Abstract: Reactive transport simulation in fractured media is a prominent and challenging research area in the fields of geosciences and environmental engineering. Traditional equivalent porous media models and discrete fracture networks have certain limitations in accurately characterizing groundwater flow and solute transport processes within complex fracture networks.
This paper presents the development of FracRTM, a numerical simulation software for groundwater flow and reactive transport in the fractured media. FracRTM, based on Discrete Fracture Network (DFN) modeling, employs the Upscaled Discrete Fracture Matrix Model (UDFM) to construct continuum meshes and calculate equivalent permeability and porosity. The software integrates open-source reactive transport simulation programs to model the physical and chemical processes of groundwater flow, solute transport, and chemical reactions within fractured-matrix systems. This paper describes the overall design and functional modules of FracRTM , followed by a numerical simulation case study of acid mine drainage migration, which is used to validate the software’s effectiveness.

Key words: fracture flow, reactive transport model, numerical model, software development