Abstract: The forecasting method for water inflow was researched.The application feasibility of discrete element method in forecasting water inflow was analyzed with the discrete element method to propose the specific program to predict the water inflow.Three-dimensional discrete element method was adopted to predict the water inflow in practical engineering with the aid of 3DEC secondary development program.The research results showed that the accurate dynamic prediction of water inflow after excavation tunnel was obtained with 3DEC based on the seepage field and the stress field coupling theory.This high-efficient and reasonable prediction method for water inflow provides a reference for similar engineering.

Key words: Metal mine, Water inflow, Three-dimensional discrete element method, 3DEC