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The determination of reasonable lag time is the key to make the gob-side entry driving away from the violent mining of the working face. In this paper, the geological and mining conditions of the No.7432 Working Face in Kongzhuang Coal Mine is taken as the research background. Using an independently developed infrared acquisition and observation system consisting of a single beam with multi-line and multi-point (stress and deformation) sensors, the long-term and continuous on-line monitoring of the stress and deformation (displacement) change regulation of the lateral coal body in the No.7432 Working Face headentry during the whole process of mining was carried out. The monitoring results demonstrated that it took at least 5 months for the main roof to keep stable, which was the best lag time of the roadway driving along the goaf. The valuable technical experience and practical basis can be provided for the analysis and determination of reasonable lag time for gob-side entry driving in similar conditions, which is of great significance for relaxing the tense prospect of mining and driving continuance, and improving the comprehensive benefits of the coal mine. Keywords—mining engineering, gob-side entry driving, lateral coal body, stress and deformation, on-line monitoring, reasonable lag time

Research on Reasonable Lag Time of Gob-side Entry Driving in Deep Mine Based on On-line Monitoring of Lateral Stress and Deformation of Working Face