Method for simulating seismic oscillation of sedimentary basin in 3D saturated space

Abstract

The invention provides a method for simulating seismic oscillation of a sedimentary basin in a 3D saturated space. The method, based on the indirect boundary element method, derives a full-space saturated inclined plane disc load Green's function, and addresses the problem of solving boundary singularity. The method comprises the following steps: simulating solid-liquid dynamic coupling effects, pore pressure and flow changing rules for a saturated two-phase model; establishing a 3D saturated area model, based on a Biot saturated multi-media theory, deriving a saturated Green's function, based on boundary conditions, establishing an equation for solution, finally conducting frequency-time domain seismic response simulation analysis so as to predict future seismic oscillation. According to the invention, the method provides an efficient algorithm and a practical application for solving oscillation of saturated inhomogeneous medium engineering, provides theoretical basis for seismic regionalization and structure anti-seismic fortification in coastal complex saturated areas, and brings explicit economic benefits for simulating actual complex engineering.

Description

technical field [0001] The invention relates to the field of earthquake engineering and engineering wave calculation, in particular to a method for simulating ground motion of a sedimentation site in a three-dimensional saturated half-space based on an indirect boundary element method. Background technique [0002] Seismic wave scattering has always been a research hotspot in many disciplines such as earthquake engineering, seismology, and geophysics. Theoretical solutions to seismic wave problems can be divided into analytical methods and numerical methods, among which numerical methods include domain discrete finite element method, finite difference method, discrete wavenumber method and boundary discrete boundary element method. Compared with the domain discrete method, the boundary element method (BEM) has the advantages of high precision, reduced problem solving dimension, and easy handling of high gradient stress changes. It overcomes the problem of high-frequency dis...

AI Technical Summary

Problems solved by technology

[0004] In view of the complexity of the research problem, there are relatively few solutions to the scattering of elastic waves by local sites in a saturated half-space, and there are only a few analytical solutions for the scattering results of elastic waves by three-dimensional saturated local sites

Due to the limitations of the analytical method, the analytical method will not be able to accurately solve the problem of elastic wave scattering for non-uniform or complex 3D sites in actual engineering.

Images