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Hydraulic Model Experiments on the Stability against Wave Actions of a Breakwater using the Suction Foundation

Publication year

Port and Airport Research Institute　Technical Note　1027　2002.09

Author(s)

Kenichiro SHIMOSAKO,Masahide NAKAGAWA,Toyokazu KURODA,Ryuichi FUJIWARA

Department
/Divison

Marine Environment and Engineering Department Maritime Structures Division

Executive Summary

The breakwater using the suction foundation has several advantages over conventional composite breakwater, i.e., it has high stability against wave actions, can be constructed without rubble mound foundation, and also need not special construction machine. Therefore, the construction period and cost will be reduced compared with composite breakwater.
　A series of small scale and large scale hydraulic model experiments were conducted to investigate the characteristics of the breakwater using the suction foundation, and the calculation method of wave forces acting on the suction foundation was proposed. Major conclusions are as follows:
1) Wave pressure on the caisson can be calculated by Goda's pressure formula.
2) Wave pressure acting on the offshore side of suction foundation can by theol.etically obtained supposing that the pressure is exponentially reduced in seabed.
3) Even in the clay bed, wave pressure on the suction foundation should be considered except the uplift force.
4) Wave pressure On the suction foundation does not necessarily become maximum value when the pressure on the caisson is maximum, however, the time-lag of wave forces between the caisson and the suction foundation should not be considered in the design.

PDF File

/en/pdf/en/no1027.pdf