TY - JOUR
T1 - Precursors of instability in a natural slope due to rainfall
T2 - a full-scale experiment
AU - Askarinejad, Amin
AU - Akca, Devrim
AU - Springman, Sarah M.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - A full-scale landslide-triggering experiment was conducted on a natural sandy slope subjected to an artificial rainfall event, which resulted in mobilisation of 130 m3 of soil mass. Novel slope deformation sensors (SDSs) were applied to monitor the subsurface pre-failure movements and the precursors of the artificially triggered landslide. These fully automated sensors are more flexible than the conventional inclinometers by several orders of magnitude and therefore are able to detect fine movements (< 1 mm) of the soil mass reliably. Data from high-frequency measurements of the external bending work, indicating the transmitted energy from the surrounding soil to these sensors, pore water pressure at various depths, horizontal soil pressure and advanced surface monitoring techniques, contributed to an integrated analysis of the processes that led to triggering of the landslide. Precursors of movements were detected before the failure using the horizontal earth pressure measurements, as well as surface and subsurface movement records. The measurements showed accelerating increases of the horizontal earth pressure in the compression zone of the unstable area and external bending work applied to the slope deformation sensors. These data are compared to the pore water pressure and volumetric water content changes leading to failure.
AB - A full-scale landslide-triggering experiment was conducted on a natural sandy slope subjected to an artificial rainfall event, which resulted in mobilisation of 130 m3 of soil mass. Novel slope deformation sensors (SDSs) were applied to monitor the subsurface pre-failure movements and the precursors of the artificially triggered landslide. These fully automated sensors are more flexible than the conventional inclinometers by several orders of magnitude and therefore are able to detect fine movements (< 1 mm) of the soil mass reliably. Data from high-frequency measurements of the external bending work, indicating the transmitted energy from the surrounding soil to these sensors, pore water pressure at various depths, horizontal soil pressure and advanced surface monitoring techniques, contributed to an integrated analysis of the processes that led to triggering of the landslide. Precursors of movements were detected before the failure using the horizontal earth pressure measurements, as well as surface and subsurface movement records. The measurements showed accelerating increases of the horizontal earth pressure in the compression zone of the unstable area and external bending work applied to the slope deformation sensors. These data are compared to the pore water pressure and volumetric water content changes leading to failure.
KW - Geotechnical physical modelling
KW - Landslide monitoring
KW - Natural hazards
KW - Rainfall
KW - Slope deformation sensors
KW - Slope movements
KW - Slope stability
KW - Unsaturated soils
UR - http://www.scopus.com/inward/record.url?scp=85052752708&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:e8450927-f3e1-4afa-a134-7261ae4e4770
U2 - 10.1007/s10346-018-0994-0
DO - 10.1007/s10346-018-0994-0
M3 - Article
AN - SCOPUS:85052752708
SN - 1612-510X
VL - 15
SP - 1745
EP - 1759
JO - Landslides
JF - Landslides
IS - 9
ER -