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Deformation of landslide revealed by long-term surficial monitoring: A case study of slow movement of a dip slope in northern Taiwan.

Deformation of landslide revealed by long-term surficial monitoring: A case study of slow movement of a dip slope in northern Taiwan.

Authors :
Tseng, Chia-Han
Chan, Yu-Chang
Jeng, Ching-Jiang
Rau, Ruey-Juin
Hsieh, Yu-Chung
Source :
Engineering Geology. Apr2021, Vol. 284, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

A natural hillslope developing into a landslide shows ground cracks and topographic deformation. Geomorphological and subsurface investigations using appropriate methodology are essential to understand the failure mechanisms and stability of a hillslope. Huafan University campus located on a dip slope in northern Taiwan is facing a potential landslide hazard. Slope movement was detected through the development of ground cracks and persistent deformation of campus buildings and facilities. To monitor the sliding behavior of the dip slope, a nail network consisting of 144 ground monitoring points was set in 2001, and its coordinates were measured using conventional traverse surveying twice a year until 2017. The 17-year surficial surveying results were presented as a time series of displacements with constraints of geometry and distribution of ground cracks and underground observations. The long-term surveying results reveal multiple potential sliding blocks within the Huafan University campus. A model of landslide movement with a listric sliding surface is proposed. Additionally, from the velocity field derived from the monitoring points, the horizontal strain rates of the slope are estimated. The pattern of strain rates indicates that a plausible fault passing through the campus may have affected the movement of the dip slope. The long-term surface monitoring of a potential landslide slope in this study provides a reliable and economical way to understand the mechanism of movement behavior of the slope and evaluate slope stability. • 17-year surficial monitoring distinguishes movement behavior of different parts of dip-slope landslides. • A model of movement process of landslides having listric sliding surface(s) is proposed to reveal intermittent movements. • A strain pattern obtained of the slope surface evidences a tectonic fault passing through the landslide block. • Economic and reliable study procedures are applicable to unstable slopes for research and disaster prevention. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00137952
Volume :
284
Database :
Academic Search Index
Journal :
Engineering Geology
Publication Type :
Academic Journal
Accession number :
149569591
Full Text :
https://doi.org/10.1016/j.enggeo.2021.106020