Study on Stress Distribution and Transfer Law of Simultaneous Mining in the Ultra-Close Thin Coal Seams

摘要

When ultra-close distance thin coal seams were simultaneously mined, causing the choice of coal mining method was more difficult because the analysis was not enough profound about the distribution of the abutment pressure and interaction mechanism. Using the FLAC3D established numerical mechanics model, researched ultra-close distance thin coal seams with the simultaneous coal mining in the process change of the displacement field, the plastic area and the stress field, and exposed its stress distribution and transfer law, through the industrial-site tests, has been obtained the good technical economic effect. The result indicated that ultra-close distance thin coal seams with the simultaneous coal mining were solved by the method of establishment numerical mechanics model, compared the traditional method to be more effective and precise. It is worth further discussing and the application when ultra-close distance thin coal seams with the simultaneous coal mining were solved by numerical simulation.