Optimization and verification of 3D continuum-discrete coupled algorithm

When the microscopic mechanism research of large-scale geotechnical engineering is studied, a dual-scale coupled model is usually required. Triangular interface mesh was introduced into the existing three-dimensional dual-scale coupled model to optimize the meshes of a continuum model. The calculation formula for the vertical force on pile group foundation under eccentric vertical load was adopted to transfer the force on the interface wall from a discrete model zone to a continuous model zone, and barycentric interpolation coordinate method was adopted to transfer the node velocity of triangular interface mesh in a continuous model zone to the interface wall in a discrete zone. The centrifuge model test of soil under dynamic compaction was simulated using the optimized three-dimensional dual-scale coupled algorithm, and the numerical results were compared with those of the centrifuge model test and the existing three-dimensional coupled model. The results show that when the triangle interface was introduced, the sizes of the discrete model and the continuous model were both smaller than those of the coupled model with quadrilateral interface. The study in this paper perfects the existing 3D dual-scale coupled model and provides a reference for the 3D dual-scale coupling of other geotechnical engineering.