Environmental Engineering Reference
In-Depth Information
Figure 4.11.
Elastoplastic model of the boulder-structure system
4.7.2.
Capacity of the various types of structures
The domain of impact energies is generally found to be between the following
values:
v
= 10 to 45 m/s;
m
= 0.5 to 30
t
;
E
= 25 to 30.000kJ.
The velocities observed are practically always located in the indicated range. The
masses can be larger, up to 500
t
in certain cases (for example, the 200 m
3
boulder
observed at Aigueblanche).
Figure 4.12 gives the absorbable energy for various types of structures, by
increasing capacities:
- rigid barriers of metallic pillars and wooden cross beams (25 to 50 kJ);
