The influence of Particle Vibration on Water Pressure in Fixed Constraining Boundaries

The increase of pore water pressure is the critical condition of liquefaction. Though there are theories and inference for the reason why the pore water pressure increases during vibration with experiment to prove it, it is difficult to observe or measure the immediate increase of pore water pressure. A vibration model with fixed constraining boundaries is proposed in this study to discuss the reason of increasing pressure. The fluid is solved by Lattice Boltzmann Method and the behavior of particles is solved by Discrete Element Method. The two phases coupling boundary is defined by Direct-forcing Immersed Boundary-LBM in Volume Fraction Function. The result shows that the increasing of pressure is caused by the drainage from the gathering particles during vibration. Also, constraining the particles from upward moving will dispel the difference between behavior of particles with depth. The interaction between particles and water pressure can be observed in the model.