Abstract: In this paper, to study the creep properties of red sandstone, the uniaxial compressive creep test was carried out. Based on the test results, a non-linear visco-elastic-plastic creep model was established, and the parameters of the model were identified by using the nonlinear optimization algorithm of BFGS. The results show that red sandstone has obvious creep characteristics, and the model can better reflect the creep behaviors of instantaneous loading strain, decay creep, steady creep and accelerating creep, etc. Finally, the non-linear visco-elastic-plastic creep model was fruther developed by using FLAC3D simulation software, and the uniaxial creep numerical simulation of red sandstone was carried out. The creep curves of numerical simulation and experimental results were comparative analyzed, and the practicability of non-linear visco-elastic-plastic creep model was verified.

Key words: red sandstone, creep, creep model, numerical simulation