The multi-field coupling theory of geotechnical media is a product of the intersection and permeation of disciplines such as geotechnical mechanics, seepage mechanics, heat transfer, and engineering technology. The research on this problem initially began in the water conservancy and hydropower industries, and now it has spread to fields such as geothermal energy, natural gas hydrate extraction, and nuclear waste storage. Geotechnical media are products naturally generated over a long period of geological time, and are porous media composed of different mineral combinations. It is influenced by various factors in nature, almost all of which interact in the form of fields and constantly change with the changes in time and space. The mechanical, physical, and chemical properties of rock and soil comprehensively reflect the deformation, failure, and interaction between the three-phase components of solid, liquid, and gas under external stress, seepage field, temperature field, chemical field, and other fields, namely the coupling effect. This coupling effect is often unidirectional or bidirectional and produces irreversible effects, such as fluid velocity and pressure, stress and deformation, temperature gradients, and processes between fluid solid chemical reactions. As shown in Fig. 1.1, the arrows between the fields indicate the coupling relationship, with their direction pointing toward the direction of action.