Extension of 3-D coupled DDA-SPH method for dynamic analysis of soil-structure interaction problems

Soil-structure interaction problems are an important issue in the research field of geotech-nical engineering. Understanding and modeling the soil-structure interaction problems is thus critical. Such interaction problems involve the mechanical behaviors of both soil and structure as well as their complex interaction. Discontinuous deformation method (DDA) is appropriate for modeling mechanical behavior of structure, while smoothed particle hy-drodynamics (SPH) offers a feasible technique for describing the mechanical behavior of soil material. A coupled DDA-SPH method can integrate the advantages of both DDA and SPH. For three-dimensional (3-D) dynamic analysis of the soil-structure interaction prob-lems, the original 3-D coupled DDA-SPH method must be extended, which is the primary purpose of this paper. In the extended 3-D coupled DDA-SPH method, an elastic-plastic soil constitutive model associated with the Drucker-Prager yield criterion is implemented. The interaction between soil and structure is realized through a newly proposed coupling scheme based on a penalty method using the Mohr-Coulomb failure criterion. Further-more, the extended 3-D coupled DDA-SPH method is validated through the investigation of four experiments. The simulation results suggest that the extended 3-D coupled DDA-SPH method can accurately simulate the large deformations and post-failure behavior of soil-structure interaction problems. (c) 2022 Elsevier Inc. All rights reserved.

Automated summary

Soil-structure interaction problems are crucial in geotechnical engineering research. This paper presents an extended 3-D coupled DDA-SPH method for accurately simulating the large deformations and post-failure behavior of soil-structure interaction problems. The method combines the advantages of the discontinuous deformation method (DDA) for modeling the mechanical behavior of structures and the smoothed particle hydrodynamics (SPH) technique for describing the mechanical behavior of soil materials.