高放废物处置库缓冲层热-水-力耦合数值模拟

Numerical Simulation of Thermohydromechanical Coupling for Buffer Layer in High Level Radioactive Waste Disposal Repository

以混合物理论和连续介质力学为基础,建立考虑固相变形、多相流体流动和热传输的非饱和缓冲材料的温度、渗流和应力(THM)耦合数学模型.以多场耦合缓冲材料Mock-up试验台架为几何原型,利用有限元软件COMSOL Multiphysics中的PDE模块进行二次开发,对高水平放射性废物(HLW)处置库近场的THM耦合过程进行数值模拟,可为高放废物处置库的设计提供理论依据.

The coupled thermo-hydro-mechanical(THM)mathematical model of unsaturated buffer materials were established based on the theory of mixtures and continuum mechanics,considering solid phase deformation,multiphase fluid flow,and heat transport.Taking the Mock-up test of multi field coupling buffer material as the geometric prototype,the PDE module in the finite element software COMSOL Multiphysics was used for secondary development.The THM coupling process in the near field of HLW disposal repository was numerically simulated.It provides an important theoretical basis for the design of HLW disposal repository.