气候变化领域集成服务门户(CCPortal): Numerical analysis of the impacts of rainfall on permafrost-related slope stability on the Qinghai-Tibet Plateau

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DOI	10.1016/j.ejrh.2023.101439
	Numerical analysis of the impacts of rainfall on permafrost-related slope stability on the Qinghai-Tibet Plateau
	Hao, Junming; Jia, Peiqian; Wu, Tonghua; Li, Wangping; Chen, Jie; Yang, Xiaohui; Wu, Xiaodong; Hu, Guojie; Cui, Kai; Zhang, Mingli
发表日期	2023
EISSN	2214-5818
卷号	47
英文摘要	Study region: This study interrogates a landslide in ice-rich permafrost region in the Eastern Qinghai-Tibet Plateau, China. Study focus: Climate warming has increased the frequency and intensity of rainfall events, changing hydrothermal processes and the soil mechanical properties, thus affecting slope stability in permafrost region. The purpose of this paper is to elucidate the variations in soil volumetric water content (VWC) which may influence the mechanical properties of unstable slopes in ice-rich permafrost region under different rainfall conditions. New hydrological insights for the region: This paper integrates the rainfall infiltration boundary conditions and Mohr-Coulomb criterion into a thermo-hydro-mechanical (THM) model and analyzes a landslide case in the permafrost regions. The results show that the THM model can effectively account for the impacts of VWC variation under different rainfall conditions. The influence of rainfall on the VWC diminishes as depth increases, with a more pronounced effect observed at depths less than 1 m. At depths exceeding 1 m, the impact is relatively minor. Under the condition of low-intensity, long-duration rainfall, with accumulated precipitation exceeding 60 mm, the cohesion and internal friction angle decrease to 4.2kPa and 8.1 degrees, respectively, with a deep-layer integral slippage. In contrast, under the condition of high-intensity, short-term rainfall, the accumulated rainfall exceeds 75 mm and the internal friction angle decreases from 39 degrees to 26 degrees, with shallow-layer slippage. The results add on to our understanding engineering problems and periglacial geomorphic processes under the influence of climate warming.
关键词	Slope stability Coupled thermo -hydro -mechanical model Numerical simulation Permafrost Eastern Qinghai -Tibet Plateau
英文关键词	INDUCED LANDSLIDES; WATER-CONTENT; SOIL SLOPES; THAW; THRESHOLDS; STRENGTH; REGIONS; INFILTRATION; INSTABILITY; EMBANKMENT
WOS研究方向	Water Resources
WOS记录号	WOS:001044618900001
来源期刊	JOURNAL OF HYDROLOGY-REGIONAL STUDIES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282734
作者单位	Lanzhou University of Technology; Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Hao, Junming,Jia, Peiqian,Wu, Tonghua,et al. Numerical analysis of the impacts of rainfall on permafrost-related slope stability on the Qinghai-Tibet Plateau[J],2023,47.
APA	Hao, Junming.,Jia, Peiqian.,Wu, Tonghua.,Li, Wangping.,Chen, Jie.,...&Zhang, Mingli.(2023).Numerical analysis of the impacts of rainfall on permafrost-related slope stability on the Qinghai-Tibet Plateau.JOURNAL OF HYDROLOGY-REGIONAL STUDIES,47.
MLA	Hao, Junming,et al."Numerical analysis of the impacts of rainfall on permafrost-related slope stability on the Qinghai-Tibet Plateau".JOURNAL OF HYDROLOGY-REGIONAL STUDIES 47(2023).