Support Technology of Passing Through Empty Roadway Group and Mine Pressure Characteristics Analysis

In order to improve the recovery rate of coal resources, theoretical analysis was carried out on the reasonable support of coal pillars between the retracting passage and the main roadway in the west plate area of 12# coal in Ulan Mulun Coal Mine, and the support method of many empty roadways in 12404-1 working face was designed. The results show that: the pumping pillar plays a decisive role in the stability of the roadway in the later period of face mining, ensuring the maximum recovery of coal resources at the edge and corner. The working face should be pushed through reasonably and quickly to shorten the effect time of peak pressure on the roadway; the influence area of the leading abutment pressure peak and the roof support state determine the pumping pillar;