It is well known that seabed exhibits instable behaviors such as liquefaction by losing its effective stress due to wave actions. This paper describes a study on the countermeasure using permeable column for seabed stability against ocean wave actions.
　The effectiveness of the permeable column is investigated by field test where the permeable columns are installed and the pore pressure responses against wave actions are observed. The accuracy of analytical solution for pore pressure response of seabed with permeable columns is examined by using the field test data. Parameter studies for the permeable column are conducted using the analytical solution.
　It is revealed by the field test that the stability of seabed is enhanced by using the permeable column and that the numerical solution has a sufficient accuracy. Parameter studies have shown some conditions for effective use of the permeable column.