Numerical Simulation of Triaxial Compression Experiment of Rock Mass Under Thermal-Fluid-Solid Coupling

Abstract

To explore the relationship between permeability characteristics of rock mass and stress field and temperature field, the mechanical behavior law of rock mass under coupling conditions is further obtained. Under the coupling conditions of temperature field, seepage field and stress field, the numerical simulation of triaxial compression tests of rock mass with different confining pressure gradients and Darcy permeability coefficients is carried out. This paper shows that the confining pressure chamber is one of the factors that influence the permeability of rock mass. Under the same conditions of other fields, the larger the confining pressure, the lower the permeability of rock mass. The stress field acting on the rock mass has obvious influence on the seepage field flowing through the rock mass. The influence of seepage field through rock mass on temperature field inside rock mass is dominant. The effect of stress field acting on rock mass on the temperature field of rock mass distribution is not very significant. The triaxial compression test simulation of rock mass under multi-field coupling condition shows that the end effect is remarkable, the stress distribution at the edge is concentrated, and the stress distribution of rock mass is symmetrical.

Keywords

• temperature field
• seepage field
• stress field
• multi-field coupling
• numerical simulation
• permeability characteristics of rock mass