Improved coupling unsteady seepage model of discrete-continuous medium

The paper established the discrete fracture network-equivalent continuous medium coupling model for the mining space, which avoided the shortcomings of the previous seepage models and reflected the structural characteristic and permeable characteristic of the mining space. Finite element formula of non-linear coupling model was deduced and written the corresponding FEM code. At last, the engineering application was taken to prove feasibility and practicality of the coupling model.