Theory And Application Of Thermo-Electro-Mechanical-Diffusion Coupling In Porous Media

Porous media are called porous media.It exists widely in nature and human life.Because of the existence of irregular pores and the existence of liquid or gas in pores,they will flow in porous media,which is the property of porous media.Porous media are ubiquitous in real life,such as soil,biological tissue,and concrete.Because of the complexity of the micro structure of porous media,porous media has a multi field coupling characteristic,such as diffusion force coupling and thermo diffusion coupling.At the same time,the mechanical processes of porous media are often accompanied by other complicated physical processes,chemical processes and biological processes.These processes are interacting with each other and restricting each other.In order to reveal the mechanism of multi field coupling in porous media,the coupling behaviors of thermo-electro-mechanical-diffusion are investigated for porous media in this dissertation.The main research work of this paper is as follows:(1)In this paper,the basic equations,boundary conditions and the double constitutive relations of the thermal electric force diffusion multi field coupling dynamics are clarified.This paper apply the law of function transformation and energy conservation principle.The Hamilton principle and generalized Hamilton principle of the thermo-electro-mechanicaldiffusion coupling dynamics are established.The correctness of the variational model is verified by derivation of its standing condition.Finally,the finite element formula of the thermal-electric-mechanical-diffusion coupling dynamics of porous media is given.(2)Based on the finite element formula of the thermal-electric-mechanical-diffusion coupling dynamics,the finite element formula of diffusion-mechanical,diffusion-heat and diffusion-mechanical-heat is simplified.The numerical simulation of the concrete material is carried out.By comparing with the test results,the model is proved to be reasonable and effective.In this paper,the model established in this paper and the finite element method are also suitable for the multifield coupling analysis of other porous media.