Simulation Analysis of Roadway Backfilling Mining Under Highway Based on FlAC^3D

According to the coal seam occurrence conditions of planning mining area under highway in Gonggeyingzi Coal Mine, the mining technology of paste-like roadway backfilling was determined, and FLAC^3D numerical simulation simplified model is established and applied. The improved Wilson pillar design formula to is used to calculate the limit load of the theoretical value that the coal pillar can bear, and comparative analysis of the theoretical value and the vertical stress of remaining coal pillar is made, it verify the stability of different remaining coal pillar widths and determine the feasibility of different mining schemes.