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Full-scale field testing on shallow landslide barrier
Overview of research and development
Corinna Wendeler
Geobrugg AG
Overview
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Hazard shallow landslide/rockfall
1:1 Field tests landslides
Rockfall barrier tests
Load case combination rockfall and
shallow landslides
Shallow landslides
Shallow landslides
• Hazard
Shallow landslides
Shallow landslides /
hillslope debris flows
 up to 2 m failure depth or
 up to 200 m3 starting volume
Risk factors
 Rainfall (amount, intensity)
 Soil permeability
 Convex topography,
channelized landscape
 Macro porosity
 Bed rock
 Vegetation
Rockfall
Pressure Loads and dynamic punctural loads
Velocity
Avalanche
Rockfall
Tree hit
Murgang/
Snow slide
Shallow landslide
s
Punctural load
Snow pressure
Area
Load
Certified systems
Tested systems
Content
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Hazard shallow landslide/rockfall
1:1 Field tests landslides
Rockfall barrier tests
Load case combination rockfall and
shallow landslides
Boundaries for full scale testing
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Volume
Slope inclination
Flow velocity
Material
composition
• Material
mobilization
 20 - 500 m3
 30 – 50°
 3 – 10 m/s
 Repeatable mixture of gravel, soil & water
 Repeatable, spontaneous release
Repeatability?
Release mechanism
Release
mechanism
Test site Veltheim
Measurement facilities
41 m
Release mechanism
27 m
Height sensors
15 m
11 m
Force plate and pore water pressure sensors
Obstacle with impact pressure sensor
Test barrier with force cells
Flow process – material mixture
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Material needs to be good mixed
Earth and clay is important to get the flow viscous
Multi surge tests
Results
Flow depth
 h1,2 = h1,2(x1,2,t)
 First / consecutive releases
 Deposit 0.05 m < hd (x2) < 0.2 m
Results
Load forces
 Fus,ls,l,31,32,42 = Fus,ls,l,31,32,42(x4,t)
 First / consecutive releases
 Static / dynamic load
Numerical Modeling
Overview
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Hazard shallow landslide/rockfall
1:1 Field tests landslides
Rockfall tests
Load case combination rockfall and
shallow landslides
Rockfall Tests on SL Barriers
Rockfall Tests on SL Barriers
500 kJ could be caught successfully!
Overview
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Hazard shallow landslide/rockfall
1:1 Field tests landslides
Rockfall tests
Load case combination rockfall and
shallow landslides
Load case combination
Important:
Rockfall barriers are only effective
retaining shallow landslides with
special adaptations.
Area load of flow must be considered
Design for static filling
Retention capacity must be checked
Quelle: Le Matin Online
Load case combination
Shallow landslide impact [kN/m2]
Rockfall hit [kJ]
First successfully designed project - Austria
Rockfall net with rockavalanche
Thanks for your attention