Research on Segment Coal Pillar Width Based on Rock Burst Prevention in Shaanxi-Inner Mongolia Deep Mines

Abstract

On the basis of the first gob-side working face mining under the condition of rapid excavation of double roadways in Nariin Gol No.2 coal mine of Shaanxi-Inner Mongolia deep mining areas, the stress distribution law of segment coal pillars with different widths was explored through theoretical analysis, numerical simulation, and field monitoring, then the rock burst mechanism induced by the stress superposition of wide segment coal pillar was revealed, and finally the design method of narrow segment coal pillar width based on rock burst prevention in the next stage was put forward. The results show that the wide segment coal pillar was influenced by the lateral abutment pressure, strike abutment pressure, and dynamic load stress caused by the fracture of overlying thick and hard rock strata. When the superimposed stress reaches the critical stress, rock burst would come out. In the next stage, the reasonable width of segment coal pillar in Nariin Gol No.2 coal mine should be 5~7 m. Other mines with similar conditions in deep mining areas of Shaanxi-Inner Mongolia can actively explore the design methods of narrow coal pillars to reduce the rock burst disaster in gob-side entry.

Keywords

• deep mining
• gob-side
• segment pillar
• stress evolution
• rock burst prevention