A large-scale obliquely inclined bedding rockslide triggered by heavy rainstorm on the 8th of July 2020 in Shiban Village, Guizhou, China

A large-scale obliquely inclined bedding rockslide, activated by a heavy rainstorm, occurred on July 8, 2020, at 7:05 (UTC + 8) in Shiban Village, Songtao Miao Autonomous County, Guizhou Province, China. The loss of life in this event was greatly reduced owing to the local warning system for rainsto...

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Bibliographic Details
Published in:Landslides 2022-05, Vol.19 (5), p.1119-1130
Main Authors: Yu, Haibing, Li, Changdong, Zhou, Jia-Qing, Gu, Xiaoping, Duan, Ying, Liao, Liufeng, Chen, Wenqiang, Zhu, Yinbin, Long, Jingjing
Format: Article
Language:English
Subjects:
Aerial photography
Agriculture
Casualties
Civil Engineering
Earth and Environmental Science
Earth Sciences
Field investigations
Field tests
Geography
Geological hazards
Geology
Geomorphology
Groundwater
Groundwater recharge
Heavy rainfall
Hydrologic data
Hydrology
Hydrostatic pressure
Imagery
Inflow
Joints (timber)
Laboratory tests
Landforms
Landslide warnings
Landslides
Natural Hazards
Photography
Pore pressure
Pore water
Pore water pressure
Rain
Rain water
Rainfall
Rainfall data
Rainstorms
Recent Landslides
Rock masses
Rocks
Rockslides
Satellite imagery
Sliding
Slopes
Slumping
Spaceborne remote sensing
Statistical methods
Statistical tests
Unmanned aerial vehicles
Uplift
Uplift pressure
Warning systems
Water levels
Water pressure
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Summary:A large-scale obliquely inclined bedding rockslide, activated by a heavy rainstorm, occurred on July 8, 2020, at 7:05 (UTC + 8) in Shiban Village, Songtao Miao Autonomous County, Guizhou Province, China. The loss of life in this event was greatly reduced owing to the local warning system for rainstorm-induced geohazards. To understand the failure characteristics, triggering factors, the genetic mechanism of the landslide, the geomorphological features, geological characteristics, hydrological conditions, and rainfall characteristics were systematically studied by a synthetic approach including field investigations, satellite imagery, unmanned aerial vehicle (UAV) photography, laboratory tests, and rainfall data statistics. The results indicated that the interface between the soft and hard rock, the well-developed joints, and the free face in front of the slope constituted the boundaries of this landslide. The concave topography at the back and southern edge of the landslide, the bare ground, and the cataclastic structure of the rock mass provided favorable conditions for the collection or infiltration of rainwater. The concentrated rainstorm was the direct trigger for the landslide, which led to a rapid inflow and retention of rainfall in the landslide through favorable landform and geological conditions. The groundwater recharge that cannot be drained in time caused the mechanical deterioration of rock mass and induced a rapid increase in pore water pressure in the landslide. Moreover, the water level of the Ganlong River at the toe of the slope also rose rapidly, and the uplift pressure in front of the slope increased accordingly. Under the combined action of these adverse factors, the overall anti-sliding force of the slope was less than the sliding force, finally resulting in the landslide. Remarkably, the local warning system for rainstorm-induced geohazards successfully forecasted the landslide, but the shortcoming is that the forecast time in advance is short. Nevertheless, the prediction has significantly reduced human casualties and provided valuable experience for the prediction of this type of landslide.
ISSN:1612-510X
1612-5118
DOI:10.1007/s10346-022-01850-6