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Morphology and inner structure of Luanshibao rock avalanche in Litang, China and its implications for long-runout mechanisms
Zeng, Qingli1,2; Zhang, Luqing3; Davies, Timothy4; Yuan, Guangxiang5; Xue, Xinyu2; Wei, Rongqiang2; Yin, Qianfeng2; Liao, Liye5
2019-10-03
Source PublicationENGINEERING GEOLOGY
ISSN0013-7952
Volume260Pages:19
AbstractLarge rock avalanches usually move rapidly and travel long distances, making them extremely hazardous, and often result in catastrophic damages. The currently proposed hypotheses for the mechanisms causing their high mobility remain controversial (Petley, 2013). The Luanshibao ancient granite rock avalanche, with a Be-10 exposure age of 3510 +/- 346 years B.P. and a deposit volume of 67 Mm(3), straddles on the Litang active fault and was deposited on an open-flat river terrace without confinement. It travelled about 4000 m, with an apparent coefficient of friction of 0.22. Field investigation, interpretation of satellite images, and study of the morphology and inner structure of its deposit were used to analyze its kinetics and dynamics, and its long runout mechanisms. The study showed that there was probably a two-stage movement transition from rock-slope collapsing to debris spreading, based on the remarkable high secondary scarps and a long belt of bare blocks. The runout is closely related to the volume detached from the secondary scarp. Three different kinds of deposit morphologies were recognized, i.e., parallel transverse ridge-grooves, X grooves and rhombic platforms, and round-elliptical hummocks, from the proximal to the distal end, indicating the strain response to stresses in the debris in motion due to compression, shear and tension, respectively. These deposit morphologies as well as the inner structures such as homogeneous layers of blocks, inner shear belts and jigsaw fractured blocks, suggested that the extra runout debris moved as a pattern of "laminar-flow" or as a "flow-sheet". However, the strong mixing of fluvial pebbles and avalanche debris in the distal hummocky zone suggested a pattern of "turbulent flow". The possible liquefaction of saturated fluvial sediments by a triggering strong earthquake, the extra pore pressure generated by the high-speed undrained shearing of debris in the substrate and the entrainment of a large amount of Quaternary sediment, could have contributed to the great reduction of friction of the basal layer. The particle size decreasing with distance away from the secondary scarps and the disintegration of jigsaw structures, suggest that rock fragmentation occurred during motion. This implies that the long runout of the rock avalanche resulted from many factors.
KeywordRock avalanche Geomorphic features Inner structures Basal friction reduction Long runout mechanism Maoya basin
DOI10.1016/j.enggeo.2019.105216
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council
WOS KeywordSE TIBETAN PLATEAU ; LANDSLIDE MOBILITY ; INTERNAL STRUCTURE ; DEBRIS ; FRAGMENTATION ; DYNAMICS ; SLIDE ; ROCKSLIDES ; MORAINES ; HAZARD
Language英语
Funding ProjectNational Natural Science Foundation of China[41772382] ; National Natural Science Foundation of China[U1704243] ; China Scholarship Council
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000495469800045
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95760
Collection页岩气与地质工程院重点实验室
Corresponding AuthorZeng, Qingli
Affiliation1.Chinese Acad Sci, Key Lab Comp Earth Dynam, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Univ Canterbury, Dept Geosci, Christchurch 8041, New Zealand
5.North China Univ Water Resources & Elect Power, Coll Resources & Environm, Zhengzhou 450045, Henan, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Qingli,Zhang, Luqing,Davies, Timothy,et al. Morphology and inner structure of Luanshibao rock avalanche in Litang, China and its implications for long-runout mechanisms[J]. ENGINEERING GEOLOGY,2019,260:19.
APA Zeng, Qingli.,Zhang, Luqing.,Davies, Timothy.,Yuan, Guangxiang.,Xue, Xinyu.,...&Liao, Liye.(2019).Morphology and inner structure of Luanshibao rock avalanche in Litang, China and its implications for long-runout mechanisms.ENGINEERING GEOLOGY,260,19.
MLA Zeng, Qingli,et al."Morphology and inner structure of Luanshibao rock avalanche in Litang, China and its implications for long-runout mechanisms".ENGINEERING GEOLOGY 260(2019):19.
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