Research on the Retention of Small Coal Pillars in Goaf Excavation Along the Fully Mechanized Mining Face

In order to solve the problems of coal pillar retention and closure in the fully mechanized mining face, this paper takes the 208 fully mechanized mining face of Daning Coal Mine as the prototype, and studies the width of small coal pillars left in the goaf of the 208 fully mechanized mining face of Daning Coal Mine through a combination of theoretical analysis and numerical simulation. The minimum size of coal pillars in each section is about 2.8-5.0m; By using FLAC 3D numerical simulation software to simulate and analyze the numerical values of different coal pillar settings, it was finally concluded that setting a 6m coal pillar resulted in the most stable bearing structure of the roadway itself.