Geoscience Reference
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Reduced noise.fig
Materials for compacted piles:
Conventional compaction
Sand
Intensity of
noise (dB)
Gravel
Recycled waste
100
95
90
85
80
75
70
65
60
0
20
40
60
80
100
Distance from source (m)
Fig. 15.2. Intensityof noise during static construction of sand compaction piles
(by Fudo-Tetra Corporation)
Reduced vibraton.fig
Materials for compacted piles:
Conventional compaction
Intensity of
vibration
(dB)
Sand
Gravel
Recycled waste
90
80
70
60
50
40
30
0
20
40
60
80
100
Distance from source (m)
Fig. 15.3. Intensity of ground vibration during staticconstruction of sandcompaction
piles (by Fudo-Tetra Corporation)
reclaimedlandliquefied(Figure15.4).Itisalreadyknownthatblastingisabletoincrease
SPT-N of sandy ground significantly (Figure15.5). It seems to the author, however, that
more efforts have to be made to improve its efficiency so that sand density may be suf-
ficient to survive a very strong design earthquake. The very strong design earthquake
