Abstract
Abstract This paper presents a boundary element method for modelling contaminant transport of a contaminant species in porous media which consists of both fractured and non-fractured material. In the fractured material, blocks of solid matrix comprising the parent soil material are assumed to be separated by discontinuities in the form of fissures, fractures or joints. The method developed in this paper utilises a double porosity model to deal with contaminant transport in the presence of the discontinuities and solid blocks. The underlying assumption of a double porosity model is that the solid matrix blocks, said to have the primary porosity, constitute one continuum while the network of discontinuities, the secondary porosity, form the other continuum. Flux transfer between the two interacting continua is represented by a source/sink term in the governing equation. When there are no discontinuities, the material reduces to a single continuum with one porosity and so the formulation is able to deal with deposits which consist of both fissured and non-fissured material. This approach is used to develop a boundary element technique which can enable a wide range of problems of practical interest to be analysed.
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