Kawamura Y., Ito K., Yamamoto K., Sakakibara T.

In this research, the validity of Soil Densification Applying Gravel Drain System was proved by practicing a small-scale experiment and a distinct element method simulation. Soil Densification Applying Gravel Drain System that is developed by MARUJUN Corporation is one of the effective way of preventing liquefaction. Because of the peculiarity of the motor, it is possible to hold down the cost, scale and the term of construction compared to conventional methods. Effect of compaction can be expected too, from applying pressure when injecting aggregate from the top. The effect of compaction was verified using Surface-wave Method. Surface-wave Method has been applied to both engineering and earth science problems to image the S-wave velocity of the Earth. Surface-wave Method can estimate S-wave velocity models that are extremely valuable in geotechnical work. Therefore, Surface-wave Method has been increasingly used in various civil engineering and environmental investigations. Distinct Element Method (DEM) is suitable for the simulation of deformation behavior of a discontinuous model. It assumes that an analysis object is a set of small elements. By solving an equation of motion of each element, behavior of the analysis object is observed.