Abstract
A numerical study is conducted to simulate liquefaction using a microscopic fluid coupling scheme with the two-dimensional Discrete Element Method. The scheme creates triangular fluid cells, which represent void spaces, in a particle assembly by connecting each particle centroid between the nearest three particles. The scheme solves pore water pressure in each void space and fluid flow across them by considering compressibility of fluid caused by particle movement. On the other hand, pore water pressure is applied to particles involved in each fluid cell as a form of body force in proportional to occupied area of each particle in void space. Numerical simulations, in which two types of particle assemblies with different initial porosity are excited by the same acceleration condition as that in a centrifuge model experiment. In the centrifuge experiment, the sand assemblies in a rectangular box is excited by sinusoidal acceleration under loading centrifugal force, which is thirty times larger than the gravity acceleration. The numerical results are compared with those of the experiment. As a result, it is clarified that the scheme represents transient of localized pore water pressure, effective stress and acceleration under dynamic acceleration in saturated particle assemblies with different initial porosity, and is an effective to analyze liquefaction.
