Mechanics-based evaluation of liquefaction hazard with integrated FEM-DEM in multiscale
A hybrid numerical method coupling FEM and DEM is developed to simulate the liquefaction phenomenon in soil.
The boundary value problem of cyclic-loaded soil will be solved by the FEM, in which the constitutive relation will be derived from the the DEM solution of a granular assembly.
Given in-situ sampling data (e.g., seismic loading, water table, granular size distribution, porosity, etc.), the developed hybrid model is able to calculated the potential of “triggering” of liquefaction and the post-liquefaction deformations of the soil specimen.
With the calculated deformation of specimen, the in-situ deformation of the ground surface should be able to known integration over the depth of soil layers.
Integrated with random fields:
Sampling and calculate deformations of the ground surface at controlling sites within a large region. Then use multiscale random field models to map the calculated deformations over the whole region.