Geoscience Reference
In-Depth Information
Fig. 15.4. Liquefaction induced bysubsoil blasting inTokachi Harbor
SPT-N
0
0
10
20
30
Data by
Sato Kogyo
Company
5
10
15
20
Prior to blasting
After blasting
25
BlastSPT-N.fig
Fig. 15.5. Increase ofSPT-N by blasting (data by Sato Kogyo Inc.)
means the one which may occur once every hundreds of years. A key to improve the
efficiency of blasting seems tolie in the stress-induced anisotropy of sand fabric.
Arthur et al. (1977) conducted repeated loading of principal stress, while changing its
orientation. It was thereby shown that the greater volume change (dilatancy) is produced
