水旱交接处护巷煤柱冲击矿压控制

在水采工作面和旱采工作面交接的护巷煤柱处,极易发生冲击矿压事故.通过对冲击矿压机理的分析,认为冲击矿压的发生是由于积聚较高能量的受载煤体裂纹不稳定扩展所致.提出了增加卸载区的范围,促使煤体裂纹稳定扩展,降低单位煤体储能,从而控制冲击矿压发生的原理.给出了该条件下增加煤体孔隙率,减少瓦斯、空气流通通道的防治原则.在此基础上,给出了分段治理,注水和注浆相结合的防治方案.工程实践证明该方案是切实有效的.

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.