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The cyclic expansion and contraction characteristics of a loess slope and implications for slope stability

文献类型：期刊论文

作者Lan, Hengxing1,2; Zhao, Xiaoxia1,3; Macciotta, Renato4; Peng, Jianbing2; Li, Langping1; Wu, Yuming1; Zhu, Yanbo2; Liu, Xin2; Zhang, Ning2; Liu, Shijie2
刊名SCIENTIFIC REPORTS
出版日期2021-01-26
卷号11期号:1页码:14
ISSN号2045-2322
DOI10.1038/s41598-021-81821-4
通讯作者Lan, Hengxing(Lanhx@igsnrr.ac.cn) ; Macciotta, Renato(macciott@ualberta.ca)
英文摘要Loess covers approximately 6.6% of China and forms thick extensive deposits in the northern and northwestern parts of the country. Natural erosional processes and human modification of thick loess deposits have produced abundant, potentially unstable steep slopes in this region. Slope deformation monitoring aimed at evaluating the mechanical behavior of a loess slope has shown a cyclic pattern of contraction and expansion. Such cyclic strain change on the slope materials can damage the loess and contribute to slope instability. The site showing this behavior is a 70-m high loess slope near Yan'an city in Shanxi Province, northwest China. A Ground-Based Synthetic Aperture Radar (GB-SAR) sensor and a displacement meter were used to monitor this cyclic deformation of the slope over a one-year period from September 2018 to August 2019. It is postulated that this cyclic behavior corresponds to thermal and moisture fluctuations, following energy conservation laws. To investigate the validity of this mechanism, physical models of soil temperature and moisture measured by hygrothermographs were used to simulate the observed cyclic deformations. We found good correlations between the models based on the proposed mechanism and the exhibited daily and annual cyclic contraction and expansion. The slope absorbed energy from the time of maximum contraction to the time of maximum expansion, and released energy from the time of maximum expansion to the time of maximum contraction. Recoverable cyclic deformations suggest stresses in the loess are within the elastic range, and non-recoverable cyclic deformations suggest damage of the loess material (breakage of bonds between soil grains), which could lead to instability. Based on these observations and the models, we developed a quantitative relationship between weather cycles and thermal deformation of the slope. Given the current climate change projections of temperature increases of up to 3.5 degrees C by 2100, the model estimates the loess slope to expand about 0.35 mm in average, which would be in addition to the current cyclic "breathing" behavior experienced by the slope.
WOS关键词SOIL ; DEFORMATION ; ROCK ; COMPENSATION ; EROSION ; SAR
资助项目National Natural Science Foundation of China[41790443] ; National Natural Science Foundation of China[41927806] ; National Natural Science Foundation of China[41941019] ; National Natural Science Foundation of China[41421001] ; National Key R&D Program of China[2019YFC1520601] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0904] ; Strategic Priority Research Program of Chinese Academy of Sciences (CAS)[XDA23090301] ; Strategic Priority Research Program of Chinese Academy of Sciences (CAS)[XDA19040304] ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences (CAS)[QYZDY-SSW-DQC019]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000667511400004
出版者NATURE RESEARCH
资助机构National Natural Science Foundation of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; Strategic Priority Research Program of Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences (CAS)
源URL[http://ir.igsnrr.ac.cn/handle/311030/163805]  
专题中国科学院地理科学与资源研究所
通讯作者Lan, Hengxing; Macciotta, Renato
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, LREIS, Datun Rd 11A, Beijing 100101, Peoples R China
2.Changan Univ, Sch Geol Engn & Geomat, Xian 710054, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Alberta, Dept Civil & Environm Engn, 6-207,9211 116 St, Edmonton, AB T6G 1H9, Canada
5.Simon Fraser Univ, Dept Earth Sci, 8888 Univ Dr, Burnaby, BC V5A 1S6, Canada
推荐引用方式
GB/T 7714		 Lan, Hengxing,Zhao, Xiaoxia,Macciotta, Renato,et al. The cyclic expansion and contraction characteristics of a loess slope and implications for slope stability[J]. SCIENTIFIC REPORTS,2021,11(1):14.
APA Lan, Hengxing.,Zhao, Xiaoxia.,Macciotta, Renato.,Peng, Jianbing.,Li, Langping.,...&Clague, John J..(2021).The cyclic expansion and contraction characteristics of a loess slope and implications for slope stability.SCIENTIFIC REPORTS,11(1),14.
MLA Lan, Hengxing,et al."The cyclic expansion and contraction characteristics of a loess slope and implications for slope stability".SCIENTIFIC REPORTS 11.1(2021):14.

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来源：地理科学与资源研究所

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