关键词: 坚硬顶板, 综采工作面, 深孔爆破, 强制放顶, 顶板来压

Abstract: Taking the 4304 working face of Changping Mine as the engineering background, the numerical simulation was used to analyze the roof collapse and the distribution of mine pressure with the working face. It is estimated that the initial pressure step of the working face is 37 m, and there is a large area of roof. And suddenly the problem of falling. Using the advanced deep hole loose blasting technology, the top surface of the working face is weakened. The results show that after the blasting treatment, the average stepping distance of the direct top of the 4304 working face is 15.4 m, which is smaller than the simulation result; the basic top is presented along the working surface. The characteristics of the section pressure are the largest in the working face; during the initial mining period, no obvious pressure phenomenon such as coal seams and coal cannons are observed, and there is no problem of gas overrun in the return air passage. the existence of the lava collapse column on the working face and the weakening effect of the blasting are factors that weaken the mine pressure on the working face. The existence of the lava collapse column in the working face and the weakening effect of the blasting are factors that weaken the mining pressure on the working face.