Characteristic and prevention research on rock burst of thin coal seam

Abstract：Statistically analyzed the characteristics of the strength, location, and inducing factors of the thin coal seam rock bursts in Taoshan Coal Mine, and experimentally studied the relationship between uniaxial comprehensive strength and burst energy index with height ratio of coal and rock of coal-rock compound samples, and analyzed mechanism and the stress distribution and transference of rock burst in thin coal seam, and finally discussed the prevention techniques. The results indicate that the strength of rock bursts in thin coal seam are small, and mainly taking place on mining face about 5 m besides the upper end of the mining face,and the dynamic load sources of blasting or coal cutting are the main inducing factors;the uniaxial comprehensive strength and the burst energy index both increase linearly with the decrease of height ratio of coal and rock of coal-rock compound samples;and the stress transference of the vertical stress increasing and the horizontal stress abrupt decreasing in peak stress zone made by stress release blasting or coal cutting directly causes the happening of rock bursts;and the prevention techniques of rock bursts in thin coal seam could mainly be taken to make the peak stress zone transfer deep into the coal body, such as deep-hole stress release blasting, so as to release the disturbance to the peak stress zone.