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Response mechanism of post-earthquake slopes under heavy rainfall
Qiu, Hong-zhi1; Kong, Ji-ming2; Wang, Ren-chao2,3; Cui, Yun2; Huang, Sen-wang2,3
Corresponding AuthorHong-zhi Qiu ; Ji-ming Kong
AbstractThis paper uses the catastrophic landslide that occurred in Zhongxing Town, Dujiangyan City, as an example to study the formation mechanism of landslides induced by heavy rainfall in the post-Wenchuan earthquake area. The deformation characteristics of a slope under seismic loading were investigated via a shaking table test. The results show that a large number of cracks formed in the slope due to the tensile and shear forces of the vibrations, and most of the cracks had angles of approximately 45A degrees with respect to the horizontal. A series of flume tests were performed to show how the duration and intensity of rainfall influence the responses of the shaken and non-shaken slopes. Wetting fronts were recorded under different rainfall intensities, and the depth of rainfall infiltration was greater in the shaken slope than in the non-shaken slope because the former experienced a greater extreme rainfall intensity under the same early rainfall and rainfall duration conditions. At the beginning of the rainfall infiltration experiment, the pore water pressure in the slope was negative, and settling occurred at the top of the slope. With increasing rainfall, the pore water pressure changed from negative to positive, and cracks were observed on the back surface of the slope and the shear outlet of the landslide on the front of the slope. The shaken slope was more susceptible to crack formation than the non-shaken slope under the same rainfall conditions. A comparison of the responses of the shaken and non-shaken slopes under heavy rainfall revealed that cracks formed by earthquakes provided channels for infiltration. Soil particles in the cracks of slopes were washed away, and the pore water pressure increased rapidly, especially the transient pore water pressure in the slope caused by short-term concentrated rainfall which decreased rock strength and slope stability.
KeywordDamaged Slope Rainfall-induced Landslide Post-earthquake Slope Flume Test Rainfall Infiltration
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedGeochemistry & Geophysics
Indexed BySCI
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000404902900018
Funding OrganizationNational Natural Science Foundation of China(41401608 ; National High Technology Research and Development Program of China ("863" Project)(2012AA121302) ; 41302284)
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chengdu Univ, Sch Architecture & Civil Engn, Chengdu, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Qiu, Hong-zhi,Kong, Ji-ming,Wang, Ren-chao,et al. Response mechanism of post-earthquake slopes under heavy rainfall[J]. JOURNAL OF SEISMOLOGY,2017,21(4):869-884.
APA Qiu, Hong-zhi,Kong, Ji-ming,Wang, Ren-chao,Cui, Yun,&Huang, Sen-wang.(2017).Response mechanism of post-earthquake slopes under heavy rainfall.JOURNAL OF SEISMOLOGY,21(4),869-884.
MLA Qiu, Hong-zhi,et al."Response mechanism of post-earthquake slopes under heavy rainfall".JOURNAL OF SEISMOLOGY 21.4(2017):869-884.
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