. 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.
DOI10.1155/2019/2374236
Indexed BySCI
Language英语
Funding ProjectChinese Academy of Sciences President's International Fellowship Initiative[2018PC0009] ; Institute of Geology and Geophysics
WOS Research AreaGeochemistry & Geophysics ; Geology
WOS SubjectGeochemistry & Geophysics ; Geology
WOS IDWOS:000466353800001
Funding OrganizationChinese Academy of Sciences President's International Fellowship Initiative ; Institute of Geology and Geophysics
PublisherWILEY-HINDAWI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25956
Collection中国科学院水利部成都山地灾害与环境研究所
Corresponding AuthorIqbal, Javed; Gao, Wei
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Sichuan, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.State Grid Corp China, Beijing 100031, Peoples R China
Recommended Citation
GB/T 7714
Iqbal, Javed,Tu, Xinbin,Gao, Wei. The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study[J]. GEOFLUIDS,2019:16.
APA Iqbal, Javed,Tu, Xinbin,&Gao, Wei.(2019).The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study.GEOFLUIDS,16.
MLA Iqbal, Javed,et al."The Impact of Reservoir Fluctuations on Reactivated Large Landslides: A Case Study".GEOFLUIDS (2019):16.
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