Abstract: At present, the use of software to carry out three-dimensional numerical simulation of large coal bunker cases rarely reported, the use of three-dimensional parallel computing is not a precedent. Based on an engineering example, by using the three-dimensional parallel finite element calculation program is developed by using elastic-plastic theory and choosing reasonable constitutive models, the numerical simulation for the support scheme of coal bunker in Dong Loutian coal mine is performed. The results show that the upper part of the upper part of the two side walls of the groove bin collapses and the lower part protrudes, and the overall deformation is a sliding trend when the excavation section is completed. The deformation occurs mainly in the direction of gravity, the deformation in the north-south horizontal direction is relatively small, the larger vertical deformation occurs mainly near the side of the slope inward when the backfill section is completed. The maximum deformation of the silo structure occurs at the upper and lower ends of the structure at the east side of the coal bunker, showing outward expansion at the upper end and inward extrusion at the lower end when the excavation backfill is completed. It is feasible to use three-dimensional parallel finite element method to carry out numerical simulation research on the backfilling process of trench excavation. the numerical results obtained from the simulation analysis meet the basic requirements of engineering and theory, and are in approximate agreement with the actual engineering measurement results, which is worthy of further popularization and application.

Key words: Bunker, Finite element method( FEM), Deformation, Numerical simulation