Shallow Landslide Full-scale Experiments In
Combination With Testing Of A Flexible Barrier
Author(s)
L. Bugnion & C. Wendeler
Abstract
Open shallow landslides occur regularly in a wide range of natural terrains.
Generally, they are difficult to predict and result in damages to properties and
disruption of transportation systems.
In order to improve the knowledge about the physical process itself and to
develop new protection measures, full-scale experiments were conducted in
Veltheim, Switzerland. Material was released down a test slope into a flexible
barrier. The flow, as well as the impact into the barrier, was monitored using
various measurement techniques. Laser devices recording flow heights and a
special force plate measuring normal and shear basal forces, as well as load cells
for impact pressures, were installed along the test slope. In addition, load cells
were built in the support ropes and retaining cables of the barrier to provide data
for detailed back-calculation of load distribution during impact. A release
mechanism simulating the sudden failure of the slope was designed such that
about 60 m3 of mixed earth and gravel saturated with water can be released in an
instant.
The analysis of cable forces coupled with impact pressures and velocity
measurements during a testing series now allows one to develop a load model for
the barrier design. The first numerical simulations of the impacted barrier lead to
structural improvements of new protection measures. It appears that special
adaptations to the system, such as smaller mesh sizes, a special ground-barrier
interface compared to normal rock-fall barriers and channelized debris flow
barriers, are necessary in order to improve the retention capacity of shallow
landslide barriers.
Keywords
shallow landslide, basal forces, impact pressure, protection barrier
Related Book
Other papers in this volume
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