Numerical analysis of thick coal seam small pillar along gob roadway and its application

Mining technology gob key to the success depends on a stable overlying strata gob of time and location. Mining stope surrounding rock stress redistribution exercise-induced dynamic stresses acting on the rock pit and make state disaster is the root cause of mine disaster occurred. Layered thick seam fully mechanized roadway layout (including internal fault, external fault and vertical), reasonably determine the coal pillar size, roadway methods and parameters to the greatest possible self-supporting ability to play rock, is to improve the stability of the important roadway guaranteed. Stable internal stress field in the range of small pillar supporting roadway layout, can significantly improve the surrounding rock stress state, greatly improving the recovery rate. Through theoretical analysis, numerical simulation and field measurement methods such as, for layering under thick seam gob roadway layout small pillar of different designs, through analyzing and comparing the stress and strain and displacement of pillars to determine the thick coal seam under the sub-layer along gob roadway reasonable position and pillar dimensions and overlying strata control techniques, and get engineering validation is accurate and reliable, Thus little thick seam mining technology provides an important scientific basis.