Optimization analysis for numerical calculation of UH model

Numerical calculation is an important tool for analyzing geotechnical engineering problems, and the accurate and efficient application of the unified hardening (UH) model in numerical calculation of geotechnical engineering is of great value. The superiority of the UH model in theoretical inheritance, loading and unloading judgment, and equivalent concept application was studied. The graphical user interface (GUI) components and user material (UMAT) subroutine for the UH model were developed, and the UH model was effectively embedded in the finite element software. The convergence of numerical calculation was improved through the application of the symmetry method of tangent stiffness matrix and the improved formula of low-pressure stress transformation. The UH model was applied to simulate the foundation load plate test, and the calculated load-settlement curve was found to be close to the test data, which demonstrated the reliability of the UH model in foundation deformation calculation. The research results have effectively developed the numerical calculation capabilities of the UH model and improved the optimization of the calculation methods, which holds important value for solving complex geotechnical engineering problems.