Study on Seismic Countermeasures by Steel Pile Diaphragm Wall in Coastal Levee

抄録

After the 2011 off the Pacific coast of Tohoku Earthquake, for existing coastal levees, performance-based seismic designs have been carried out to counter this level II earthquake with a Tsunami, and earthquake resistance measures are being implemented in preparation for The Nankai Trough earthquake which is expected to occur at 70% probability in the next 30 years. In this research, as earthquake countermeasures for the coastal levee against liquefaction of the foundation ground during the earthquake by the press-in type steel pile, setting of the required performance at the time of earthquake, examination of performance-based seismic design and countermeasure construction study were carried out. First, we estimated the extent of damage by the numerical analysis method that the levees suffered with inertia force and ground liquefaction accompanying the earthquake, then we found out the necessity for earthquake resistance measures with the levees according to the performance requirements. In this paper, we mainly describe difference in calculated behavior of the levee due to analytical modeling methods about components of the coastal levee such as sands embankment, wave-dissipating block and concrete revetment. In addition, we show effects of press-in type steel pile as earthquake countermeasures by the numerical analysis method.