气候变化领域集成服务门户(CCPortal): Initiation mechanism of mudflow-like loess landslide induced by the combined effect of earthquakes and rainfall

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DOI	10.1007/s11069-020-04442-6
	Initiation mechanism of mudflow-like loess landslide induced by the combined effect of earthquakes and rainfall
	Pu X.; Wan L.; Wang P.
发表日期	2021
ISSN	0921030X
起始页码	3079
结束页码	3097
卷号	105 期号:3
英文摘要	The events of landslides induced by the combined effect of earthquakes and rainfall are more dangerous than those induced by earthquake or rainfall. The Yongguang loess landslide induced by the Minxian–Zhangxian Ms 6.6 earthquake in 2013 is a typical example of a landslide induced by the combined effect of an earthquake and rainfall. A few scholars have carried out relevant research on this landslide, but the initiation mechanism of this kind of landslide has not been elucidated. Therefore, the initiation mechanism of loess landslide under the combined effect of earthquakes and rainfall is studied through indoor geotechnical tests, shaking table slope model tests and numerical simulations. The indoor geotechnical tests show that the mechanical properties of Q3 loess would change significantly (the mechanical strength would decrease sharply) when soaked in water and that its strength would be further lowered under dynamic action. The slope model test results show that the infiltration depth at the slope top is deeper than that of the slope surface after continuous heavy artificial rainfall and that the natural frequency of the shoulder of the front edge of the slope top is closer to the frequency of the loading wave than it is in other parts of the slope; so the amplification effect of the seismic ground motion at the shoulder of the front edge of the slope top is more significant and the soil damage is more serious under seismic dynamic action. With the rapid increase in the residual deformation and pore water pressure of the soil mass, the loess properties change substantially, that is, loess liquefaction occurs when the pore water pressure and residual deformation reach a certain threshold. Under the action of the subsequent seismic ground motion, the liquefied loess mass of the front edge of the slope top rushes out along the sliding bed and slides down the slope surface in the form of a loess mudflow; that is, a mudflow-like loess landslide is induced. A simplified mechanical model is used in the numerical simulation test and can reproduce the triggering process of this kind of loess landslide. In this research, the initiation mechanism of mudflow-like loess landslide induced by the combined effect of earthquakes and rainfall is revealed by comprehensively considering a variety of test results, and a sliding distance calculation formula is proposed, providing a foundation for the prevention and control of this kind of landslide disaster. © 2021, Springer Nature B.V.
关键词	Combining effect Earthquake Loess slope Rainfall Shaking table test
英文关键词	earthquake; landslide; loess; mudflow; rainfall; shaking table test; slope; Juncus
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206506
作者单位	Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China; College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China; Key Lab on Loess Earthquake Engineering, China Earthquake Administration, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Pu X.,Wan L.,Wang P.. Initiation mechanism of mudflow-like loess landslide induced by the combined effect of earthquakes and rainfall[J],2021,105(3).
APA	Pu X.,Wan L.,&Wang P..(2021).Initiation mechanism of mudflow-like loess landslide induced by the combined effect of earthquakes and rainfall.Natural Hazards,105(3).
MLA	Pu X.,et al."Initiation mechanism of mudflow-like loess landslide induced by the combined effect of earthquakes and rainfall".Natural Hazards 105.3(2021).