Vibrations due to excavation 265
0.3
Surface
- coal and mine blasting
- I
f= principal frequency
* 0 Quarry blasting
III-III
7 Construction blasting
eZa Localized excitation
0.2
0.1
0
E
2
50 5 IO 15 20
Natural frequency (Hz)
3
2
0.2
0.1
5 10 15 20
Damping (% of critical)
0
Principal frequency (Hz)
Figure 15.25 (a) Examples of principal frequencies induced by blasting (from
Siskind et al., 1980). (b) Examples of fundamental frequencies for low-rise residential
structures (from Dowding, 1985).
Frequency (Hz)
Figure 15.26 Example ground motion and structure response spectra (from
Dowding, 1985).