Optimization on Mine Gateway Support Plan in Seams Group Based on Geostress Measurement

According to the insufficient basic parameters of the mine gateway support in contiguous seams group of Guandi Mine and the gateway support design with less basis,a geostress measuring device with a small diameter hydraulic fracturing was applied to in-situ stress measurement of eight measuring points in four sea ms and the geostress size and distribution law were mastered. The measured data showed that the geostress field in Guandi Mine was a medium geostress value area, the gravity stress was in a leading position and the direction of the max horizontal main stress was between the north-west and the north-west west direction. According to the geostress measured results,a surrounding rock stability analysis of the gateway was conducted in the No.8 seam and an optimization was conducted on the prev ious support plan. The mine strata pressure monitoring and measuring results showed the bed separation of the surrounding rock in the gateway and the surface displa cement stability could be controlled and could meet the production requirements.