Research on On-line Monitoring of Lateral Coal Stress and Deformation and Reasonable Delay Time of Gob-side Entry Driving in Deep Mine

The determination of reasonable delaying roadway driving time is critical to fundamentally avoid the impact of mining roadway on the working face. Based on the geological and mining technical conditions of 7432 working face of Kongzhuang Coal Mine, the infrared acquisition observation system consisting of one beam, multi-line, multiple(stress and deformation) sensors was adopted, and the 7432 working surface was transported smoothly. The long-term continuous on-line monitoring of the stress and deformation(displacement) of the lateral coal body before and after mining(especially after mining) was performed. The monitoring results show that after the working face is recovered. The basic top is swung down until it touches. The stable time is at least 5 months. This is the optimal lag time for roadway driving along the roadway.