Long-term kinematics and mechanism of a deep-seated slow-moving debris slide near Wudongde hydropower station in Southwest China

doi:10.1007/s11629-017-4473-1

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2018 > Vol15 No.2

	Long-term kinematics and mechanism of a deep-seated slow-moving debris slide near Wudongde hydropower station in Southwest China
	JIANG Shu; WANG Yi-feng; TANG Chuan; LIU Ke
刊名	Journal of Mountain Science
	2018-02
卷号	15 期号:2 页码:364-379
关键词	Kinematics Slow-moving Debris Slide Shear Strength Rainfall Infiltration Viscous Component
ISSN号	1672-6316
DOI	10.1007/s11629-017-4473-1
通讯作者	JIANG Shu
英文摘要	Long-term kinematic research of slow-moving debris slide is rare despite of the widespread global distribution of this kind. This paper presents a study of the kinematics and mechanism of the Jinpingzi debris slide located on the Jinsha river bank in southwest China. This debris slide is known to have a volume of 27×106 m3in active state for at least one century. Field survey and geotechnical investigation were carried out to define the structure of the landslide. The physical and mechanical properties of the landslide materials were obtained by in-situ and laboratory tests. Additionally, surface and subsurface displacements, as well as groundwater level fluctuations, were monitored since 2005. Movement features, especially the response of the landslide movement to rainfall, were analysed. Relationships between resisting forces and driving forces were analysed by using the limit equilibrium method assuming rigid-plastic frictional slip. The results confirmed a viscous component in the long-term continuous movement resulting in the quasi-overconsolidated state of the slip zone with higher strength parameters than some other types of slow-moving landslides. Both surface and subsurface displacements showed an advancing pattern by the straight outwardly inclined (rather than gently or reversely inclined) slip zone, which resulted in low resistance to the entire sliding mass. The average surface displacement rate from 2005 to 2016 was estimated to be 0.19~0.87 mm/d. Basal sliding on the silty clay seam accounted for most of the deformation with different degrees of internal deformation in different parts. Rainfall was the predominant factor affecting the kinematics of Jinpingzi landslide while the role of groundwater level, though positive, was not significant. The response of the groundwater level to rainfall infiltration was not apparent. Unlike some shallow slow-moving earth flows or mudslides, whose behaviors are directly related to the phreatic groundwater level, the mechanism for Jinpingzi landslide kinematics is more likely related to the changing weight of the sliding mass and the downslope seepage pressure in the shallow soil mass resulting from rainfall events.
语种	英语
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/20852]
专题	Journal of Mountain Science _Journal of Mountain Science-2018_Vol15 No.2
推荐引用方式 GB/T 7714	JIANG Shu,WANG Yi-feng,TANG Chuan,et al. Long-term kinematics and mechanism of a deep-seated slow-moving debris slide near Wudongde hydropower station in Southwest China[J]. Journal of Mountain Science,2018,15(2):364-379.
APA	JIANG Shu,WANG Yi-feng,TANG Chuan,&LIU Ke.(2018).Long-term kinematics and mechanism of a deep-seated slow-moving debris slide near Wudongde hydropower station in Southwest China.Journal of Mountain Science,15(2),364-379.
MLA	JIANG Shu,et al."Long-term kinematics and mechanism of a deep-seated slow-moving debris slide near Wudongde hydropower station in Southwest China".Journal of Mountain Science 15.2(2018):364-379.