Abstract: Given that it is difficult to construct a real-time dynamic coal seam in a virtual fully mechanized coal mining face， a method of constructing the 3-D geological model based on the walking trajectory of the shearer is proposed. The initial 3-D geological model and dynamic 3-D geological model are established， and the trajectory curve of the target coal seam is extracted， which provides the target cutting path for the shearer. Based on the actual cutting situation and future development trend of the shearer， three kinds of shearer cutting schemes are put forward， which are memory cutting， memory cutting with manual intervention and autonomous cutting. The real virtual fully mechanized coal mining face is established， the actual coal seam morphology of three schemes is constructed， and the simulation contrast experiment is carried out. The results show that the overall average error of the actual coal seam constructed by the shearer’s autonomous cutting scheme is 15.73mm， which can achieve smaller rock cutting amount and higher mining efficiency.

Key words: 3-D geological model; virtual fully mechanized coal mining face; cutting plan; digital twin; Unity3d