Abstract: In the calculation of mining subsidence， empirical methods are usually used to determine the displacement angle of strata. However， in some newly-built mining areas in western China， due to the lack of accumulation of surface observation data or the lack of adjacent coal fields as an analogy， the application of empirical methods has obvious defects. It is difficult to rationally determine the displacement angle of strata . As long as the numerical simulation method uses the drilling data of the previous geological exploration to obtain the displacement angle， and does not need the observation data of the surface movement deformation， it can be used as an effective method to solve the problem. However， existing research is generally based on modeling results of stratigraphic simplification， which is bound to cause certain errors. In order to study the reliability of the rock movement angle based on the numerical simulation of the complete borehole column results， the FLAC3D model was established according to the full column results and simplified results. After comparative analysis， it is concluded that the calculation results of the FLAC3D model based on the full column results are in good agreement with the measured angular values in the later part of the mining area. It is pointed out that it is more reasonable and accurate to obtain the rock movement angle based on the complete column modeling.

Key words: Drilling hole, Stratigraphic full column, Numerical simulation, FLAC3D, Strata displacement angle