Surrounding Rock Control Technology of Narrow Coal Pillar Gob-side Entry Driving Under Dynamic Pressure

Taking the impact of the dynamic pressure of the adjacent working face during the tunneling of 31104 working face in Huxi Coal Mine as studying background, the reasonable width of narrow pillar is 5 m by means of theoretical analysis and numerical simulation, and we propose the support scheme of strengthening the narrow pillar side of the roadway by taking the “high-strength pre-stressing yield anchor + pre-stressed anchor cable” as the core. Site monitoring shows that under the influence of dynamic pressure, the maximum deformation of roadway surrounding rock is less than 300 mm, the maximum force of bolt is 165 kN, and the maximum stress of surrounding rock is about 5 MPa, there is no stress concentration phenomenon, which effectively controls the dynamic pressure roadway under the heaving floor and asymmetric deformation and ensures high production and efficient production of coal mine.