The critical mechanics of the initiation of loess flow failure and implications for landslides

doi:10.1016/j.enggeo.2021.106165

	The critical mechanics of the initiation of loess flow failure and implications for landslides
	Feng, Li 1,7; Zhang, Shanshan 2; Jin, Zhao 1,5; Zhang, Maosheng 3; Sun, Pingping 4; Jia, Jun 4; Chu, Guangchen 1; Hu, Wei 6
刊名	ENGINEERING GEOLOGY
	2021-07-01
卷号	288 页码:16
关键词	Loess landslides Flow failure pattern Critical state mechanics Critical hydromechanical trajectory
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2021.106165
通讯作者	Jin, Zhao(jinzhao@ieecas.cn)
英文摘要	An essential hypothesis is that the flow failure landslides occurring in the Chinese Loess Plateau may initiate in the high-moisture-content loess in the capillary zone rather than in the saturated zone within the slope. Two effective stress paths, namely, the monotonically increasing loading and wetting-based constant loading under undrained conditions, are performed on intact and mechanically compacted loess, aiming at specifying their hydromechanical trajectories when subjected to an increasing water content. The results indicate that static liquefaction is initiated when the soil moisture reaches a threshold during the wetting process after exhibiting a sharp increase in pore water pressure accompanied by strain-softening behavior. Accordingly, we define this state as the initiation of flow failure under the unsaturated framework to distinguish it from static liquefaction, and first propose its corresponding critical mechanics and criterion. Its validity and physical justification are mainly evidenced by the following observations: i) Significant difference in the pore characteristics of the test samples before and after flow failure initiation; ii) Approximate equivalence between the measured and predicted hydromechanical thresholds at the flow failure initiation state; iii) Existence of the strength envelope corresponding to the flow failure initiation state; and iv) The uniqueness of the modified critical state line in the full suction range. This paper provides a general approach to accurately identify the flow failure potential for unsaturated loess, especially in the capillarity zone within a slope, which is of vital importance to the early identification and risk mitigation of loess landslides with a fluidization pattern.
资助项目	National Key Research and Development Program of China[2018YFC1504701] ; National Natural Science Foundation of China[41790444] ; National Natural Science Foundation of China[41530640] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB40020100]
WOS关键词	STRESS CHARACTERISTIC CURVE ; SATURATED SILTY LOESS ; HEIFANGTAI TERRACE ; SHEAR-STRENGTH ; SOIL ; PLATEAU ; SLOPE ; EVOLUTION ; BEHAVIOR ; SUCTION
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000655073200025
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/16726]
专题	地球环境研究所_生态环境研究室第四纪科学与全球变化卓越创新中心
通讯作者	Jin, Zhao
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.China Natl Adm Coal Geol, Aerial Photogrammetry & Remote Sensing Bur, Xian 710199, Peoples R China 3.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Dept Civil Engn, Xian, Peoples R China 4.China Geol Survey, Key Lab Geohazard Loess Area, Minist Nat Resources, Xian Ctr, Xian 710054, Peoples R China 5.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 6.Colorado Sch Mines, Golden, CO 80401 USA 7.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Feng, Li,Zhang, Shanshan,Jin, Zhao,et al. The critical mechanics of the initiation of loess flow failure and implications for landslides[J]. ENGINEERING GEOLOGY,2021,288:16.
APA	Feng, Li.,Zhang, Shanshan.,Jin, Zhao.,Zhang, Maosheng.,Sun, Pingping.,...&Hu, Wei.(2021).The critical mechanics of the initiation of loess flow failure and implications for landslides.ENGINEERING GEOLOGY,288,16.
MLA	Feng, Li,et al."The critical mechanics of the initiation of loess flow failure and implications for landslides".ENGINEERING GEOLOGY 288(2021):16.