Stability Research On Rock-mass Of Dynamic Roadway In Steeply Thick Coal Seams

Rock-mass stability of roadway with sectional top-coal caving is one of prerequisite tosafety excavation in steeply coal seams.According to+501roadway in Wudong colliery， belongs to Shen Hua-Xinjiang EnergyCor. Ltd， the research was carried out to analyze the dynamical and evolutional rule insteeply thick coal seam. Through rock mechanics experiments and numerical simulation，stress distribution of rock-mass and instability mechanism with different advancing amountwere gotten. Based on site monitoring， a comprehensive monitor system and preventionprogram， aiming at rock-brust，were proposed.It was obviously that the roadway rock-mass in disturbed zone occurred high injurydegree and large deformation of top-coal caving of steeply thick coal seam. Because ofInhomogeneity of overburden movement and stress distribution， roadway appeared a cleartendency and roof borne a higher stress， coMPared with floor， during the excavation ofsteeply thick coal seam. Stress concentration region ranged from1660-1720m and1643-1702m was ensured and needed to be taken more consideration. While， a specificpressure control measures including water softening， drilling relief， additional support wasproposed.According to the comprehensive monitoring system and controlling system in steeplythick coal seam， roadway safety was successfully insured during excavation. thus thismonitoring and controlling system could been spread in other mines with similar condition.