关键词: 定向爆破, 沿空留巷, 巷道围岩, D型聚能管, 动压

Abstract: In order to solve the problem that the hard roof of coal seam in Pingmei No.2 Coal Mine makes it difficult to control the surrounding rock of the mining roadway, the directional fracture blasting technology of D-shaped energy-accumulating tube is applied in the gob-side retaining roadway. Through theoretical analysis of the technical principle of directional fracture blasting, field test and borehole peep, the positive effect of D-shaped energy-accumulating tube directional fracture blasting technology on controlling the deformation of surrounding rock of gob-side retaining roadway is The reasonable blasting and charging parameters in the gob-side retaining roadway of Pingmei No. 2 Coal Mine were determined, and the field industrial test was carried out. The test results show that the directional blasting can be achieved by using D-shaped shaped shaped energy-accumulating tube directional fracture blasting technology. The effect of roof pre-splitting is good, the basic roof in gob-side retaining roadway can be effectively cut off, the bearing capacity of roadway itself can be improved, the stability of surrounding rock can be guaranteed during the period of dynamic pressure influence, and the reliability and safety degree of support for gob-side retaining roadway can be significantly improved, which is beneficial to Full production has certain engineering reference value for the selection of parameters of pre-splitting blasting under similar conditions.