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Abstract In order to apply two-scale coupled approach for solid phase to saturated soil，a scheme coupling fluid and discrete-continuous solids is established. For fluid-phase，based on the ALE(arbitrary Lagrangian Eulerian) description which is convenient to control moving boundaries and meshes，unified fluid dynamic equations are established. Besides，the fluid-solid interaction terms which exhibit unified forms and pick up fluid-solid interaction forces in the discrete and continuous domains respectively，are incorporated in these fluid equations. Then based on the Characteristic-based split algorithm，the split of the developed fluid dynamic equations is performed to obtain the proper forms suitable for a standard Galerkin-type discretization procedure. Finally，this proposed method is applied to simulation of underground structure buried in liquefiable soil under seismic excitation，which demonstrates that this scheme incorporates discrete-continuous solids and unified fluid dynamic equations can effectively depict non-continuous contacts between particles and the underground structure，decrease the number of particles for simulation，and take into account moving boundaries for fluid-phase caused by underground structure as well.
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2015, Vol. 34 
