Abstract
Principle of gravel compaction pile method is to increase the density of loose sandy ground and to prevent damage of structure due to liquefaction using the gravel piles, which will immediately dissipate the excess water pressure occurred in the sandy ground at the earthquake.
In this report, soil improvement effect of grain material in the gravel pile as a measure against liquefaction was investigated. Tri-axial compression tests using uniform particle size grain material and in-situ testing were conducted. According to those results, it was clarified that both the dilatancy properties of less volume change and high permeability of the material can be considered in the design stage, and also are effective for the economical design of slab foundation structures.
