The discussion about definiting upper boundary condition in numerical simulation model of mining engineering

Abstract：By using UDEC numerical simulation computation, the determination of simplified model's upper boundary condition when simulating strata movement was studied.The results show that, it have no remarkable influence on the breakage length, the distribution of vertical stress and the displacement of main roof.The rock strata deadweight above main key stratum was simplified to uniform load and loaded on model's upper bounary when exists main key stratum in model.The rock strata deadweight above water flowing fractured zone was simplified to uniform load and loaded on model's upper bounary when doesn't exist main key stratum.Therefore, it may load the rock strata deadweight above main key stratum or water flowing fractured zone on the model's upper boundary in model.

Keyword：mining engineering;numerical simulation;model;boundary;