Controlling of rock burst in chain pillars between hydraulic mining face and drying mining face

Rock burst was easily happened at chain pillars face. According to the mechanism analysis of rock burst, the between hydraulic mining face and drying mining cracks in the loaded coal mass under the condition of high-energy unstable development would lead to rock burst happening, and would bring forward controlling principle of rock burst that impel crack in coal mass to develop stably and decease energy storied in unit coal mass by lengthening the unloaded area, for controlling of the rock burst at chain pillar between hydraulic mining face and drying mining face. Under this condition, the preventive measure was increasing the porosity of coal mass and deceasing the circulating channels of gas and air. Based on the principle, the preventive scheme was put forward by stage and combining water infusion with grouting. Project practice proved that the scheme was effective.